Asymmetric diene cyclization/hydrosilylation/oxidation employing 1-tert-butyl-3,3-dimethyl-1,1-diphenyldisiloxane
作者:Tao Pei、Ross A Widenhoefer
DOI:10.1016/s0040-4039(00)01321-6
日期:2000.9
A 1:1 mixture of (NN)Pd(Me)Cl [NN=(R)-(+)-4-isopropyl-2-(2-pyridinyl)-2-oxazoline] (1) and NaBAr4 [Ar=3,5-C6H3(CF3)2] catalyzed the asymmetric cyclization/hydrosilylation of functionalized 1,6-dienes with 1-tert-butyl-3,3-dimethyl-1,1-diphenyldisiloxane at −20°C to form silylated cyclopentanes in good yield with up to 95% ee. These silylated carbocycles underwent oxidative cleavage of the CSi bond
(NN)Pd(Me)Cl [NN=(R)-(+)-4-异丙基-2-(2-吡啶基)-2-恶唑啉](1)和NaBAr的1:1混合物4 [Ar = 3,5-C 6 H 3(CF 3)2 ]催化官能化的1,6-二烯与1-叔丁基-3,3-二甲基-1,1-二苯基二硅氧烷的不对称环化/氢化硅烷化-20°C形成高收率ee高达95%ee的甲硅烷基化环戊烷。这些甲硅烷基化的碳环在室温下通过H 2 O 2进行CSi键的氧化裂解,形成相应的醇。