Enantioselective Functionalization of Difluorocyclopropenes Catalyzed by Chiral Copper Complexes: Proposal for Chiral <i>gem</i>-Dimethyl and <i>tert</i>-Butyl Analogues
作者:Keisuke Sekine、Aina Ushiyama、Yu Endo、Koichi Mikami
DOI:10.1021/acs.joc.0c00622
日期:2020.6.19
The highly enantioselective copper/chiral phosphine-catalyzed hydro-, bora-, and carbo-metalations of difluorocyclopropenes with PHMS [H-Si], H-BPin, (BPin)2, and (CH3)2Zn [Zn-Me] are shown to regiodivergently afford highly enantioenriched and functionalized difluorocyclopropanes. These examples can be viewed as the first successful syntheses of “chiral” gem-dimethyl and tert-butyl analogues.
用PHMS [H-Si],H-BPin,(BPin)2和(CH 3)2 Zn [Zn-Me]高度对映选择性的铜/手性膦催化的二氟环丙烯的氢,硼和碳金属化已显示出它们在区域上发散地提供高度对映体富集和官能化的二氟环丙烷。这些实例可以被视为“手性”的宝石-二甲基和叔丁基类似物的首次成功合成。