Inexpensive, multigram-scale preparation of an enantiopure cyclic nitrone via resolution at the hydroxylamine stage
作者:Maryse Thiverny、Emilien Demory、Benoit Baptiste、Christian Philouze、Pierre Y. Chavant、Véronique Blandin
DOI:10.1016/j.tetasy.2011.07.002
日期:2011.6
The reduction of the chiral, racemic nitrone MiPNO provides a secondary hydroxylamine. Its O-acylation with O,O'-dibenzoyl-L-tartaric acid anhydride gives two diastereomers, that can be easily separated by selective dissolution in orthogonal solvents. The recovery of the enantiopure nitrone is then carried out in a single step. The process allows the straightforward isolation of (R) and (S)-MiPNO in 57% and 38% yield, respectively, from rac-MiPNO. (C) 2011 Elsevier Ltd. All rights reserved.