ZnCl2-Mediated Stereoselective Addition of Terminal Alkynes to d-(+)-Mannofuranosyl Nitrones
摘要:
An optimized process for the addition of terminal alkynes to chiral nitrones using ZnCl2 and NEt3 in toluene is reported. The new reaction protocol is facile to perform and cost-effective. The resulting optically active propargyl N-hydroxylamines are isolated in good to excellent yield and high diastereoselectivity.
First Synthesis of Optically Pure Propargylic N-Hydroxylamines by Direct, Highly Diastereoselective Addition of Terminal Alkynes to Nitrones We thank the ETH, Roche Research Foundation, the Swiss National Science Foundation, Merck, and Aventis for their generous support.
作者:Roger Fässler、Doug E. Frantz、Jürg Oetiker、Erick M. Carreira