Acylation of aromatic ethers over solid acid catalysts: scope of the reaction with more complex acylating agents
作者:Keith Smith、Gamal A. El-Hiti、Anthony J. Jayne、Michael Butters
DOI:10.1039/b303906d
日期:——
Acylation of anisole with 2-phenylbutanoic acid derivatives, over zeolite catalysts, gives the corresponding 4-acyl derivatives with high regioselectivity. In an analogous way, 2,3-dihydrobenzofuran reacts with acid anhydrides or chlorides in the presence of catalytic quantities of zeolites to give the corresponding 5-acyl-2,3-dihydrobenzofurans. The zeolite can be recovered, regenerated and used again to give almost the same yield as with fresh zeolite. The reaction has been applied to the synthesis of ethyl (2,3-dihydrobenzofuran-5-yl)glyoxylate.
在沸石催化剂的作用下,苯甲醚与 2-苯基丁酸衍生物发生酰化反应,可得到具有高区域选择性的相应 4-酰基衍生物。类似地,2,3-二氢苯并呋喃与酸酐或氯化物在沸石催化下发生反应,生成相应的 5-酰基-2,3-二氢苯并呋喃。沸石可以回收、再生和再次使用,其产量几乎与新鲜沸石相同。该反应已用于合成 (2,3-二氢苯并呋喃-5-基) 乙醛酸乙酯。