Magnesium Coordination-Directed <i>N</i>-Selective Stereospecific Alkylation of 2-Pyridones, Carbamates, and Amides Using α-Halocarboxylic Acids
作者:Yuan-Qing Fang、Matthew M. Bio、Karl B. Hansen、Matthew S. Potter、Andrew Clausen
DOI:10.1021/ja107709w
日期:2010.11.10
A general inversion-stereospecific, N-selective alkylation of substituted 2-pyridones (and analogues), amides, and carbamates using chiral α-chloro- or bromocarboxylic acids in the presence of KOt-Bu (or KHMDS) and Mg(Ot-Bu)(2) is reported. The resulting α-chiral carboxylic acid products were isolated by crystallization in good chemical yields and in high ee (>90% ee). Mechanistic evidence suggests