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Treatment of chiral alpha -benzyloxy- or alpha -propargyloxycarboxamide wit
h tert-BuLi gave beta -hydroxycarboxamides (aldol derivatives) in high opti
cal purity through the formation of alpha -lithiated ethers and the subsque
nt 1,2-Wittig rearrangement. (C) 2001 Elsevier Science Ltd. All rights rese
rved.