A new reaction mode for the formation of pyrimidine derivatives by the reaction of 4-chloro-2H-1, 3-benzoxazines (1a-f) with ethyl 3-aminobutyrate is described. Treatment of chlorobenzoxazines (1a-f) with ethyl 3-aminobutyrate (2) gave pyrimidine derivatives (4a-f) possessing an o-hydroxyphenyl substituent. When 4-chloro-2-methyl-2-methoxycarbonylmethyl-2H-1, 3-benzoxazine (1g) was treated with 2, a pyrimidinone derivative (7) was isolated. A possible mechanism for the formation of these reaction products is discussed.
描述了一种新反应模式,通过4-
氯-2H-1,3-苯并噁嗪(1a-f)与乙基3-
氨基
丁酸酯的反应形成
嘧啶衍
生物。将
氯苯并噁嗪(1a-f)与乙基3-
氨基
丁酸酯(2)处理,得到具有o-羟基苯基取代基的
嘧啶衍
生物(4a-f)。当4-
氯-2-甲基-2-甲氧基羧基甲基-2H-1,3-苯并噁嗪(1g)与2反应时,分离出一种
嘧啶酮衍
生物(7)。讨论了这些反应产物形成的可能机制。