An “On-Cycle” Precatalyst Enables Room-Temperature Polyfluoroarylation Using Sensitive Boronic Acids
作者:Liye Chen、Haydn Francis、Brad P. Carrow
DOI:10.1021/acscatal.8b00341
日期:2018.4.6
fluorinated arylboronic acid building blocks in cross-coupling has remained challenging, because of their acute base sensitivity. We report a general solution to this problem using a true catalytic intermediate, Pd(PAd3)(p-FC6H4)Br, as a uniquely effective “on-cycle” precatalyst that allows Suzuki–Miyaura coupling to occur much faster than even the most severe protodeboronation side reactions. Control of boron
交叉偶联中使用氟化芳基硼酸结构单元仍然具有挑战性,因为它们具有敏锐的碱敏感性。我们报告了使用真正的催化中间体Pd(PAd 3)(p -FC 6 H 4)Br作为唯一有效的“循环”预催化剂,可以使Suzuki-Miyaura偶联发生的速度快得多的一般解决方案。即使是最严重的原去硼副反应。还发现控制活性酸形式和休眠酯形式之间的硼形态在平衡催化速率与试剂分解之间起着至关重要的作用。该方法与任何氟化模式,对碱不稳定的官能团以及一系列溴(杂)芳烃均兼容。
The palladium-catalysed cross-coupling reaction of lithium polyfluorophenyltrimethoxyborates with 4-fluoroiodobenzene
作者:Hermann-Josef Frohn、Nicolay Yu Adonin、Vadim V Bardin、Vladimir F Starichenko
DOI:10.1016/s0022-1139(03)00088-5
日期:2003.8
Li[C6F5B(OMe)(3)]. Li[C6HF4B(OMe)(3)] (all three isomers) and Li[3,4,5-C6H2F3B(OMe)(3)] are the first examples of polyfluorophenyltrimethoxyborate salts which have been applied as reagents to Pd-catalysed cross-coupling reactions. A series of polyfluorinated biphenyls C6H5-nFn-C6H4F-4' were obtained from Li[C6H5-nFnB(OMe)(3)] and the model substrate 4-FC6H4I in the presence of Pd catalysts. The influence of the number and the position of fluorine atoms in the polyfluorophenyltrimetboxyborate salts on the reactivity in the coupling reaction was elucidated. (C) 2003 Elsevier Science B.V. All rights reserved.