Chemoselective cyclizations of 1,3-dicarbonyl compounds with hydroxyketones for the selective formation of two 2,3,5-trisubstituted furans have been reported. While TsOH-mediated cyclization in DCM afforded 2-acylfurans, the additional copper catalyst in acetone turned over the selectivity for the generation of 3-acylfurans. The featured advantages of both reactions include simple conditions, high
已经报道了 1,3-二羰基化合物与羟基酮的
化学选择性环化,以选择性形成两个 2,3,5-三取代
呋喃。虽然 DCM 中 TsOH 介导的环化反应生成 2-酰基
呋喃,但
丙酮中额外的
铜催化剂却改变了 3-酰基
呋喃生成的选择性。两种反应均具有条件简单、收率高、底物范围广、克数可扩展、副产物为H 2 O等特点。