Protecting group controlled diastereoselective allylation of asymmetrized bis (hydroxymethyl)acetaldehydes (BHYMA*)
作者:Giuseppe Guanti、Luca Banfi、Enrica Narisano
DOI:10.1016/0040-4039(91)80449-g
日期:1991.11
MgBr2 catalysed allylation of a series of diprotected asymmetrized bis (hydroxymethyl)acetaldehydes 2 with allyltributylstannane proceeds with good diastereoselectivity. The stereochemical results are in line with a cyclic chelated transition state, where only one of the two CH2OR appendages, due to the different nature of protecting groups, is capable of coordinating the Lewis acid.