Synergistic substrate and catalyst effects in the addition of trimethylsilyl cyanide to imines derived from lactic acid
作者:Alexander M. Fields、Simon Jones
DOI:10.1016/j.tet.2019.04.067
日期:2019.6
Trimethylsilylcyanide was added to various imines derived from (2S)-ethyl lactate in the presence of Lewis acids to provide both syn- and anti- β-hydroxy-α-aminonitrile stereoisomers. Syn-products were found to be the major in most instances, however, anti-products were formed in good yield and selectivity in the presence of ZnI2 & BF3·OEt2 and N-(−)-α-methylbenzyl substituents via double stereo differentiation
在路易斯酸存在下,将三甲基甲硅烷基氰化物加到衍生自(2 S)-乳酸的各种亚胺中,以提供顺式和反式-β-羟基-α-氨基腈立体异构体。在大多数情况下,发现副产物是主要产物,但是,在存在ZnI 2和BF 3 ·OEt 2和N -(-)-α-甲基苄基取代基的情况下,通过双倍生成具有良好收率和选择性的反产物。立体分化。