Asymmetric Synthesis of α-Amino Acids: Preparation and Alkylation of Monocyclic Iminolactones Derived from α-Methyl <i>trans</i>-Cinnamaldehyde
作者:Ta-Jung Lu、Cheng-Kun Lin
DOI:10.1021/jo801514g
日期:2008.12.19
monocyclic iminolactones 14a and 14b have been prepared. The chiral auxiliary 12 was obtained from alpha-methyl-trans-cinnamaldehyde through reduction, methylation, Sharpless asymmetric dihydroxylation, and oxidation in 87% overall yield. Esterification of compound 12 with the respective protected aminoacids followed by deprotection and cyclization provided the corresponding iminolactones, each in 82%