Reactions of Tri-<i>tert</i>-Butylphosphatetrahedrane as a Spring-Loaded Phosphinidene Synthon Featuring Nickel-Catalyzed Transfer to Unactivated Alkenes
作者:Martin-Louis Y. Riu、André K. Eckhardt、Christopher C. Cummins
DOI:10.1021/jacs.2c02236
日期:2022.5.4
proposed to proceed through a generated phosphaalkene intermediate, which was characterized by NMR spectroscopy. In addition, we report on nickel-catalyzed phosphinidene transfer to styrene, ethylene, neohexene, and 1,3-cyclohexadiene; the corresponding phosphiranes were isolated in 51–64% yield. Computational studies suggest the intermediacy of a nickel phosphinidene species. Treatment of the ethylene-derived
描述了高度应变的三叔丁基磷酸四面体 (1) 的开笼反应,此处显示其作为 (三叔丁基环丙烯基) 膦的合成子起作用。用碱稳定的甲硅烷基处理1得到相应的磷腈,其以 72% 的收率被分离为红色结晶固体。当1 (2 equiv) 与 Wittig 试剂 Ph 3 PCH 2结合时,也观察到亚膦基转移形成二磷烷(50% 分离产率)。建议该反应通过生成的磷烯中间体进行,该中间体通过核磁共振光谱进行表征。此外,我们还报道了镍催化的亚膦转移到苯乙烯、乙烯、新己烯和 1,3-环己二烯;相应的磷烷以 51-64% 的收率被分离出来。计算研究表明镍亚膦物种的中间体。用三氟甲磺酸处理乙烯衍生的磷环产物可消除 [ t Bu 3 C 3 ]OTf 并形成 P-H 键,说明三叔丁基环丙烯基团作为保护基团的能力在膦亚胺转移后可去除。