Asymmetric Synthesis of Trisubstituted Tetrahydrothiophenes via in Situ Generated Chiral Fluoride-Catalyzed Cascade Sulfa-Michael/Aldol Reaction of 1,4-Dithiane-2,5-diol and α,β-Unsaturated Ketones
作者:Mengying Duan、Yidong Liu、Jun Ao、Lu Xue、Shilong Luo、Yu Tan、Wenling Qin、Choong Eui Song、Hailong Yan
DOI:10.1021/acs.orglett.7b00813
日期:2017.5.5
A chiral fluoride-catalyzed asymmetric cascade sulfa-Michael/aldol condensation reaction of 1,4-dithiane-2,5-diol and a series of α,β-unsaturated ketones is described to access chiral trisubstituted tetrahydrothiophene derivatives. The target products, including the spiro tetrahydrothiophene derivatives bearing a five-, six-, and seven-membered ring, were highly functionalized and showed high ee value
描述了手性氟化物催化的1,4-二噻吩-2,5-二醇与一系列α,β-不饱和酮的不对称级联磺胺-迈克尔/羟醛缩合反应,以访问手性三取代四氢噻吩衍生物。目标产物,包括带有五,六和七元环的螺四氢噻吩衍生物,被高度官能化并显示出高ee值。这个既定的方案通过原位产生的手性氟化物实现了催化量的KF和Song的手性oligoEG的高度对映选择性反应,从而构建了非常复杂的有用的杂环骨架。