Direct synthesis of 3-arylpropionic acids by tetraphosphine/palladium catalysed Heck reactions of aryl halides with acrolein ethylene acetal
作者:Mhamed Lemhadri、Henri Doucet、Maurice Santelli
DOI:10.1016/j.tet.2004.09.061
日期:2004.12
4-tetrakis(diphenylphosphinomethyl)cyclopentane as a catalyst, a range of aryl bromides undergoes Heck reaction with acrolein ethylene acetal. With this acetal, the selective formation of 3-arylpropionic acids/esters was observed. The functional group tolerance on the aryl halide is remarkable; substituents such as fluoro, methyl, methoxy, acetyl, formyl, benzoyl, nitro or nitrile are tolerated. Furthermore
通过使用[的PdCl(C的3 ħ 5)] 2 /顺式,顺式,顺式-1,2,3,4-四(二苯基膦基)环戊烷作为催化剂,范围芳基溴化物的经历的Heck与丙烯醛乙缩醛反应。用这种缩醛,观察到3-芳基丙酸/酯的选择性形成。芳基卤对官能团的耐受性显着;可以容忍诸如氟,甲基,甲氧基,乙酰基,甲酰基,苯甲酰基,硝基或腈之类的取代基。此外,该催化剂即使在位阻芳基溴的反应中也可以低负荷使用。