Variation in the aromatic ring of cromakalim: antihypertensive activity of pyranopyridines and 6-alkyl-2H-1-benzopyrans
摘要:
The synthesis and antihypertensive activity in the spontaneously hypertensive rat of two new series of analogues related to cromakalim (1) are described. In the first series, where the benzopyran nucleus has been replaced by a pyranopyridine nucleus, the position of the nitrogen atom has been found to be critical for activity, and the most potent compounds are the pyrano[3,2-c]pyridines. In the second series, where the powerful electron-withdrawing cyano group of compound 1 has been replaced by alkyl and phenyl groups, the order of antihypertensive potency is ethyl, isopropyl, tert-butyl greater than propyl, cyclopentyl greater than methyl greater than phenyl.
Variation in the aromatic ring of cromakalim: antihypertensive activity of pyranopyridines and 6-alkyl-2H-1-benzopyrans
摘要:
The synthesis and antihypertensive activity in the spontaneously hypertensive rat of two new series of analogues related to cromakalim (1) are described. In the first series, where the benzopyran nucleus has been replaced by a pyranopyridine nucleus, the position of the nitrogen atom has been found to be critical for activity, and the most potent compounds are the pyrano[3,2-c]pyridines. In the second series, where the powerful electron-withdrawing cyano group of compound 1 has been replaced by alkyl and phenyl groups, the order of antihypertensive potency is ethyl, isopropyl, tert-butyl greater than propyl, cyclopentyl greater than methyl greater than phenyl.
Studies of Substituent Effect on Asymmetric Epoxidation of Chromenes by Chiral Dioxirane
作者:O. Andrea Wong、Yian Shi
DOI:10.1021/jo0604179
日期:2006.5.1
A series of 6- and 8-substituted chromenes has been investigated for asymmetric epoxidation using chiral ketone catalysts. Up to 93% ee was achieved. Higher ee's are obtained when substrates are substituted at the 6- position. The enhanced enantioselectivity is likely due to the beneficial interaction between the 6-substituent of the substrate and the N-aryl or alkyl group of the ketone catalyst.
BURRELL, GORDON;CASSIDY, FREDERICK;EVANS, JOHN M.;LIGHTOWLER, DIANE;STEMP+, J. MED. CHEM., 33,(1990) N1, C. 3023-3027
作者:BURRELL, GORDON、CASSIDY, FREDERICK、EVANS, JOHN M.、LIGHTOWLER, DIANE、STEMP+