Compound of the formula
wherein R, and R2 are each independently -H or lower alkoxy; R3 and R4 are each independently lower alkyl; and Rs and R6 are each -OCH3 or together form -OCH2O-or -OCH2CH2O-, and pharmaceutically acceptable acid addition salts thereof are disclosed as calcium channel blockers useful for treating cardiovascular disorders, including angina, hypertension and congestive heart failure.
Asymmetric Synthesis of Tetracyclic Benzo[<i>a</i>]quinolizidine Targets
作者:Steven M. Allin、Sean N. Gaskell、Mark R. J. Elsegood、William P. Martin
DOI:10.1021/jo801019h
日期:2008.8.1
We report a novel, facile, and asymmetric approach for the synthesis of polycyclic benzo[a]quinolizidine targets. In the formation of more functionalized derivatives, we have observed the generation of an iminium ether salt intermediate, formed during an unprecedented retro-Diels-Alder/N-acyliminium cyclization cascade. The iminium ether intermediate was isolated in good yield, characterized by X-ray crystallography, and subsequently applied as a synthetic building block.
US4613606A
申请人:——
公开号:US4613606A
公开(公告)日:1986-09-23
US4681889A
申请人:——
公开号:US4681889A
公开(公告)日:1987-07-21
A formal asymmetric synthesis of both enantiomers of the Erythrina alkaloid 3-demethoxyerythratidinone
作者:Steven M Allin、Guy B Streetley、Martin Slater、Stella L James、William P Martin
DOI:10.1016/j.tetlet.2004.05.060
日期:2004.7
A formal asymmetric synthesis of both enantiomers of the Erythrinaalkaloid 3-demethoxyerythratidinone is reported through the application of a highly functionalised lactam template as an N-acyliminium precursor.