Reactions of 3-oxo-2,3-dihydrobenzofuran with alkyl 2-cyano-3-alkoxypropenoate and alkyl 2-alkoxycarbonyl-3-alkoxypropenoate. Synthesis of pyran derivatives
作者:J. Y. Mérour、F. Cossais
DOI:10.1002/jhet.5570280813
日期:1991.12
3-Oxo-2,3-dihydrobenzofuran reacted with ethyl 2-cyano-3-ethoxypropenoate, methyl 2-cyano-3-methoxy-propenoate affording compounds 3 (2-(2-cyano-2-alkoxycarbonylvinyl)-3-hydroxybenzofuran) obtained as a mixture of Z + E isomers. Methyl 2-methoxycarbonyl-3-methoxypropenoate gave compound 4. Malonic compounds added on 2-dimethylaminomethylene-3-oxo-2,3-dihydrobenzofuran 6 for giving compound 3 or 2-
3-Oxo-2,3-二氢苯并呋喃与2-氰基-3-乙氧基丙酸乙酯,2-氰基-3-甲氧基丙酸甲酯反应生成化合物3(2-(2-氰基-2-烷氧基羰基乙烯基)-3-羟基苯并呋喃)以Z + E异构体的混合物形式获得。2-甲氧基羰基-3-甲氧基丙酸甲酯得到化合物4。在2-二甲基氨基亚甲基-3-氧代-2,3-二氢苯并呋喃6上添加丙二酸化合物以得到化合物3或2-氧代-3-甲氧基羰基-2 H-吡喃并[3,2- b ]苯并呋喃8。还通过在二甲苯中加热化合物4来获得化合物8。