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Molecules, Volume 7, Issue 7 (July 2002), Pages 507-565

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Research

Open AccessArticle Synthesis of Novel Quinazoline Derivatives via Pyrimidine ortho-Quinodimethane
Molecules 2002, 7(7), 507-510; doi:10.3390/70700507
Received: 24 September 2001 / Revised: 3 July 2002 / Accepted: 8 July 2002 / Published: 31 July 2002
Cited by 3 | PDF Full-text (20 KB) | HTML Full-text | XML Full-text
Abstract The [4+2] cycloaddition between 2,4-diphenylpyrimidine ortho-quinodimethane and dimethyl acetylenedicarboxylate leads to 2,4-diphenylquinazoline-6,7-dicarboxylate (6). 2,4-Diphenylfuro[3,4-g]quinazoline-6,8-dione (7) is also obtained by basic hydrolysis of compound 6, followed by the closure of the resulting diacid in acetic anhydride. Full article
Open AccessArticle Synthetic Studies on Optically Active Schiff-base Ligands Derived from Condensation of 2-Hydroxyacetophenone and Chiral Diamines
Molecules 2002, 7(7), 511-516; doi:10.3390/70700511
Received: 9 April 2002 / Revised: 2 July 2002 / Accepted: 10 July 2002 / Published: 31 July 2002
Cited by 31 | PDF Full-text (36 KB) | HTML Full-text | XML Full-text
Abstract Three optically active Schiff-base ligands have been prepared by condensation of 2-hydroxyacetophenone with (1R,2R)-(-)-1,2-diaminocyclohexane, (1S,2S)-(-)-1,2-diphenylethylenediamine or R-(+)-2,2’-diamino-1,1’-binaphthalene, respectively. The products have been characterized by their IR, 1H- and 13C-NMR spectra. Full article
Open AccessArticle Total Synthesis of (-)-(7S,10R)-Calamenene and (-)-(7S,10R)-2-Hydroxycalamenene by Use of a Ring-Closing Metathesis Reaction. A Comparison of the cis- and trans-Isomers
Molecules 2002, 7(7), 517-527; doi:10.3390/70700517
Received: 2 May 2002 / Revised: 1 July 2002 / Accepted: 8 July 2002 / Published: 31 July 2002
Cited by 8 | PDF Full-text (205 KB) | HTML Full-text | XML Full-text
Abstract The title compounds have been synthesized starting from l-menthone by application of a ring-closing metathesis reaction to confirm their reported absolute and relative stereochemistry. Comparisons of the NMR spectra and specific rotations are also discussed. Full article
Open AccessArticle Hydrogen Transfer from Hantzsch 1,4-Dihydropyridines to Carbon-Carbon Double Bonds under Microwave Irradiation
Molecules 2002, 7(7), 528-533; doi:10.3390/70700528
Received: 7 February 2002 / Revised: 9 July 2002 / Accepted: 10 July 2002 / Published: 31 July 2002
Cited by 15 | PDF Full-text (92 KB) | HTML Full-text | XML Full-text
Abstract 1,4-Dihydropyridines (DHPs) have been used in the reduction of carbon-carbon double bonds under microwave irradiation without solvent. The efficiency of the reactions is dramatically dependent on the steric effects in the DHPs and on the electronic effects in the olefins. Full article
Open AccessArticle Synthesis and Theoretical Study of a New Type of Pentacyclic bis-Benzothiazolium Compound
Molecules 2002, 7(7), 534-539; doi:10.3390/70700534
Received: 10 June 2002 / Revised: 29 July 2002 / Accepted: 30 July 2002 / Published: 31 July 2002
Cited by 5 | PDF Full-text (104 KB) | HTML Full-text | XML Full-text
Abstract
The synthesis of a new type of pentacyclic benzothiazolium compound -6,13-dihydropyrazino[2,1-b:5,4-b´]bis(1,3-benzothiazole)-7,14-diiumdibromide (2), is reported. Compound 2 was prepared by dimerization of 2-(bromomethyl)benzothiazole. Quantum chemical calculation studies have been carried out on the structures of possible isomers of 2, as well as the products
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The synthesis of a new type of pentacyclic benzothiazolium compound -6,13-dihydropyrazino[2,1-b:5,4-b´]bis(1,3-benzothiazole)-7,14-diiumdibromide (2), is reported. Compound 2 was prepared by dimerization of 2-(bromomethyl)benzothiazole. Quantum chemical calculation studies have been carried out on the structures of possible isomers of 2, as well as the products of its deprotonation reactions. Full article
Open AccessArticle Michael Reactions of Arylidenesulfonylacetonitriles. A New Route to Polyfunctional Benzo[a]quinolizines
Molecules 2002, 7(7), 540-548; doi:10.3390/70700540
Received: 29 January 2002 / Revised: 10 July 2002 / Accepted: 11 July 2002 / Published: 31 July 2002
Cited by 3 | PDF Full-text (42 KB) | HTML Full-text | XML Full-text
Abstract Arylidenesulfonylacetonitriles react in acetonitrile with 1-methylisoquinoline and isoquinolin-1-yl-acetonitrile in the presence of piperidine to give benzo[a]quinolizines 6,9 and 7,10, respectively. The structures of the products were established on the basis of elemental and spectral analyses and their chemical reactivity. Full article
Open AccessArticle Synthesis and Structure of the Cadmium (II) Complex: [Cd(C5H5N)2(S2CO-n-C4H9)2]
Molecules 2002, 7(7), 549-553; doi:10.3390/70700549
Received: 9 February 2002 / Revised: 30 July 2002 / Accepted: 31 July 2002 / Published: 31 July 2002
Cited by 13 | PDF Full-text (62 KB)
Abstract
The [Cd(C5H5N)2(S2CO-n-C4H9)2] adduct of pyridine with [Cd(S2CO-n-C4H9)2]n was synthesized and characterized by IR, elemental analysis,1H-NMR and X-ray diffraction analysis. The crystasl
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The [Cd(C5H5N)2(S2CO-n-C4H9)2] adduct of pyridine with [Cd(S2CO-n-C4H9)2]n was synthesized and characterized by IR, elemental analysis,1H-NMR and X-ray diffraction analysis. The crystasl belong to the monoclinic system, space group P2(1)/c with Z=2. Cell dimensions are a=1.1094(12), b=0.6152(6), c=1.7985(19) nm, • =96.148(2)°, V=1.2204(2)nm3. The structure was refined to R=0.0246 and wR=0.0645 for 2624 reflections with I>2•(I). The complex has a centrosymmetric molecule structure. Full article
Open AccessArticle Annellation of Triazole and Tetrazole Systems onto Pyrrolo[2,3-d]pyrimidines: Synthesis of Tetrazolo[1,5-c]-pyrrolo[3,2-e]-pyrimidines and Triazolo[1,5-c]pyrrolo-[3,2-e]pyrimidines as Potential Antibacterial Agents
Molecules 2002, 7(7), 554-565; doi:10.3390/70700554
Received: 5 May 2002 / Revised: 12 July 2002 / Accepted: 28 July 2002 / Published: 31 July 2002
Cited by 19 | PDF Full-text (60 KB) | HTML Full-text | XML Full-text
Abstract Syntheses of several novel 4-chloropyrrolo[2,3-d]pyrimidines (1), 4-hydrazinopyrrolo[2,3-d]pyrimidines (2) and 3-amino-4-iminopyrrolo[2,3-d]pyrimidines (7) and their use in the synthesis of tetrazolo[1,5-c]pyrrolo[3,2-e]pyrimidines (3) and triazolo[1,5-c]pyrrolo[3,2-e]pyrimidines (4) required for biological screening are reported. Full article

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