作者:Carolin Fopp、Elise Romain、Kevin Isaac、Fabrice Chemla、Franck Ferreira、Olivier Jackowski、Martin Oestreich、Alejandro Perez-Luna
DOI:10.1021/acs.orglett.6b00680
日期:2016.5.6
Zinc reagents (Me2PhSi)2Zn and [(Me3Si)3Si]2Zn undergo highly regio- and stereoselective addition across the carbon–carbon triple bond of nitrogen-, sulfur-, oxygen-, and phosphorus-substituted terminal alkynes in the absence of copper or any other catalyst. Both reagents yield exclusively β-isomers, and the stereoselectivity is determined by the silyl group: Me2PhSi for cis or (Me3Si)3Si for trans
锌试剂(Me 2 PhSi)2 Zn和[(Me 3 Si)3 Si] 2 Zn在氮,硫,氧和磷取代的末端的碳-碳三键上进行高度区域和立体选择性加成炔烃在没有铜或任何其他催化剂的情况下。两种试剂仅产生β-异构体,且立体选择性由甲硅烷基决定:顺式为Me 2 PhSi或反式为(Me 3 Si)3 Si。这些立体发散性的甲硅烷基锌化协议可有效地访问具有双键几何结构的杂原子取代的乙烯基硅烷,包括通过铜(I)介导的碳-碳键一键亲电取代中间C(sp 2)-Zn键的三取代乙烯基硅烷编队。