New versatile syntheses of 3-aminoisoxazoles and their derivatives are described. 3-(N, N-Disubstituted amino) isoxazoles 5 were synthesized by heating 3-chloro-2-methylisoxazolium chlorides 1 with secondary amines, or by the substitution reaction of 1 with primary amines, followed by the dehydrochlorination and the subsequent addition-elimination reaction of alkyl or acyl halides with the resulting imines 6. Among the products 5, 3-(N-substituted acetylamino) isoxazoles were hydrolyzed with base to give 3-(N-monosubstituted amino) isoxazoles 3. 3-Aminoisoxazoles 7 were synthesized by the reaction of 1 with potassium phthalimide, followed by treatment with hydrazine.
新的3-
氨基
异噁唑及其衍
生物的多功能合成方法被报道。3-(N,N-二取代
氨基)
异噁唑5通过加热3-
氯-2-甲基
异噁唑盐酸盐1与二级胺,或通过1与一级胺的取代反应,随后经过脱
氯化氢及后续的烷基或酰基卤化物与生成的
亚胺6的加成-消除反应合成。在产物5中,3-(N-取代乙酰
氨基)
异噁唑经碱
水解得到3-(N-单取代
氨基)
异噁唑3。3-
氨基
异噁唑7通过1与邻苯二甲
酰亚胺钾的反应,随后用
肼处理合成。