Molbank

6 pages, 733 KB

Open AccessShort Note

(E)-Methyl 3-(2-amino-4-chloro-6-morpholinopyrimidin-5-yl)acrylate

by Jorge Trilleras, Efraín Polo-Cuadrado and Jairo Quiroga

Molbank 2026, 2026(1), M2141; https://doi.org/10.3390/M2141 - 16 Feb 2026

The synthesis of methyl (E)-3-(2-amino-4-chloro-6-morpholinopyrimidin-5-yl)acrylate 3 was accomplished using a Schlosser-modified Wittig reaction. Complete ¹H and ¹³C NMR signal assignments confirm the formation of E-alkene. Full article

(This article belongs to the Collection Heterocycle Reactions)

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8 pages, 476 KB

Open AccessShort Note

(5R,5aR,8aR,9S)-9-(2-Bromo-3,4,5-trimethoxyphenyl)-8-oxo-5,5a,6,8,8a,9-hexahydrofuro[3′,4′:6,7]naphtho[2,3-d][1,3]dioxol-5-yl 3,4,5-trimethoxybenzoate

by Yuhan Xie, Alessandra Gianoncelli, Imran Khan, Giovanni Ribaudo and Paolo Coghi

Molbank 2026, 2026(1), M2140; https://doi.org/10.3390/M2140 - 13 Feb 2026

Abstract

In this report, we describe the synthesis and full spectroscopic characterization of a previously unreported podophyllotoxin (PTOX) analogue bearing a second 3,4,5-trimethoxyphenyl (TMP) unit at the C-4 position through an ester linkage. This dual-TMP PTOX derivative is obtained from a brominated PTOX intermediate. [...] Read more.

In this report, we describe the synthesis and full spectroscopic characterization of a previously unreported podophyllotoxin (PTOX) analogue bearing a second 3,4,5-trimethoxyphenyl (TMP) unit at the C-4 position through an ester linkage. This dual-TMP PTOX derivative is obtained from a brominated PTOX intermediate. In this precursor, the bromine atom is located on the TMP aromatic ring at the 2′-position. The new compound was fully characterized by proton (¹H), carbon-13 (¹³C), heteronuclear single-quantum coherence (HSQC), and distortionless enhancement by polarization transfer (DEPT) NMR spectroscopy. Ultraviolet–visible (UV-Vis) spectroscopy, Fourier-transform infrared (FTIR) spectroscopy, mass spectrometry and elemental analysis were also performed to confirm the structure and purity of the synthesized ester derivative. Full article

(This article belongs to the Section Organic Synthesis and Biosynthesis)

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6 pages, 892 KB

Open AccessShort Note

Diisopropyl(6-(phenyl(phenylthio)arsaneyl)-1,2-dihydroacenaphthylen-5-yl)phosphane

by Laurence J. Taylor, Philip Pickett, David B. Cordes and Petr Kilian

Molbank 2026, 2026(1), M2139; https://doi.org/10.3390/M2139 - 10 Feb 2026

Abstract

Peri-substituted bis(tertiary) phosphine-arsine Acenap(PiPr₂)(As(SPh)Ph) (4, Acenap = acenaphthene-5,6-diyl) was synthesized by the reaction of the chloroarsine (PiPr₂)(AsPhCl) with PhSLi. The X-ray crystal structure of this compound reveals an intramolecular P∙∙∙As–Cl pnictogen bond, with [...] Read more.

Peri-substituted bis(tertiary) phosphine-arsine Acenap(PiPr₂)(As(SPh)Ph) (4, Acenap = acenaphthene-5,6-diyl) was synthesized by the reaction of the chloroarsine (PiPr₂)(AsPhCl) with PhSLi. The X-ray crystal structure of this compound reveals an intramolecular P∙∙∙As–Cl pnictogen bond, with the phosphorus lone pair donating into the As–S σ* orbital. Full article

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6 pages, 861 KB

Open AccessCommunication

Crystal Structure of [1046127-79-0], 3,3′-(n-Hexane-1,6-diyl)bis(1-vinylimidazolium) Bromide

by Thomas Gelbrich, Johanna Freilinger, Gabriel Partl, Herwig Schottenberger, Volker Kahlenberg, Jan Back and Sven Nerdinger

Molbank 2026, 2026(1), M2138; https://doi.org/10.3390/M2138 - 10 Feb 2026

Abstract

Vinylimidazolium salts constitute a highly relevant class of polymerizable heterocycles, especially in the field of so-called polymer ionic liquids (PILs), and they are frequently used as components of polyelectrolytes. Therefore, crystallographic characterizations, in particular studies of charge distribution and conformational features, can provide [...] Read more.

Vinylimidazolium salts constitute a highly relevant class of polymerizable heterocycles, especially in the field of so-called polymer ionic liquids (PILs), and they are frequently used as components of polyelectrolytes. Therefore, crystallographic characterizations, in particular studies of charge distribution and conformational features, can provide fundamental insights concerning ion–ion and ion–dipole interactions. The structure of the title compound [1046127-79-0] has the space group symmetry P2₁/c. Its asymmetric unit contains one formula unit, consisting of two bromide anions and the halves of two cation moieties. The cation units possess inversion symmetry, and their C₆H₁₂ chains adopt an all-trans conformation. Full article

(This article belongs to the Section Structure Determination)

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Graphical abstract

6 pages, 727 KB

Open AccessShort Note

(2R,3R,5R,6S)-5-Bromo-2-{[(2R,3R,5R)-3-bromo-5-(propa-1,2-dien-1-yl)tetrahydro-furan-2-yl]methyl}-6-ethyltetrahydro-2H-pyran-3-ol

by Vincenzo Piccialli, Nicola Borbone and Monica Terracciano

Molbank 2026, 2026(1), M2137; https://doi.org/10.3390/M2137 - 9 Feb 2026

Abstract

As a part of an SAR study aimed at testing the antitumor activity of some C₁₅ acetogenins related to mycalin A, we report here the synthesis of the C-1 debromo-derivative of laurenciallene, a substance recently isolated from the red alga Laurencia obtusa [...] Read more.

As a part of an SAR study aimed at testing the antitumor activity of some C₁₅ acetogenins related to mycalin A, we report here the synthesis of the C-1 debromo-derivative of laurenciallene, a substance recently isolated from the red alga Laurencia obtusa. This new substance has been obtained by the selective, reductive debromination of the terminal bromoallene moiety of laurenciallene with Zn/AcOH. Its structure has been fully characterized by spectral methods, including 2D-NMR spectra. Full article

(This article belongs to the Section Organic Synthesis and Biosynthesis)

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Graphical abstract

6 pages, 803 KB

Open AccessCommunication

Synthesis and Characteristics of New 3-(Dichloromethyl)-2-nitro-6,7-dihydro-1-benzofuran-4(5H)-ones

by Ilia A. Pilipenko, Olga Yu. Ozerova, Oleg P. Demidov, Ruslan I. Baichurin, Oussama A. Mammeri and Sergey V. Makarenko

Molbank 2026, 2026(1), M2134; https://doi.org/10.3390/M2134 - 6 Feb 2026

Abstract

The previously unknown compounds—3-(dichloromethyl)-2-nitro-6,7-dihydro-1-benzofuran-4(5H)-ones—have been synthesized and structurally characterized via single-crystal X-ray diffraction, ¹H, ¹³C–{¹H}, ¹H–¹³C HMQC and ¹H–¹³C HMBC NMR spectroscopy, IR, and UV spectroscopy. Full article

(This article belongs to the Section Structure Determination)

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Graphical abstract

9 pages, 2244 KB

Open AccessShort Note

2-Iodopyridin-3-yl acetate

by Mihaela Cristea, Sergiu Shova, Marcel Mirel Popa and Florea Dumitrascu

Molbank 2026, 2026(1), M2135; https://doi.org/10.3390/M2135 - 6 Feb 2026

Abstract

The title compound 2-iodopyridin-3-yl acetate was obtained by acetylation of the OH group of 2-iodo-3-hydroxypyridine. Knowing that the hydroxyl group, as a strong H-bond donor in halogenated hydroxypyridines, usually directs supramolecular packing and might enforce possible halogen–halogen contacts, we crystallized 2-iodo-3-acetoxypyridine with the [...] Read more.

The title compound 2-iodopyridin-3-yl acetate was obtained by acetylation of the OH group of 2-iodo-3-hydroxypyridine. Knowing that the hydroxyl group, as a strong H-bond donor in halogenated hydroxypyridines, usually directs supramolecular packing and might enforce possible halogen–halogen contacts, we crystallized 2-iodo-3-acetoxypyridine with the aim of disrupting the most important H-bond donor and assessing the propensity of the iodine for halogen bond formation. Indeed, in the compound 2-iodopyridin-3-yl acetate, the crystal packing is characterized by infinite 3D chains bonded through I···O=C and C-H···I contacts between adjacent molecules. These chains are interconnected by weak C-H···O contacts, implying the presence of oxygen in the ester. The I···H contact with the C-H axis perpendicular to the electron belt of the iodine atom can enhance the σ-hole of the iodine and act cooperatively in crystal cohesion. No halogen–halogen contacts were present. Full article

(This article belongs to the Section Structure Determination)

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Graphical abstract

8 pages, 1859 KB

Open AccessShort Note

2,3,4,6-Tetra(9H-carbazol-9-yl)benzonitrile

by Qing-Qing Wan and Zhi-Cheng Fu

Molbank 2026, 2026(1), M2136; https://doi.org/10.3390/M2136 - 6 Feb 2026

Abstract

Here, we synthesized 2,3,4,6-tetra(9H-carbazol-9-yl)benzonitrile (4CzHPN) via visible-light-driven photocatalytic monodecyanation using the versatile metal-free catalyst 4CzIPN. Characterized by NMR, IR, X-ray diffraction, and DFT calculations, it features a 3.49 eV HOMO-LUMO gap and shows blue-shifted absorption/emission, emerging as a promising advanced metal-free [...] Read more.

Here, we synthesized 2,3,4,6-tetra(9H-carbazol-9-yl)benzonitrile (4CzHPN) via visible-light-driven photocatalytic monodecyanation using the versatile metal-free catalyst 4CzIPN. Characterized by NMR, IR, X-ray diffraction, and DFT calculations, it features a 3.49 eV HOMO-LUMO gap and shows blue-shifted absorption/emission, emerging as a promising advanced metal-free photoredox catalyst. Full article

(This article belongs to the Section Structure Determination)

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6 pages, 307 KB

Open AccessShort Note

N-(4-Methoxyphenethyl)-2-propylpentanamide

by Diyana Dimitrova, Tsvetelina Marinova, Reni Bozhanova, Iliyan Ivanov, Dimitar Bojilov, Gabriel Marc and Stanimir Manolov

Molbank 2026, 2026(1), M2132; https://doi.org/10.3390/M2132 - 4 Feb 2026

Abstract

Herein, we report the mechanochemical synthesis of a novel hybrid molecule, N-(4-methoxyphenethyl)-2-propylpentanamide. This solvent-minimized synthesis aligns with the principles of Green Chemistry and exemplifies the emerging paradigm of medicinal mechanochemistry, offering an efficient, sustainable route to pharmaceutically relevant amides. The newly synthesized [...] Read more.

Herein, we report the mechanochemical synthesis of a novel hybrid molecule, N-(4-methoxyphenethyl)-2-propylpentanamide. This solvent-minimized synthesis aligns with the principles of Green Chemistry and exemplifies the emerging paradigm of medicinal mechanochemistry, offering an efficient, sustainable route to pharmaceutically relevant amides. The newly synthesized compound was fully characterized by melting point determination, ¹H and ¹³C NMR spectroscopy, infrared (IR) spectroscopy, and mass spectrometry. Full article

(This article belongs to the Section Structure Determination)

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5 pages, 256 KB

Open AccessShort Note

2-(3′,5′-Bis((dodecyloxy)carbonyl)-2′,6′-dimethyl-1′,4′-dihydro-[3,4′-bipyridin]-1-ium-1-yl)-1,3-dioxo-2,3-dihydro-1H-inden-2-ide

by Mara Plotniece, Krista Arule, Karlis Pajuste, Aiva Plotniece and Arkadij Sobolev

Molbank 2026, 2026(1), M2133; https://doi.org/10.3390/M2133 - 4 Feb 2026

Abstract

Indane-1,3-dione and 1,4-dihydropyridine (1,4-DHP) scaffolds are of significant interest in medicinal chemistry. Herein, we report the synthesis characterization of a new lipid-like indane-1,3-dione–1,4-DHP betaine, 2-(3′,5′-bis((dodecyloxy)carbonyl)-2′,6′-dimethyl-1′,4′-dihydro-[3,4′-bipyridin]-1-ium-1-yl)-1,3-dioxo-2,3-dihydro-1H-inden-2-ide (3). Compound 3 was synthesized from 2,2-dicyanomethylideneindan-1,3-dione (1) oxide and a didodecyl-substituted [...] Read more.

Indane-1,3-dione and 1,4-dihydropyridine (1,4-DHP) scaffolds are of significant interest in medicinal chemistry. Herein, we report the synthesis characterization of a new lipid-like indane-1,3-dione–1,4-DHP betaine, 2-(3′,5′-bis((dodecyloxy)carbonyl)-2′,6′-dimethyl-1′,4′-dihydro-[3,4′-bipyridin]-1-ium-1-yl)-1,3-dioxo-2,3-dihydro-1H-inden-2-ide (3). Compound 3 was synthesized from 2,2-dicyanomethylideneindan-1,3-dione (1) oxide and a didodecyl-substituted 1,4-DHP derivative 2 and characterized by UV–Vis spectroscopy, ¹H-NMR, ¹³C-NMR, and HRMS. The obtained results demonstrate a promising strategy for the design of delivery agents, exploiting the lipid-like properties of the synthesized betaine. Full article

(This article belongs to the Collection Heterocycle Reactions)

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Scheme 1

11 pages, 3476 KB

Open AccessCommunication

Molecular Structure of the Monohydrate Hydrochloride Salt of the Antimalarial Drug Chloroquine

by Silvia Rizzato and Massimo Moret

Molbank 2026, 2026(1), M2131; https://doi.org/10.3390/M2131 - 3 Feb 2026

Abstract

We report the crystallization and single-crystal X-ray analysis of the monohydrate hydrochloride salt of chloroquine(CQ), abbreviated CQHCl·H₂O, an antimalarial drug with the formula C₁₈H₂₆ClN₃. The crystal structure reveals a well-defined supramolecular architecture stabilized by [...] Read more.

We report the crystallization and single-crystal X-ray analysis of the monohydrate hydrochloride salt of chloroquine(CQ), abbreviated CQHCl·H₂O, an antimalarial drug with the formula C₁₈H₂₆ClN₃. The crystal structure reveals a well-defined supramolecular architecture stabilized by an extensive hydrogen-bonding network involving CQH⁺ cations, chloride anions, and water molecules. Notably, this study provides the first crystallographic characterization of a monoprotonated chloroquine salt. Additionally, our findings demonstrate the feasibility of isolating pseudo-polymorphic forms of a commercially available CQ salt via heterogeneous crystallization. Full article

(This article belongs to the Section Structure Determination)

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Graphical abstract

8 pages, 1098 KB

Open AccessShort Note

(2RS,3aRS,9aRS)-3a-Methyl-2-phenyl-3,3a,9,9a-tetrahydro-1H-benzo[f]indol-4(2H)-one Hydrobromide

by Denis A. Tiunov, Victor A. Tafeenko and Alexander V. Kurkin

Molbank 2026, 2026(1), M2130; https://doi.org/10.3390/M2130 - 2 Feb 2026

Abstract

(2RS,3aRS,9aRS)-3a-methyl-2-phenyl-3,3a,9,9a-tetrahydro-1H-benzo[f]indol-4(2H)-one hydrobromide was first synthesized via a tandem aza-Cope rearrangement and Mannich reaction from (1RS,2SR)-2-amino-1-(prop-1-en-2-yl)-2,3-dihydro-1H-inden-1-ol, which, in turn, was obtained in four steps from commercially available 2,3-dihydro-1 [...] Read more.

(2RS,3aRS,9aRS)-3a-methyl-2-phenyl-3,3a,9,9a-tetrahydro-1H-benzo[f]indol-4(2H)-one hydrobromide was first synthesized via a tandem aza-Cope rearrangement and Mannich reaction from (1RS,2SR)-2-amino-1-(prop-1-en-2-yl)-2,3-dihydro-1H-inden-1-ol, which, in turn, was obtained in four steps from commercially available 2,3-dihydro-1H-inden-1-one. The molecular and crystal structure features of the new compounds were characterized using NMR spectroscopy (¹H, ¹³C spectra). Full article

(This article belongs to the Collection Heterocycle Reactions)

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9 pages, 1676 KB

Open AccessCommunication

Synthesis of 1-(Naphthalen-2-yl)-3-(3-(triethoxysilyl)propyl)urea and Determination of Its Crystal Structure

by Abderrahim Khatyr, Isabelle Jourdain, Michael Knorr, Carsten Strohmann and Tobias Schrimpf

Molbank 2026, 2026(1), M2129; https://doi.org/10.3390/M2129 - 28 Jan 2026

Abstract

The addition of 3-isocyanatopropyltriethoxysilane and 2-aminonaphthalene in THF affords the title compound 1-(naphthalen-2-yl)-3-(3-(triethoxysilyl)propyl)urea 1. A determination of the crystal structure of this naphthyl urea reveals the occurrence of strong intermolecular N-H···O hydrogen bonds, giving rise to a 1D supramolecular ribbon, whose interactions [...] Read more.

The addition of 3-isocyanatopropyltriethoxysilane and 2-aminonaphthalene in THF affords the title compound 1-(naphthalen-2-yl)-3-(3-(triethoxysilyl)propyl)urea 1. A determination of the crystal structure of this naphthyl urea reveals the occurrence of strong intermolecular N-H···O hydrogen bonds, giving rise to a 1D supramolecular ribbon, whose interactions have also been assessed by a Hirshfeld surface analysis. The propensity of 1 to sense halide ions by intramolecular trapping through N-H···Hal bonding was also investigated by UV-vis spectroscopy and fluorescence measurements. Full article

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4 pages, 512 KB

Open AccessShort Note

2-((6,7-Dimethoxy-4-oxo-3-(4-(trifluoromethyl)phenethyl)-3,4-dihydroquinazolin-2-yl)thio)-N-(4-ethylphenyl)butanamide

by Young Hee Lee and Jae-Kyung Jung

Molbank 2026, 2026(1), M2128; https://doi.org/10.3390/M2128 - 26 Jan 2026

Abstract

2-({3-[2-(1-cyclohexen-1-yl)ethyl]-6,7-dimethoxy-4-oxo-3,4-dihydro-2-quinazolinyl}sulfanyl)-N-(4-ethylphenyl)butanamide (K284-6111; K284), the representative CHI3L1 inhibitor, has interesting biological activities, including anti-cancer and anti-inflammatory effects on neuroinflammation. Following our hit-to-lead program, we report the most active novel derivative, named CBJL-025, 2-((6,7-dimethoxy-4-oxo-3-(4-(trifluoromethyl)phenethyl)-3,4-dihydroquinazolin-2-yl)thio)-N-(4-ethylphenyl)butanamide. The title compound, CBJL-025, was successfully synthesized by S [...] Read more.

2-({3-[2-(1-cyclohexen-1-yl)ethyl]-6,7-dimethoxy-4-oxo-3,4-dihydro-2-quinazolinyl}sulfanyl)-N-(4-ethylphenyl)butanamide (K284-6111; K284), the representative CHI3L1 inhibitor, has interesting biological activities, including anti-cancer and anti-inflammatory effects on neuroinflammation. Following our hit-to-lead program, we report the most active novel derivative, named CBJL-025, 2-((6,7-dimethoxy-4-oxo-3-(4-(trifluoromethyl)phenethyl)-3,4-dihydroquinazolin-2-yl)thio)-N-(4-ethylphenyl)butanamide. The title compound, CBJL-025, was successfully synthesized by S-alkylation of the p-trifluoromethyl phenethyl group possessing quinazoline and the corresponding bromide. The structure of CBJL-025 was confirmed by ¹H and ¹³C nuclear magnetic resonance (NMR) and high-resolution mass spectrometry (HRMS). Full article

(This article belongs to the Section Organic Synthesis and Biosynthesis)

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6 pages, 399 KB

Open AccessShort Note

Ethyl 2-(2-((6-Methyl-4-oxo-4H-chromen-3-yl)methylene)hydrazineyl)thiazole-4-carboxylate

by Adriana Grozav, Cristina Azarov, Gabriel Marc, Adrian Pîrnău, Stanimir Manolov, Ovidiu Oniga and Ovidiu Crișan

Molbank 2026, 2026(1), M2127; https://doi.org/10.3390/M2127 - 22 Jan 2026

Abstract

This study presents the synthesis of a new compound, ethyl 2-(2-((6-methyl-4-oxo-4H-chromen-3-yl)methylene)hydrazinyl)thiazole-4-carboxylate, obtained by the Hantzsch heterocyclisation reaction. The compound was analyzed through melting point determination, ¹H and ¹³C NMR spectroscopy, infrared, and UV spectroscopy. Full article

(This article belongs to the Collection Heterocycle Reactions)

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Graphical abstract

10 pages, 2472 KB

Open AccessCommunication

Structural and Electronic Insights into Arylalkanones from Myristica ceylanica

by Navaratnarajah Kuganathan and Tharmarajah Manoranjan

Molbank 2026, 2026(1), M2126; https://doi.org/10.3390/M2126 - 20 Jan 2026

Abstract

A phytochemical investigation of Myristica ceylanica resulted in the identification of seven arylalkanone-derived phenolic compounds, comprising one new naturally occurring arylalkanone (A), two derivatives (A₁ and A₂) prepared by chemical synthesis, and four known malabaricones (B–E). Density functional theory (DFT) [...] Read more.

A phytochemical investigation of Myristica ceylanica resulted in the identification of seven arylalkanone-derived phenolic compounds, comprising one new naturally occurring arylalkanone (A), two derivatives (A₁ and A₂) prepared by chemical synthesis, and four known malabaricones (B–E). Density functional theory (DFT) calculations were conducted to evaluate the geometries, electronic properties, and charge distributions of the newly identified arylalkanone and its derivatives and to compare them with those of malabaricones B–E. The arylalkanones exhibited geometrical features comparable to those of the malabaricones, whereas frontier molecular orbital analysis revealed similar HOMO–LUMO energy gaps for the malabaricones but a progressive widening of the gap among the arylalkanone derivatives, indicating enhanced electronic stabilisation. Mulliken population analysis identified oxygen atoms as the principal electron-rich sites in both series, with arylalkanones displaying greater charge polarisation and increased sensitivity to structural substitution. Full article

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5 pages, 650 KB

Open AccessCommunication

Synthesis of 5′-Chlorospiro(benzo[d][1,3]dioxole-2,4′-[1,2,6]thiadiazin)-3′-amine and 10-Chloro-1,4-dioxa-8-thia-7,9-diazaspiro[4.5]deca-6,9-dien-6-amine

by Andreas S. Kalogirou and Panayiotis A. Koutentis

Molbank 2026, 2026(1), M2125; https://doi.org/10.3390/M2125 - 16 Jan 2026

Abstract

Reactions of 3′,5′-dichlorospiro(benzo[d][1,3]dioxole-2,4′-[1,2,6]thiadiazine) or 6,10-dichloro-1,4-dioxa-8-thia-7,9-diazaspiro[4.5]deca-6,9-diene with ammonia in MeCN, at ca. 20 °C, gave 5′-chlorospiro(benzo[d][1,3]dioxole-2,4′-[1,2,6]thiadiazin)-3′-amine and 10-chloro-1,4-dioxa-8-thia-7,9-diazaspiro[4.5]deca-6,9-dien-6-amine, respectively, in near quantitative yields. Full article

(This article belongs to the Section Organic Synthesis and Biosynthesis)

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5 pages, 260 KB

Open AccessShort Note

Methyl 2-(Chloromethoxy-1-carbonyl)-7-oxabicyclo[2.2.1]heptane-3-carboxylate

by Hannah K. Lawley, Bailey N. Baxter, Caleb N. Lopansri, Mary Helene Marmande, Kathryn N. Mayeaux, Lucy A. Orr and David C. Forbes

Molbank 2026, 2026(1), M2124; https://doi.org/10.3390/M2124 - 13 Jan 2026

Abstract

Overexpression of protein phosphatase 5 (PP5) is implicated in tumor cell growth, establishing PP5 as a compelling target for small-molecule anticancer therapy. Building on prior success in achieving selectivity within the PP2A domain through scaffold functionalization that maximizes active-site interactions, we propose a [...] Read more.

Overexpression of protein phosphatase 5 (PP5) is implicated in tumor cell growth, establishing PP5 as a compelling target for small-molecule anticancer therapy. Building on prior success in achieving selectivity within the PP2A domain through scaffold functionalization that maximizes active-site interactions, we propose a parallel strategy for PP5 inhibition. Norcantharidin, the demethylated cousin of cantharidin, is a potent yet unselective phosphatase inhibitor, making its bicyclic framework an attractive platform for systematic derivatization. The approach reported herein exploits anhydride reactivity to generate a carboxylic acid derivative that is transformed into a chloromethyl ester. Chloromethyl ester functionality serves as a strategically activated intermediate enabling downstream functional-group diversification under mild, neutral conditions while preserving scaffold integrity. This modular synthetic strategy establishes a foundation for the development of PP5-selective norcantharidin derivatives with improved tumor selectivity, potency, and synthetic feasibility. Full article

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Scheme 1

6 pages, 966 KB

Open AccessShort Note

N-(2-(1H-Indol-3-yl)ethyl)-2-propylpentanamide

by Diyana Dimitrova, Iliyan Ivanov, Simona Ilieva, Ivelina Cherneva, Dimitar Bojilov and Stanimir Manolov

Molbank 2026, 2026(1), M2123; https://doi.org/10.3390/M2123 - 9 Jan 2026

Abstract

Herein we describe the synthesis of N-(2-(1H-indol-3-yl)ethyl)-2-propylpentanamide. The compound was comprehensively characterized using melting-point analysis, ¹H and ¹³C NMR spectroscopy, infrared spectroscopy, and mass spectrometry. The collective analytical results confirm the successful synthesis and structural integrity of the target molecule. Full article

(This article belongs to the Section Structure Determination)

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