electrophilic catalysis avoiding reaction of the lactone function. The azadiene system in the 3-substituted 5-chloro-6-methyl-2H-1,4-oxazin-2-ones is shown to react easily with monosubstituted acetylenic compounds yielding polyfunctionalized pyridines in excellent yield via a cycloaddition-elimination process. The usually high regioselectivity and its dependence on the nature of the 3-substituent is discussed
通常在适当的条件下,通过亲电催化避免内酯功能的反应,在3,5-二
氯-6-甲基-2 H -1,4-恶嗪-2-酮中实现
氯亚胺基的选择性官能化。已表明3-取代的5-
氯-6-甲基-2 H -1,4-恶嗪-2-酮中的氮杂二烯体系易于与单取代的炔属化合物反应,并通过环加成消除法以优异的收率得到多官能化
吡啶。讨论了通常较高的区域选择性及其对3-取代基性质的依赖性。