4-Substituted-α,α-diaryl-prolinols Improve the Enantioselective Catalytic Epoxidation of α,β-Enones
作者:Yawen Li、Xinyuan Liu、Yingquan Yang、Gang Zhao
DOI:10.1021/jo0617619
日期:2007.1.1
To seek novel metal-free organic catalysts for epoxidation with high stereoselectivity, a series of 4-substituted-α,α-diaryl-prolinols were synthesized in four steps from trans-4-hydroxyl-l-proline. These prolinol derivatives catalyzed the asymmetric epoxidation of α,β-enones to give the corresponding chiral epoxides in good yields and high enantioselectivities under mild reaction conditions. Studies
为了寻求具有高立体选择性的新型无金属有机环氧化物,由反式-4-羟基-1-脯氨酸分四个步骤合成了一系列4-取代的-α,α-二芳基-脯氨醇。这些脯氨醇衍生物催化α,β-烯酮的不对称环氧化,在温和的反应条件下以良好的收率和高对映选择性产生相应的手性环氧化物。取代基对对映选择性的作用研究表明,空间体积和电子效应促进了较高的对映选择性,而脯氨醇8a被认为是迄今为止最好的催化剂。