Attempted synthesis of ethyl 3,4-dihydro-2<i>H</i>-1,4-benzoxazine-3-carboxylate and 3-acetate derivatives
作者:Stanislas Mayer、Axelle Arrault、GÉRald Guillaumet、Jean-Yves Mérour
DOI:10.1002/jhet.5570380133
日期:2001.1
Ethyl 3,4-dihydro-2H-1,4-benzoxazine-3-carboxylate derivatives 2 were obtained and isolated in low yields from the condensation of 2-aminophenol and ethyl 2,3-dibromopropanoate. They can be obtained by hydrogenation of ethyl 2H-1,4-benzoxazine-3-carboxylate in satisfactory yield. Using 2-iminophenol did not direct the condensation with ethyl 2,3-dibromopropanoate towards 2 but was fruitfull for the
获得了3,4-二氢-2 H -1,4-苯并恶嗪-3-羧酸乙酯衍生物2,并从2-氨基苯酚和2,3-二溴丙酸乙酯的缩合中低收率分离。它们可以通过以令人满意的产率氢化2 H -1,4-苯并恶嗪-3-羧酸乙酯获得。使用2-亚氨基苯酚不会将与2,3-二溴丙酸乙酯的缩合反应直接引向2,但对于制备2-(4-苄基-3,4-二氢-2 H -1,4-苯并嗪-3-溴丁烯酸乙酯中的乙酸乙酯)。