N-sulfinylimines were found to be efficient as chiral imine equivalents in the high-temperature Reformatsky-type additions with BrZnCF(2)COOEt affording an efficient approach to the enantiomerically pure alpha,alpha-difluoro-beta-amino acids. High chemical and stereochemical yields (drs > 9:1, and as high as 99:1) render this method immediately useful for preparing the target amino acids.
发现对映体纯的戴维斯N-亚磺
酰亚胺在BrZnCF(2)COOEt高温Reformatsky型添加物中作为手性
亚胺等效物是有效的,从而为对映体纯的α,α-二
氟-β-
氨基酸提供了一种有效的方法。高
化学和立体
化学收率(drs> 9:1,高达99:1)使该方法立即可用于制备目标
氨基酸。