Direct Catalytic Asymmetric Aldol Reactions of Thioamides: Toward a Stereocontrolled Synthesis of 1,3-Polyols
作者:Mitsutaka Iwata、Ryo Yazaki、Yuta Suzuki、Naoya Kumagai、Masakatsu Shibasaki
DOI:10.1021/ja909758e
日期:2009.12.30
A direct catalytic asymmetric aldol reaction of thioamides with a soft Lewis acid/hard Brønsted base cooperative catalytic system comprising (R,R)-Ph-BPE/[Cu(CH(3)CN)(4)]PF(6)/LiOAr is described. Highly chemoselective deprotonative activation of thioamides allows for a direct aldol reaction of alpha-nonbranched aliphatic aldehydes, which are susceptible to self-condensation. Facile reduction of the
硫代酰胺与包含 (R,R)-Ph-BPE/[Cu(CH(3)CN)(4)]PF(6)/LiOAr 的软路易斯酸/硬布朗斯台德碱协同催化体系的直接催化不对称羟醛反应被描述。硫代酰胺的高度化学选择性去质子活化允许 α-非支化脂肪醛的直接羟醛反应,这些醛对自缩合敏感。硫代酰胺官能团的轻松还原和催化剂控制的第二醛醇反应以高度立体选择性的方式提供 1,3-二醇。