Suzuki Coupling of Cyclopropylboronic Acid With Aryl Halides Catalyzed by a Palladium–Tetraphosphine Complex
作者:Mhamed Lemhadri、Henri Doucet、Maurice Santelli
DOI:10.1080/00397910500330833
日期:2006.2
Abstract The tetraphosphine all‐cis‐1,2,3,4‐tetrakis(diphenylphosphinomethyl)cyclopentane (Tedicyp) in combination with [Pd(C3H5)Cl]2 affords a very efficient catalyst for the coupling of cyclopropylboronic acid with aryl bromides and aryl chlorides. Higher reactions rates were observed with aryl bromides than with aryl chlorides; however, even in the presence of 1–0.4% of catalyst, a few aryl chlorides
摘要 四膦全顺式 1,2,3,4-四(二苯基膦甲基)环戊烷 (Tedicyp) 与 [Pd(C3H5)Cl]2 结合为环丙基硼酸与芳基溴化物和芳基芳基的偶联提供了一种非常有效的催化剂。氯化物。使用芳基溴比使用芳基氯观察到更高的反应速率;然而,即使在 1-0.4% 的催化剂存在下,少量芳基氯也能以良好的产率得到偶联产物。可以容忍芳基卤化物上的各种取代基,例如烷基、甲氧基、三氟甲基、乙酰基、苯甲酰基、甲酰基、羧酸盐、硝基和腈。空间上非常拥挤的芳基溴化物如溴代三甲苯或 2,4,6-三异丙基溴苯的偶联反应也以良好的产率进行。