σ–π Chelation-controlled chemoselective ring openings of epoxides
作者:Naoki Asao、Taisuke Kasahara、Yoshinori Yamamoto
DOI:10.1016/s0040-4039(01)01669-0
日期:2001.10
The chemoselective ring opening of alkynyl epoxides in the co-existence of the corresponding alkyl epoxides is achieved in the Me3Al mediated reaction with alkynyllithium reagents. The observed interesting chemoselectivity is most probably a reflection of bidentate complexation of the Lewis acid to an n-electron of an oxygen atom of the epoxide and pi -electrons of the C C triple bond. (C) 2001 Elsevier Science Ltd. All rights reserved.