An efficient approach to construct 2-arylbenzo[b]furans from 2-methoxychalcone epoxides
作者:Libo Ruan、Min Shi、Shiwei Mao、Lifang Yu、Fan Yang、Jie Tang
DOI:10.1016/j.tet.2013.12.050
日期:2014.2
An efficient and practical method for construction of 2-arylbenzo[b]furans from 2-methoxychalcone epoxides has been reported. Catalyzed by 2 mol % of BF3·Et2O, 2-methoxychalcone epoxides went through the Meerwein rearrangement, followed by deformylation in one-pot to successfully afforded 2-methoxydeoxybenzoins. Afterward, 2-arylbenzo[b]furans were obtained in high yields (87%–100%) via intermolecular
已经报道了由2-甲氧基查耳酮环氧化物构造2-芳基苯并[ b ]呋喃的有效方法。2-甲氧基查尔酮环氧化物在2 mol%的BF 3 ·Et 2 O催化下进行Meerwein重排,然后在一锅中进行甲酰化反应,成功制得2-甲氧基脱氧安息香素。之后,通过2-甲氧基脱氧安息香与48%HBr的分子间环脱水,获得了高收率(87%–100%)的2-芳基苯并[ b ]呋喃。利用这种方法,可以方便地合成天然产物呋喃喃甲酸酯A和类花生四烯酸类化合物6的关键中间体。