Facile synthesis of sulfenyl-substituted isocoumarins, heterocycle-fused pyrones and 3-(inden-1-ylidene)isobenzofuranones by FeCl3-promoted regioselective annulation of o-(1-alkynyl)benzoates and o-(1-alkynyl)heterocyclic carboxylates with disulfides
作者:Zhen Li、Jianquan Hong、Linhong Weng、Xigeng Zhou
DOI:10.1016/j.tet.2011.12.003
日期:2012.2
Reported herein is the FeCl3-promoted intermolecular sulfoesterification of o-(1-alkynyl)benzoates with disulfides, which provides a convenient and efficient method for synthesis of 4-sulfenylisocoumarins. Various functional groups such as methoxy, halides, ester, cyano and silicon groups in the substrates are tolerated, and heterocycle-fused chalcogenylpyrones are also successfully achieved directly
本文报道的是FeCl 3促进的邻-(1-炔基)苯甲酸酯与二硫化物的分子间磺基酯化,其提供了合成4-亚硫基异香豆素的方便而有效的方法。可以耐受底物中的各种官能团,例如甲氧基,卤化物,酯,氰基和硅基团,并且在相同的反应条件下,还可以直接从相应的杂环前体成功地实现杂环稠合的硫属酰基吡喃酮。另外,从二炔基苯甲酸酯开始,该反应序列可以与双环化步骤结合,从而得到具有高区域特异性和排他立体选择性的四环(E)-3-(2-苯基-3-苯基硫族y基-亚基-1,1-亚乙基)异苯并呋喃酮骨架。