Direct Synthesis of Protected Arylacetaldehydes by Tetrakis(phosphane)palladium-Catalyzed Arylation of Ethyleneglycol Vinyl Ether
作者:Isabelle Kondolff、Henri Doucet、Maurice Santelli
DOI:10.1002/ejoc.200500540
日期:2006.2
A range of aryl bromides undergo Heck reaction with ethylene glycol vinyl ether, in the presence of [PdCl(C3H5)]2/cis,cis,cis-1,2,3,4-tetrakis[(diphenylphosphanyl)methyl]cyclopentane as catalyst, to give regioselectively protected arylacetaldehydes in good yields. The β-arylation products were obtained in with 93–100 % selectivity with electron-poor aryl bromides or heteroaryl bromides. Furthermore
在[PdCl(C3H5)]2/cis,cis,cis-1,2,3,4-四[(二苯基膦基)甲基]环戊烷作为催化剂存在下,一系列芳基溴化物与乙二醇乙烯基醚发生Heck反应,以良好的产率得到区域选择性保护的芳基乙醛。用缺电子的芳基溴化物或杂芳基溴化物以 93-100% 的选择性获得 β-芳基化产物。此外,该催化剂可以在低负载下使用,甚至用于与位阻芳基溴化物的反应。芳基乙烯基醚中间体经过随后的缩酮化得到相应的 2-苄基-1,3-二氧戊环衍生物。 (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)