Palladium-Catalyzed Silylation of 2,3-Allenols with Unactivated Disilanes: Access to 2-Silyl-1,3-butadienes and α-Silyl-β-hydroxy Vinylsilanes
作者:Guang-Li Xu、Zhong-Xia Wang
DOI:10.1021/acs.orglett.1c04141
日期:2022.1.21
Regioselective silylation of 2,3-allenols with disilanes was carried out under catalysis of Pd2dba3/P(o-MeOC6H4)3. In the presence of Cs2CO3, the reaction achieved 2-silyl-1,3-dienes. Reaction of 1-aryl-2,3-allenols gave the products with excellent Z/E selectivity and E-isomers as the major species. Reaction of α-alkylallenols or α-alkyl-α-aryl-allenols resulted in products with moderate Z/E selectivity
在 Pd 2 dba 3 /P( o -MeOC 6 H 4 ) 3的催化下,用乙硅烷对 2,3-丙二烯醇进行区域选择性甲硅烷基化。在Cs 2 CO 3存在下,反应得到2-甲硅烷基-1,3-二烯。1-aryl-2,3-allenols的反应得到具有优异Z / E选择性和E-异构体为主要种类的产物。α-烷基烯丙醇或 α-烷基-α-芳基烯丙醇的反应产生具有中等Z / E选择性和E-异构体也是主要的。在没有碱的情况下,该反应产生α-甲硅烷基-β-羟基乙烯基硅烷,其在用Cs 2 CO 3处理后转化为2-甲硅烷基-1,3-二烯。