Opposite π-Face Selectivity for the DMD and <i>m</i>-CPBA Epoxidations of Chiral 2,2-Dimethyloxazolidine Derivatives of Tiglic Amides: Control by Steric Interactions versus Hydrogen Bonding
作者:Waldemar Adam、Aurelia Pastor、Karl Peters、Eva-Maria Peters
DOI:10.1021/ol990405s
日期:2000.4.1
A high extent but opposite sense in the diastereoselectivity has been observed for the DMD and m-CPBA epoxidations of the optically active tiglic amides (S)-1 with 2,2-dimethyloxazolidines as chiral auxiliaries, This unprecedented reversed pi-facial differentiation for these two peroxidic oxidants is rationalized in terms of like (lk) and unlike (ul) transition structures: For DMD, steric interactions dominate, such that the unlike transition structure is favored, while for m-CPBA, hydrogen bonding effects overcome these steric repulsions and the like one is preferred.