1,1- and 1,2-Allylboration of Alkyn-1-ylsilanes Bearing Si-H Functions. Electron-Deficient Si-H-B Bridges, and Intramolecular Hydrosilylation
作者:Bernd Wrackmeyer、Oleg L. Tok
DOI:10.1515/znb-2006-0303
日期:2006.3.1
formed by stereoselective 1,1-allylboration, with the silyl and the diallylboryl groups in cis-positions at the C=C bond an electron-deficient Si-H-B bridge is present. The activation of the Si-H bond in these alkenes induces intramolecular hydrosilylation under very mild reaction conditions to give 1,4-silabora-cyclohept-2-enes (7 and 11). The products of 1,2-allylboration (6, 10, 14) are further
摘要 在硅原子上带有甲基和一 (2)、二 (3) 或三个氢化物官能团 (4) 的正己炔-1-基硅烷或芳基乙炔-1-基硅烷与三烯丙基硼烷 1 的反应主要产生产物1,1-或1,2-烯丙基硼化。在通过立体选择性 1,1-烯丙基硼化形成的烯烃 (5, 9, 13) 中,甲硅烷基和二烯丙基硼基在 C=C 键的顺式位置上存在缺电子的 Si-HB 桥。这些烯烃中 Si-H 键的活化在非常温和的反应条件下诱导分子内氢化硅烷化,得到 1,4-silabora-cyclohept-2-enes(7 和 11)。1,2-烯丙基硼化产物(6, 10, 14)进一步转化为1-boracyclohex-2-enes(8, 12, 15)和7-borabicyclo[3.3.1]non-2-enes(16, 17) 通过分子内 1,2-烯丙基硼化反应。