Intramolecular Catalyst Transfer on a Variety of Functional Groups between Benzene Rings in a Suzuki–Miyaura Coupling Reaction
作者:Tsutomu Yokozawa、Natsumi Harada、Hajime Sugita、Yoshihiro Ohta
DOI:10.1002/chem.201902044
日期:2019.8
Suzuki–Miyaura coupling reaction of BrC6H4‐X‐C6H4Br 1 (X=CH2, CO, N‐Bu, O, S, SO, and SO2) with arylboronic acid 2 was investigated in the presence of tBu3PPd precatalyst and CsF/[18]crown‐6 as a base to establish whether or not the Pd catalyst can undergo catalyst transfer on these functional groups. In the reaction of 1 (X=CH2, CO, N‐Bu, O, and SO2) with 2, aryl‐disubstituted product 3 (Ar‐C6H4‐X‐C6H4‐Ar)
BRC的铃木-宫浦偶合反应6 ħ 4 -X-C 6 H ^ 4溴1(X = CH 2,CO,Ñ -Bu,O,S,SO和SO 2)与芳基硼酸2是在存在调查以t Bu 3 PPd预催化剂和CsF / [18] crown-6为基础确定Pd催化剂是否可以在这些官能团上进行催化剂转移。在1(X = CH 2,CO,N- Bu,O和SO 2)与2的反应中,芳基二取代的产物3(Ar-C仅获得了6 H 4 -X-C 6 H 4 -Ar),这表明Pd催化剂在这些官能团上进行了催化剂转移。另一方面,1 e(X = S)和1 f(X = SO)与2的反应仅提供芳基单取代的产物4(Ar‐C 6 H 4 ‐X‐C 6 H 4 ‐ Br)和分别为3和4的混合物,表明S和SO干扰了分子内催化剂的转移。此外,我们发现1(X = CH 2,CO,Ñ -Bu,O,和SO 2)和phenylenediboronic酸5在存在