Conjugate reduction and reductive aldol cyclization of α,β-unsaturated thioesters catalyzed by (BDP)CuH
作者:Ninglin Li、Jun Ou、Michel Miesch、Pauline Chiu
DOI:10.1039/c1ob05352c
日期:——
A conjugate reduction of α,β-unsaturated thioesters catalyzed by copper hydride using PMHS as stoichiometric reductant has been developed. 1,2-Bis(diphenylphosphino)benzene (BDP) was the most effective ligand for this reduction. Saturated thioesters could be produced in excellent yields when the substituent on the thiol is not sterically-demanding. This protocol was applied to induce the reductive aldol cyclization of keto-enethioates, which could offer β-hydroxythioesters in moderate to good yields.
已开发出一种由铜氢化物催化、使用PMHS作为化学计量还原剂的α,β-不饱和硫酯的共轭还原反应。1,2-双(二苯膦基)苯(BDP)是该还原反应最有效的配体。当硫醇上的取代基空间要求不高时,可以高产率地生成饱和硫酯。该方案被应用于诱导酮烯硫酯的还原性醛醇环化反应,从而在中等至良好产率下获得β-羟基硫酯。