Reagent control in the aldol addition reaction of chiral boron enolates with chiral aldehydes. Total synthesis of (3S,4S)-Statine
作者:Cesare Gennari、Daniela Moresca、Anna Vulpetti、Gilles Pain
DOI:10.1016/s0040-4020(97)00215-9
日期:1997.4
Boron enolates bearing menthone-derived chiral ligands are capable of fair to excellent diastereocontrol in their reactions with chiral aldehydes. Thioester-derived (better than ketone derived) enolates are able to control aldol stereochemistry irrespective of the aldehyde preferences. With thioacetate-derived chiral enolates and enantiopure N,N-dibenzyl α-amino aldehydes, either the 3,4-anti or the
带有薄荷酮的手性配体的硼烯醇盐在与手性醛的反应中能够公平地控制非对映异构。硫醛衍生的(优于酮衍生的)烯醇化物能够控制醛醇的立体化学,而与醛的偏好无关。用硫代乙酸酯衍生的手性烯醇化物和对映体纯的N,N-二苄基α-氨基醛,仅通过改变手性硼配体构型就可以以非常高的非对映选择性获得3,4-抗-或3,4-顺式醇醛加合物。上述步骤用于(3S,4S)-他汀的立体选择性全合成。