Asymmetric synthesis of β-substituted Baylis–Hillman products via lithium amide conjugate addition
作者:Alexander Chernega、Stephen G. Davies、Dirk. L. Elend、Christian A.P. Smethurst、Paul M. Roberts、Andrew D. Smith、G. Darren Smyth
DOI:10.1016/j.tet.2007.05.015
日期:2007.7
products has been developed. This procedure involves the diastereoselective conjugateaddition of lithium (R)-N-methyl-N-(α-methylbenzyl)amide to an α,β-unsaturated ester to generate an N-protected β-amino ester in high de. Subsequent asymmetric aldol reaction via deprotonation with LDA, transmetallation with B(OMe)3 and addition of an aldehyde gives a range of syn-aldol products in moderate to high de