Asymmetric Total Synthesis of (−)-Alkaloid 223A and Its 6-Epimer
作者:Xiaotao Pu、Dawei Ma
DOI:10.1021/jo0341261
日期:2003.5.1
gamma-amino alcohols 7 and 18 are prepared by using the diastereoselective Michael addition of lithium N-benzyl (R)-alpha-methylbenzylamide to alpha,beta-unsaturated esters as a key step. The Michael addition of 7 or 18 to an alkynone 8 followed by an intramolecular cyclization afford the cyclic enamine 10 or 20, which are subjected to the diastereoselective hydrogenation, and the subsequent transformations