Regioselective Synthesis of Highly Functionalized Biaryls through Carbanion Induced Ring Transformation of 2<i>H-</i>Pyran-2-ones
作者:Vishnu Ji Ram、Abhishek Shanker Saxena、Atul Goel
DOI:10.1055/s-2002-33538
日期:——
An expedient synthesis of highly functionalized unsymmetrical biaryls 3 of which one of the two phenyl rings substituted with carbomethoxy, amino and nitrile functionalities is described and illustrated by carbanion induced ring transformation of 6-aryl-3-carbomethoxy-4-methylsulfanyl-2H-pyran-2-one 1 using malononitrile 2 as a source of carbanion in moderate yield.
Synthesis of Dipyridinyls and Terpyridinyls with Phenyl Spacers through Base Induced Ring Transformation Reactions
作者:Vishnu J. Ram、Atul Goel
DOI:10.1246/cl.1997.1021
日期:1997.10
A novel approach to the synthesis of dipyridinyls (3a,b, 5a,b, 6c,d) and terpyridinyls (6a,b, 7a,b) with phenyl and 1,3-terphenyl spacers is delineated by baseinduced ring transformation reactions of 6-pyridyl-3-carbomethoxy-4-methylthio-2H-pyran-2-ones.
Carbanion-Induced Base-Catalyzed Synthesis of 1<i>H</i>-Isothiochromenes, Benzo[<i>c</i>]thiochromenes, Benzo[<i>c</i>]chromenes, and 1-Benzothiophenes through Ring-Transformation Reactions of 6-Aryl-2<i>H</i>-pyran-2-ones<sup>†</sup>
作者:Vishnu Ji Ram、P. Srivastava、Abhishek S. Saxena
DOI:10.1021/jo0100648
日期:2001.8.1
An innovative approach to the one-pot synthesis of highly functionalized 3,4-dihydro-1H-isothiochromenes (3), 6H-benzo[c]thiochromenes (5, 6), 6H-benzo[c]chromenes (8), and 2,3-dihydro-1-benzothiophenes (10, 11) is delineated from the reaction of a suitably functionalized 6-aryl-3-carbomethoxy-4-methylthio-2H-pyran-2-one (1) and a carbanion generated from tetrahydrothiopyran-4-one, 4-thiochromanone