Rh-Catalyzed Asymmetric Hydrogenation of β-Substituted-β-thio-α,β-unsaturated Esters: Expeditious Access to Chiral Organic Sulfides
作者:Gang Liu、Zhengyu Han、Xiu-Qin Dong、Xumu Zhang
DOI:10.1021/acs.orglett.8b02339
日期:2018.9.21
Rh/bifunctional bisphosphine-thiourea ligand (ZhaoPhos)-catalyzed asymmetric hydorgenation of both (Z)- and (E)-isomers of β-substituted-β-thio-α,β-unsaturated esters was successfully developed. This new asymmetric catalytic methodology provided highly efficient access to two enantiomers of chiral organic sulfides ethyl β-substituted-β-thio-propanoates with excellent results (up to 99% yield and >99%
成功开发了Rh /双官能双膦-硫脲配体(ZhaoPhos)催化的β-取代-β-硫代-α,β-不饱和酯的(Z)-和(E)异构体的不对称加氢反应。这种新的不对称催化方法可以高效地获得手性有机硫化物的两种对映异构体,即β-取代-β-硫代丙酸乙酯,具有优异的效果((Z)底物的收率可达99%,ee大于99%,99%(E)底物的5 %收率和ee的98%,TON高达5000),它们是有机合成中的重要中间体。