Michael Reactions of Pseudoephedrine Amide Enolates: Effect of LiCl on Syn/Anti Selectivity
作者:Jacqueline H. Smitrovich、Lisa DiMichele、Chuanxing Qu、Geneviève N. Boice、Todd D. Nelson、Mark A. Huffman、Jerry Murry
DOI:10.1021/jo035564a
日期:2004.3.1
asymmetric Michael reaction of pseudoephedrine amide enolates changes dramatically in the presence of LiCl. Reaction of the enolate in the absence of LiCl results in formation of the antiMichael adduct with high selectivity, whereas in the presence of lithium chloride the syn adduct is favored. This method provides access to enantiomerically enriched trans-3,4-disubstituted δ-lactones from the anti Michael