Stereodivergent Synthesis of β-Heteroatom-Substituted Vinylsilanes by Sequential Silylzincation–Copper(I)-Mediated Electrophilic Substitution
作者:Martin Oestreich、Alejandro Perez-Luna、Carolin Fopp、Kevin Isaac、Elise Romain、Fabrice Chemla、Franck Ferreira、Olivier Jackowski
DOI:10.1055/s-0036-1588106
日期:——
stereoretentive copper(I)-mediated electrophilic substitution of the intermediate C(sp2)–Zn bond. These stereodivergent protocols offer a regio- and stereoselective access to trisubstituted vinylsilanes decorated with sulfur-, oxygen-, and phosphorus substituents with either double-bond geometry. Sulfur-, oxygen-, and phosphorus-substituted terminal alkynes undergo regio- and stereoselective silylzincation
摘要 硫,氧和磷取代的末端炔烃通过与(Me 2 PhSi)2 Zn,(Me 3 Si)3 SiH / Et 2 Zn或[(Me 3 Si)3 Si]反应而进行区域和立体选择性甲硅烷基锌化反应2 Zn / Et 2 Zn。贯穿C–C三键的加成始终以β-区域选择性发生,但立体选择性可调:顺式为(Me 2 PhSi)2 Zn,顺式为(Me 3 Si)3 SiH / Et 2 Zn或[(Me 3 Si)3 Si] 2 Zn / Et反式为2 Zn 。使用锌试剂(Me 2 PhSi)2 Zn和[(Me 3 Si)3 Si] 2 Zn的程序可以与一锅中随后的立体保持铜(I)介电亲电取代中间体C结合使用(sp 2)–Zn键。这些立体发散方案可对具有硫键,氧键和磷取代基且具有双键几何结构的三取代乙烯基硅烷进行区域和立体选择。 硫,氧和磷取代的末端炔烃通过与(Me 2 PhSi)2 Zn,(Me 3 Si)3