First stereoselective synthesis of enantiomerically pure telluronium salts by the reaction of chiral halooxatelluranes with Grignard reagents
作者:Jian Zhang、Shinichi Saito、Toru Koizumi
DOI:10.1016/s0957-4166(97)00459-x
日期:1997.10
We prepared a series of enantiomerically pure benzyl and allyl telluronium salts 2 and 4, using the 2-exo-hydroxy-10-bornyl group as a chiral ligand, in high yield and selectivity by the reaction of chiral haloalkoxytelluranes 1 and 3 with Grignard reagents. A sharp pyramidal structure with S absolute configuration at the tellurium atom was confirmed by an X-ray analysis of 2c. (C) 1997 Published by Elsevier Science Ltd.