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Molecules, Volume 4, Issue 10 (October 1999), Pages 264-319, Articles M103-M115

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Research

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Open AccessArticle Fluorescent 2,7-Dialkylamino-[1,8]-Naphthyridines: Preparation and Spectroscopic Properties
Molecules 1999, 4(10), 264-271; doi:10.3390/41000264
Received: 4 June 1999 / Accepted: 10 August 1999 / Published: 6 September 1999
Cited by 12 | PDF Full-text (74 KB)
Abstract
Substitution of 4-methyl-[1,8]-naphthyridine in 2 and 7 position by alkylamines leads to highly fluorescent compounds. The arrangement of hydrogen donor and acceptor groups of these naphthyridines allows interactions with guanine and guanine cytosine base pairs. The described synthesis offers easy access to these
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Substitution of 4-methyl-[1,8]-naphthyridine in 2 and 7 position by alkylamines leads to highly fluorescent compounds. The arrangement of hydrogen donor and acceptor groups of these naphthyridines allows interactions with guanine and guanine cytosine base pairs. The described synthesis offers easy access to these small and stable fluorescent probes. Full article
Open AccessArticle Stereoselective Transformation of Cyclodecene-1,4-dione Systems, Derived from Steroids, to the Corresponding spiro-γ-lactones. A Semiempirical MO Study
Molecules 1999, 4(10), 272-278; doi:10.3390/41000272
Received: 21 June 1999 / Accepted: 20 July 1999 / Published: 12 September 1999
Cited by 2 | PDF Full-text (42 KB)
Abstract
The thermal and acid-catalyzed intramolecular rearrangement of the (Z)- and (E)-cyclodecene-1,4-dione compounds deriving from steroids, 2a,b and 3a,b, respectively, proceeds stereoselectively to give the corresponding configurationally different spiro-γ-lactone derivatives, the (5R,9R)-isomers 4a,b (from the (Z)-cyclodecenediones 2a,b) and the (5R,9S)-isomers 5a,b (from the (E)-cyclodecenediones
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The thermal and acid-catalyzed intramolecular rearrangement of the (Z)- and (E)-cyclodecene-1,4-dione compounds deriving from steroids, 2a,b and 3a,b, respectively, proceeds stereoselectively to give the corresponding configurationally different spiro-γ-lactone derivatives, the (5R,9R)-isomers 4a,b (from the (Z)-cyclodecenediones 2a,b) and the (5R,9S)-isomers 5a,b (from the (E)-cyclodecenediones 3a,b). The semiempirical MNDOAM1 and PM3 molecular orbital methods were applied to elucidate the possible mechanistic pathway of the observed intramolecular process leading to the spiro-γ-lactone structures. Full article
Open AccessArticle Synthetical Application of Alkyl 2-isothiocyanatocarboxylates. A Simple Synthesis of 5-Substituted-3-amino-2-thioxo-4-imidazolidinones (3-Amino-2-thiohydantoins)
Molecules 1999, 4(10), 279-286; doi:10.3390/41000279
Received: 20 August 1999 / Accepted: 7 September 1999 / Published: 22 September 1999
PDF Full-text (46 KB)
Abstract The title 3-amino-2-thiohydantoins 3 has been prepared in very good yields by the reaction of alkyl isothiocynatocarboxylates 1 with hydrazine hydrate.The synthesis of starting isothiocyanates as well as spectral data of 3-aminothiohydantoins and alkyl isothiocyanatocarboxylates has been presented. Full article
Open AccessArticle Synthesis of N-7-Substituted Purines from Imidazole Precursors
Molecules 1999, 4(10), 287-309; doi:10.3390/41000287
Received: 23 February 1999 / Accepted: 4 June 1999 / Published: 25 September 1999
Cited by 7 | PDF Full-text (136 KB)
Abstract
Synthesis of purines and purine mono-1-oxides from the respective 5-substituted 4-nitroimidazole derivatives is described. The commercially available 4-nitroimidazole, in a few simple steps (including Vicarious Nucleophilic Substitution of Hydrogen), was transformed into: 4-aminoimidazoyl-5-carboximes, N-[1-(4-amino-1H-imidazol-5-yl)methylidene]-N-(aryl)amine derivatives or into 4-amino-5-aminomethyl-imidazole.
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Synthesis of purines and purine mono-1-oxides from the respective 5-substituted 4-nitroimidazole derivatives is described. The commercially available 4-nitroimidazole, in a few simple steps (including Vicarious Nucleophilic Substitution of Hydrogen), was transformed into: 4-aminoimidazoyl-5-carboximes, N-[1-(4-amino-1H-imidazol-5-yl)methylidene]-N-(aryl)amine derivatives or into 4-amino-5-aminomethyl-imidazole. These intermediates were cyclized to the final products. Full article
Open AccessArticle Trimethylcyanosilane as a Convenient Reagent for the Preparation of Trimethylsilyl Enol Ethers of 1,3-Diketones
Molecules 1999, 4(10), 310-315; doi:10.3390/41000310
Received: 22 August 1999 / Accepted: 12 September 1999 / Published: 10 October 1999
PDF Full-text (31 KB)
Abstract Trimethylsilyl enol ethers of 1,3-diketones are generated “in situ” or obtained in high isolated yield by the reaction of 1,3-diketones with trimethylcyanosilane in various solvents such as cyclohexane, hexane, benzene, methylene chloride, chloroform, carbon tetrachloride, and acetonitrile. Full article

Other

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Open AccessShort Note 4-Carboxylphenyl Methylphosphonate
Molecules 1999, 4(10), M103; doi:10.3390/M103
Received: 18 August 1999 / Accepted: 28 August 1999 / Published: 8 October 1999
PDF Full-text (91 KB) | Supplementary Files
(This article belongs to the Section Molbank Section of Molecules, 1997-2001)
Open AccessShort Note Synthesis of (4R,5R)-2-Ethoxy-4,5-bis[(1-methoxy-1-methyl)ethyl]-1,3-dioxolane
Molecules 1999, 4(10), M104; doi:10.3390/M104
Received: 28 August 1999 / Accepted: 7 September 1999 / Published: 8 October 1999
PDF Full-text (88 KB) | Supplementary Files
(This article belongs to the Section Molbank Section of Molecules, 1997-2001)
Open AccessShort Note 2-Amino-4,10-dimethylpyrrolo[3,4-b]carbazole-1,3(2H,5H)-dione
Molecules 1999, 4(10), M105; doi:10.3390/M105
Received: 28 August 1998 / Accepted: 1 September 1999 / Published: 8 October 1999
Cited by 1 | PDF Full-text (92 KB) | Supplementary Files
(This article belongs to the Section Molbank Section of Molecules, 1997-2001)
Open AccessShort Note Ethyl N-(3-Phenyl-2-propynoyl)carbamate
Molecules 1999, 4(10), M106; doi:10.3390/M106
Received: 28 August 1999 / Accepted: 2 September 1999 / Published: 8 October 1999
PDF Full-text (94 KB) | Supplementary Files
(This article belongs to the Section Molbank Section of Molecules, 1997-2001)
Open AccessShort Note N-(3-Phenyl-2-propinoyl)benzamide
Molecules 1999, 4(10), M107; doi:10.3390/M107
Received: 28 August 1999 / Accepted: 2 September 1999 / Published: 8 October 1999
PDF Full-text (91 KB) | Supplementary Files
(This article belongs to the Section Molbank Section of Molecules, 1997-2001)
Open AccessShort Note 4-(2,4-Dimethoxybenzyliden)-2-butenolide
Molecules 1999, 4(10), M108; doi:10.3390/M108
Received: 25 August 1999 / Accepted: 8 September 1999 / Published: 8 October 1999
PDF Full-text (92 KB) | Supplementary Files
(This article belongs to the Section Molbank Section of Molecules, 1997-2001)
Open AccessShort Note 4-[5-(4-methylphenyl)-2-furfuryl]iden-2-butenolide
Molecules 1999, 4(10), M109; doi:10.3390/M109
Received: 25 August 1999 / Accepted: 8 September 1999 / Published: 8 October 1999
PDF Full-text (91 KB) | Supplementary Files
(This article belongs to the Section Molbank Section of Molecules, 1997-2001)
Open AccessShort Note 4,5-Dimethoxy-2-nitrobenzophenone
Molecules 1999, 4(10), M110; doi:10.3390/M110
Received: 13 September 1999 / Accepted: 20 September 1999 / Published: 8 October 1999
PDF Full-text (85 KB) | Supplementary Files
(This article belongs to the Section Molbank Section of Molecules, 1997-2001)
Open AccessShort Note 4,5-Dimethoxy-2-nitroacetophenone
Molecules 1999, 4(10), M111; doi:10.3390/M111
Received: 13 September 1999 / Accepted: 20 September 1999 / Published: 8 October 1999
PDF Full-text (84 KB) | Supplementary Files
(This article belongs to the Section Molbank Section of Molecules, 1997-2001)
Open AccessShort Note 1-(4,5-Dimethoxy-2-nitrophenyl)ethanol
Molecules 1999, 4(10), M112; doi:10.3390/M112
Received: 13 September 1999 / Accepted: 20 September 1999 / Published: 8 October 1999
PDF Full-text (85 KB) | Supplementary Files
(This article belongs to the Section Molbank Section of Molecules, 1997-2001)
Open AccessShort Note 4,5-Dimethoxy-2-nitrobenzhydrol
Molecules 1999, 4(10), M113; doi:10.3390/M113
Received: 13 September 1999 / Accepted: 20 September 1999 / Published: 8 October 1999
PDF Full-text (85 KB) | Supplementary Files
(This article belongs to the Section Molbank Section of Molecules, 1997-2001)
Open AccessShort Note 3,5-Bis[5-(4-tert-butylphenyl)-1,3,4-oxadiazol-2-yl]nitrobenzene
Molecules 1999, 4(10), M114; doi:10.3390/M114
Received: 15 September 1999 / Accepted: 15 September 1999 / Published: 8 October 1999
PDF Full-text (92 KB) | Supplementary Files
Open AccessShort Note 3,5-Bis[5-(4-tert-butylphenyl)-1,3,4-oxadiazol-2-yl]benzenamine
Molecules 1999, 4(10), M115; doi:10.3390/M115
Received: 15 September 1999 / Accepted: 15 September 1999 / Published: 8 October 1999
PDF Full-text (94 KB) | Supplementary Files
(This article belongs to the Section Molbank Section of Molecules, 1997-2001)
Open AccessBook Review Organic Chemistry: Structure and Function. By K. Peter C. Vollhardt
Molecules 1999, 4(10), 316-317; doi:10.3390/41000316
Received: 30 September 1999 / Published: 31 October 1999
PDF Full-text (6 KB)
Open AccessBook Review The Weak Hydrogen Bond: Applications to Structural Chemistry and Biology(International Union of Crystallography Monographs on Crystallography, 9). By Gautam R. Desiraju
Molecules 1999, 4(10), 318-319; doi:10.3390/41000318
Received: 7 September 1999 / Published: 31 October 1999
PDF Full-text (9 KB)

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