Mechanistic Investigation of the Palladium-Catalyzed Synthesis of Allylic Silanes and Boronates from Allylic Alcohols
作者:Johanna M. Larsson、Kálmán J. Szabó
DOI:10.1021/ja309860h
日期:2013.1.9
The mechanism of the palladium-catalyzed synthesis of allylic silanes and boronates from allylic alcohols was investigated. (1)H, (29)Si, (19)F, and (11)B NMR spectroscopy was used to reveal key intermediates and byproducts of the silylation reaction. The tetrafluoroborate counterion of the palladium catalyst is proposed to play an important role in both catalyst activation as well as the transmetalation
研究了钯催化烯丙醇合成烯丙硅烷和硼酸酯的机理。(1)H、(29)Si、(19)F 和 (11)B NMR 光谱用于揭示硅烷化反应的关键中间体和副产物。钯催化剂的四氟硼酸盐反离子被认为在催化剂活化和金属转移步骤中都起着重要作用。我们建议 BF(3) 在这两个过程中生成,并负责底物羟基的激活。(η(3)-烯丙基) 钯配合物已被确定为催化剂静止状态,并且已经研究了直接从烯丙醇形成 (η(3)-烯丙基) 钯配合物。动力学分析提供了证据表明周转限制步骤是金属转移,