Asymmetric synthesis of Sedum alkaloids via lithium amide conjugate addition
作者:Stephen G. Davies、Ai M. Fletcher、Paul M. Roberts、Andrew D. Smith
DOI:10.1016/j.tet.2009.09.104
日期:2009.12
Conjugateaddition of lithium (R)-N-allyl-N-(α-methylbenzyl)amide or lithium (R)-N-but-3-enyl-N-(α-methylbenzyl)amide to an alkyl hexa-2,4-dienoate or alkyl hepta-2,6-dienoate, followed by ring-closing metathesis of the olefin functionalities within the resultant β-amino ester, generates a range of diastereoisomerically pure azacycles in good yield. These homochiral templates are readily transformed