Alkylation of methyl 2-hydroxyphenylcarbamates with 1,2-dibromoethane in acetone in the presence of K2CO3 gave the corresponding methyl 6(7)-R-2,3-dihydro-4H-1,4-benzoxazine-4-carboxylate. Alkylation of methyl 2-hydroxyphenylcarbamates with chloromethyloxirane was accompanied by recyclization of the oxirane ring with formation of methyl 6(7)-R-3-hydroxymethyl-2,3-dihydro-4H-1,4-benzoxazine-4-carboxylates.
在 K2CO3 的存在下,2-羟基苯基
氨基甲酸甲酯在
丙酮中与
1,2-二溴乙烷发生烷基化反应,生成相应的 6(7)-R-2,3-二氢-4H-1,4-苯并恶嗪-4-
羧酸甲酯。2- 羟基苯基
氨基甲酸甲酯与
氯甲基
环氧乙烷发生烷基化反应,同时
环氧乙烷环发生再
化学反应,生成 6(7)-R-3- 羟甲基-2,3-二氢-4H-1,4-苯并恶嗪-4-
羧酸甲酯。