Pseudoephenamine: A Practical Chiral Auxiliary for Asymmetric Synthesis
作者:Marvin R. Morales、Kevin T. Mellem、Andrew G. Myers
DOI:10.1002/anie.201200370
日期:2012.5.7
Unrestricted: Pseudoephenamine is introduced as a versatile chiralauxiliary and an alternative to pseudoephedrine in asymmetricsynthesis. It is free from regulatory restrictions and leads to remarkable stereocontrol in alkylation reactions, especially in those that form quaternary carbon centers. Amides derived from pseudoephenamine exhibit a high propensity to be crystalline substances, and provide
Stereocontrolled Alkylative Construction of Quaternary Carbon Centers
作者:David A. Kummer、William J. Chain、Marvin R. Morales、Olga Quiroga、Andrew G. Myers
DOI:10.1021/ja806021y
日期:2008.10.8
formation of alpha,alpha-disubstituted enolates of pseudoephedrine amides are presented followed by the implementation of these in diastereoselective alkylation reactions. Direct alkylation of alpha,alpha-disubstituted pseudoephedrine amide substrates is demonstrated to be both efficient and diastereoselective across a range of substrates, as exemplified by alkylation of the diastereomeric pseudoephedrine