Synthesis of β-aryl ketones by tetraphosphine/palladium catalysed Heck reactions of 2- or 3-substituted allylic alcohols with aryl bromides
作者:Florian Berthiol、Henri Doucet、Maurice Santelli
DOI:10.1016/j.tet.2006.02.061
日期:2006.5
4-tetrakis(diphenylphosphinomethyl)cyclopentane as a catalyst, a range of aryl bromides undergoes Heck reaction using 2- or 3-subtituted allylic alcohols. With these sterically congested alkenes, the selective formation of β-aryl ketones was observed when appropriate reaction conditions were used. The influence of the functional group on the aryl bromide and of the base on the selectivity is remarkable. With several
通过使用[PdCl(C 3 H 5)] 2 /顺式,顺式,顺式,1,2,3,4-四(二苯基膦甲基)环戊烷作为催化剂,一系列芳基溴化物使用2-或2-羟基进行Heck反应。 3位取代的烯丙醇。对于这些空间上拥挤的烯烃,当使用适当的反应条件时,观察到β-芳基酮的选择性形成。官能团对芳基溴化物和碱对选择性的影响是显着的。使用几种底物,使用NaHCO 3代替K 2 CO 3可获得更高的选择性。作为基础。此外,该催化剂可在低负荷下与多种底物一起使用。