The Palladium-Catalyzed Trifluoromethylation of Vinyl Sulfonates
摘要:
A method for the palladium-catalyzed trifluoromethylation of cyclohexenyl sulfonates has been developed. Various cyclohexenyl triflates and nonaflates underwent trifluoromethylation under mild reaction conditions using a catalyst system composed of Pd(dba)(2) or [(ally1)PdCl](2) and the monodentate biaryl phosphine ligand (t)BuXPhos. The trifluoromethyl anion (CF3-) or its equivalent for the process was generated in situ from TMSCF3 in combination with KF or TESCF3 in combination with RbF.
Palladium-Catalyzed Completely Linear-Selective Negishi Cross-Coupling of Allylzinc Halides with Aryl and Vinyl Electrophiles
作者:Yang Yang、Thomas J. L. Mustard、Paul Ha-Yeon Cheong、Stephen L. Buchwald
DOI:10.1002/anie.201308585
日期:2013.12.23
Completely linear: The title reaction provides an effective means to access a wide range of prenylated arenes and “skipped dienes” in a completely linear‐selective fashion, as demonstrated by a concise synthesis of the anti‐HIV natural product siamenol. DFT calculations shed light on the origin of the excellent regioselectivity observed with the current Pd‐based catalyst system.
完全线性:标题反应提供了一种有效的方法,可以以完全线性选择性的方式获得广泛的异戊二烯化芳烃和“跳过的二烯”,如抗 HIV 天然产物 siamenol 的简明合成所证明的那样。DFT 计算揭示了当前 Pd 基催化剂体系观察到的优异区域选择性的起源。
Pd-catalyzed cross-coupling of polyfluoroarenes with cyclic vinyl triflates
作者:YanBo Yu、Zhen Wang、XinGang Zhang
DOI:10.1007/s11426-013-5024-4
日期:2014.2
An effective method for Pd-catalyzed cross-coupling between polyfluoroarenes and cyclic vinyl triflates has been developed. This protocol provides a useful and facile access to polyfluoroarylated cyclic alkenes that are difficult to prepare otherwise. The advantages of this method are its high efficiency and operational simplicity.