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Molecules, Volume 3, Issue 3 (March 1998) – 35 articles , Pages 51-131, Articles M49-M73

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68 KiB  
Article
Evaluation of Effect of Microwave Irradiation on Syntheses and Reactions of Some New 3-Acyl-methylchromones
by Margita Lacova, Hafez M. El-Shaaer, Dusan Loos, Maria Matulova, Jarmila Chovancova and Mikulas Furdik
Molecules 1998, 3(3), 120-131; https://doi.org/10.3390/30300120 - 10 Mar 1998
Cited by 16 | Viewed by 7373
Abstract
The 3-Acyl-2-R-methylchromones (R = H, ArO, C6H4(CO)2N) were prepared in good yields by different methods from 2-hydroxyaroylacetone derivatives. Some subsequent reactions of these compounds with hydroxylamine and 3-formylchromones are described. The effect of microwave irradation on some condensation reactions was studied. Full article
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Scheme 1

466 KiB  
Article
Enantiodivergent Synthesis of (R)- and (S)-Rolipram
by Joachim Demnitz, Luigi LaVecchia, Edmond Bacher, Thomas H. Keller, Thomas Müller, Friedrich Schürch, Hans-Peter Weber and Esteban Pombo-Villar
Molecules 1998, 3(3), 107-119; https://doi.org/10.3390/30300107 - 10 Mar 1998
Cited by 38 | Viewed by 10570
Abstract
Both enantiomers of rolipram (1) have been prepared in large quantity from a common intermediate rac-3-(3’-cyclopentyloxy-4’-methoxy)phenyl-4-nitro butyric acid (6), which was resolved by way of the two readily separable diastereoisomeric amides obtained with (S)-(-)-phenylethylamine. Reduction of the nitro group and intramolecular transamidation [...] Read more.
Both enantiomers of rolipram (1) have been prepared in large quantity from a common intermediate rac-3-(3’-cyclopentyloxy-4’-methoxy)phenyl-4-nitro butyric acid (6), which was resolved by way of the two readily separable diastereoisomeric amides obtained with (S)-(-)-phenylethylamine. Reduction of the nitro group and intramolecular transamidation gave (R)-(-)-1 and (S)-(+)-1, respectively. CD spectra of both enantiomers of rolipram are reported and discussed. Both enantiomers of rolipram presented the same potency of inhibitory activity against recombinant cyclic-AMP-selective phosphodiesterase (PDE4) subtypes. Full article
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Figure 1

41 KiB  
Article
A New Convenient Synthesis of 5-Acyl-1,2,3,4-tetrahydropyrimidine-2-thiones/ones
by Anatoly D. Shutalev, Ekaterina A. Kishko, Natalie V. Sivova and Aleksei Yu. Kuznetsov
Molecules 1998, 3(3), 100-106; https://doi.org/10.3390/30300100 - 09 Mar 1998
Cited by 121 | Viewed by 8038
Abstract
An efficient one-pot synthesis of 5-acyl-1,2,3,4-tetrahydropyrimidine-2-thiones/ones is described. The synthesis is based on the reaction of readily available α-tosyl substituted thioureas or ureas with enolates of β-oxoesters or 1,3-dicarbonyl compounds followed by acid-catalyzed dehydration of the obtained 5-acyl-4-hydroxyhexahydropyrimidine-2-thiones/ones. Full article
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Scheme 1

414 KiB  
Review
Elemental and Molecular Heritage: An Internet-based Display
by Henry S. Rzepa
Molecules 1998, 3(3), 94-99; https://doi.org/10.3390/30300094 - 09 Mar 1998
Cited by 5 | Viewed by 8659
Abstract
The background to a Web page describing elemental and molecular heritage at Imperial College chemistry department is described. Photographs are shown of the original samples of elemental bromine and crystalline silicon, and molecular ferrocene and mauveine. 3D "Hyperactive" models of these systems are [...] Read more.
The background to a Web page describing elemental and molecular heritage at Imperial College chemistry department is described. Photographs are shown of the original samples of elemental bromine and crystalline silicon, and molecular ferrocene and mauveine. 3D "Hyperactive" models of these systems are shown, together with a recently discovered heterocyclic systems scorpionine, which like mauveine is made by a deceptively simple chemical synthesis. Full article
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106 KiB  
Short Note
(E)-3-(2-Methoxyphenyl)-2-butenoic Acid
by Martin J. Stoermer and John T. Pinhey
Molecules 1998, 3(3), M73; https://doi.org/10.3390/M73 - 06 Mar 1998
Viewed by 3873
Abstract
The general part of the experimental section [1] has been presented elsewhere.[...] Full article
(This article belongs to the Section Molbank Section of Molecules, 1997-2001)
116 KiB  
Short Note
Ethyl (Z)-3-(2-Methoxyphenyl)-2-butenoate
by Martin J. Stoermer and John T. Pinhey
Molecules 1998, 3(3), M72; https://doi.org/10.3390/M72 - 06 Mar 1998
Cited by 1 | Viewed by 3848
Abstract
The synthetic procedure [1] has been presented elsewhere.[...] Full article
(This article belongs to the Section Molbank Section of Molecules, 1997-2001)
119 KiB  
Short Note
Ethyl (E)-3-(2-Methoxyphenyl)-2-butenoate
by Martin J. Stoermer and John T. Pinhey
Molecules 1998, 3(3), M71; https://doi.org/10.3390/M71 - 06 Mar 1998
Viewed by 3878
Abstract
The general part of the experimental section [1] has been presented elsewhere.[...] Full article
(This article belongs to the Section Molbank Section of Molecules, 1997-2001)
103 KiB  
Short Note
bis-[(Z)-5-Phenyl-2-penten-2-yl]mercury
by Martin J. Stoermer and John T. Pinhey
Molecules 1998, 3(3), M70; https://doi.org/10.3390/M70 - 06 Mar 1998
Cited by 1 | Viewed by 3815
Abstract
The general part of the experimental section [1] has been presented elsewhere.[...] Full article
(This article belongs to the Section Molbank Section of Molecules, 1997-2001)
101 KiB  
Short Note
[(Z)-5-Phenyl-2-penten-2-yl]mercury Acetate
by Martin J. Stoermer and John T. Pinhey
Molecules 1998, 3(3), M69; https://doi.org/10.3390/M69 - 06 Mar 1998
Cited by 1 | Viewed by 3819
Abstract
The general part of the experimental section [1] has been presented elsewhere.[...] Full article
(This article belongs to the Section Molbank Section of Molecules, 1997-2001)
99 KiB  
Short Note
[(Z)-5-Phenyl-2-penten-2-yl]mercury Bromide
by Martin J. Stoermer and John T. Pinhey
Molecules 1998, 3(3), M68; https://doi.org/10.3390/M68 - 06 Mar 1998
Cited by 1 | Viewed by 3699
Abstract
The general part of the experimental section [1] has been presented elsewhere.[...] Full article
(This article belongs to the Section Molbank Section of Molecules, 1997-2001)
102 KiB  
Short Note
Tributyl-[(Z)-5-phenyl-2-penten-2-yl]stannane
by Martin J. Stoermer and John T. Pinhey
Molecules 1998, 3(3), M67; https://doi.org/10.3390/M67 - 06 Mar 1998
Cited by 3 | Viewed by 4042
Abstract
The general part of the experimental section [1] has been presented elsewhere.[...] Full article
(This article belongs to the Section Molbank Section of Molecules, 1997-2001)
103 KiB  
Short Note
(Z)-2-Bromo-5-phenyl-2-pentene
by Martin J. Stoermer and John T. Pinhey
Molecules 1998, 3(3), M66; https://doi.org/10.3390/M66 - 06 Mar 1998
Viewed by 4189
Abstract
The general part of the experimental section [1] has been presented elsewhere.[...] Full article
(This article belongs to the Section Molbank Section of Molecules, 1997-2001)
96 KiB  
Short Note
2,3-Dibromo-2-methyl-5-phenylpentanoic Acid
by Martin J. Stoermer and John T. Pinhey
Molecules 1998, 3(3), M65; https://doi.org/10.3390/M65 - 06 Mar 1998
Viewed by 3886
Abstract
The general part of the experimental section [1] has been presented elsewhere.[...] Full article
(This article belongs to the Section Molbank Section of Molecules, 1997-2001)
104 KiB  
Short Note
(E)-2-Methyl-5-phenyl-2-pentenoic Acid
by Martin J. Stoermer and John T. Pinhey
Molecules 1998, 3(3), M64; https://doi.org/10.3390/M64 - 06 Mar 1998
Viewed by 3785
Abstract
The general part of the experimental section [1] has been presented elsewhere.[...] Full article
(This article belongs to the Section Molbank Section of Molecules, 1997-2001)
112 KiB  
Short Note
Ethyl (Z)-2-Methyl-5-phenyl-2-pentenoate
by Martin J. Stoermer and John T. Pinhey
Molecules 1998, 3(3), M63; https://doi.org/10.3390/M63 - 06 Mar 1998
Viewed by 3727
Abstract
The synthetic procedure [1] has been presented elsewhere.[...] Full article
(This article belongs to the Section Molbank Section of Molecules, 1997-2001)
116 KiB  
Short Note
Ethyl (E)-2-Methyl-5-phenyl-2-pentenoate
by Martin J. Stoermer and John T. Pinhey
Molecules 1998, 3(3), M62; https://doi.org/10.3390/M62 - 06 Mar 1998
Viewed by 3880
Abstract
The general part of the experimental section [1] has been presented elsewhere.[...] Full article
(This article belongs to the Section Molbank Section of Molecules, 1997-2001)
97 KiB  
Short Note
3-Hydroxy-3-methyl-5-phenylpentanoic Acid
by Martin J. Stoermer and John T. Pinhey
Molecules 1998, 3(3), M61; https://doi.org/10.3390/M61 - 06 Mar 1998
Viewed by 3748
Abstract
The general part of the experimental section [1] has been presented elsewhere.[...] Full article
(This article belongs to the Section Molbank Section of Molecules, 1997-2001)
98 KiB  
Short Note
Ethyl 3-Acetoxy-3-methyl-5-phenylpentanoate
by Martin J. Stoermer and John T. Pinhey
Molecules 1998, 3(3), M60; https://doi.org/10.3390/M60 - 06 Mar 1998
Viewed by 3664
Abstract
The general part of the experimental section [1] has been presented elsewhere.[...] Full article
(This article belongs to the Section Molbank Section of Molecules, 1997-2001)
97 KiB  
Short Note
Ethyl 3-Hydroxy-3-methyl-5-phenylpentanoate
by Martin J. Stoermer and John T. Pinhey
Molecules 1998, 3(3), M59; https://doi.org/10.3390/M59 - 06 Mar 1998
Cited by 1 | Viewed by 3734
Abstract
The general part of the experimental section [1] has been presented elsewhere.[...] Full article
(This article belongs to the Section Molbank Section of Molecules, 1997-2001)
104 KiB  
Short Note
(E)-1-Bromo-2-methyl-4-phenyl-1-butene
by Martin J. Stoermer and John T. Pinhey
Molecules 1998, 3(3), M58; https://doi.org/10.3390/M58 - 06 Mar 1998
Viewed by 4079
Abstract
The general part of the experimental section [1] has been presented elsewhere.[...] Full article
(This article belongs to the Section Molbank Section of Molecules, 1997-2001)
102 KiB  
Short Note
(Z)-1-Bromo-2-methyl-4-phenyl-1-butene
by Martin J. Stoermer and John T. Pinhey
Molecules 1998, 3(3), M57; https://doi.org/10.3390/M57 - 06 Mar 1998
Viewed by 3789
Abstract
The general part of the experimental section [1] has been presented elsewhere.[...] Full article
(This article belongs to the Section Molbank Section of Molecules, 1997-2001)
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Figure 1

103 KiB  
Short Note
2(R,S),3(S,R)-2,3-Dibromo-3-methyl-5-phenyl-2-pentanoic Acid
by Martin J. Stoermer and John T. Pinhey
Molecules 1998, 3(3), M56; https://doi.org/10.3390/M56 - 06 Mar 1998
Cited by 1 | Viewed by 3917
Abstract
The general part of the experimental section [1] has been presented elsewhere.[...] Full article
(This article belongs to the Section Molbank Section of Molecules, 1997-2001)
103 KiB  
Short Note
2(S,R),3(R,S)-2,3-Dibromo-3-methyl-5-phenyl-2-pentanoic Acid
by Martin J. Stoermer and John T. Pinhey
Molecules 1998, 3(3), M55; https://doi.org/10.3390/M55 - 06 Mar 1998
Cited by 2 | Viewed by 4164
Abstract
The general part of the experimental section [1] has been presented elsewhere.[...] Full article
(This article belongs to the Section Molbank Section of Molecules, 1997-2001)
102 KiB  
Short Note
(Z)-3-Methyl-5-phenyl-2-pentenoic Acid
by Martin J. Stoermer and John T. Pinhey
Molecules 1998, 3(3), M54; https://doi.org/10.3390/M54 - 06 Mar 1998
Viewed by 4021
Abstract
The general part of the experimental section [1] has been presented elsewhere.[...] Full article
(This article belongs to the Section Molbank Section of Molecules, 1997-2001)
105 KiB  
Short Note
(E)-3-Methyl-5-phenyl-2-pentenoic Acid
by Martin J. Stoermer and John T. Pinhey
Molecules 1998, 3(3), M53; https://doi.org/10.3390/M53 - 06 Mar 1998
Viewed by 3807
Abstract
The general part of the experimental section [1] has been presented elsewhere.[...] Full article
(This article belongs to the Section Molbank Section of Molecules, 1997-2001)
115 KiB  
Short Note
Ethyl (Z)-3-Methyl-5-phenyl-2-pentenoate
by Martin J. Stoermer and John T. Pinhey
Molecules 1998, 3(3), M52; https://doi.org/10.3390/M52 - 06 Mar 1998
Viewed by 3721
Abstract
The synthetic procedure [1] has been presented elsewhere. Ethyl (Z)-3-methyl-5-phenyl-2-pentenoate was obtained (2.23 g, 23%) as a colourless oil.[...] Full article
(This article belongs to the Section Molbank Section of Molecules, 1997-2001)
119 KiB  
Short Note
Ethyl (E)-3-methyl-5-phenyl-2-pentenoate
by Martin J. Stoermer and John T. Pinhey
Molecules 1998, 3(3), M51; https://doi.org/10.3390/M51 - 06 Mar 1998
Cited by 1 | Viewed by 3897
Abstract
The general part of the experimental section [1] has been presented elsewhere.[...] Full article
(This article belongs to the Section Molbank Section of Molecules, 1997-2001)
55 KiB  
Article
Application of Microwave in Organic Synthesis. Dry Synthesis of 2-Arylmethylene-3(2)-naphthofuranones
by Didier Villemin, Benoit Martin and Nathalie Bar
Molecules 1998, 3(3), 88-93; https://doi.org/10.3390/30300088 - 05 Mar 1998
Cited by 25 | Viewed by 8394
Abstract
3(2)-Naphthofuranone (1) was condensed in the presence of Al2O3-KF with aromatic aldehydes (4) to give arylidenenaphthofuranones (5a-f) without solvent under focused microwave irradiation. Full article
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91 KiB  
Short Note
Methyl 2,3-O-Isopropylidene-a-D-mannofuranoside 5,6-Carbonate
by Bohumil Steiner, Jan Gajdos and Miroslav Koos
Molecules 1998, 3(3), M50; https://doi.org/10.3390/M50 - 04 Mar 1998
Viewed by 2927
Abstract
Sugar carbonates can be prepared by the condensation of the cis-glycol system of the carbohydrate with phosgene or with a chloroformic ester [1,2].[...] Full article
(This article belongs to the Section Molbank Section of Molecules, 1997-2001)
117 KiB  
Short Note
Cycloartan-2b-2-methyl ButanoateIsolated from Genus Espeletia (Asteraceae)
by Tellez Nohemi, Torrenegra Ruben, Pedroyo Julio and Gray Alexander
Molecules 1998, 3(3), M49; https://doi.org/10.3390/M49 - 04 Mar 1998
Cited by 2 | Viewed by 3008
Abstract
We describe the isolation and characterization of a new cycloartane-type triterpenes, cycloartan- 2b-2-methyl butanoate.[...] Full article
(This article belongs to the Section Molbank Section of Molecules, 1997-2001)
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