Simple heating of mixtures of N-arylcycloheptatriene-1-imines and acyl chlorides in the presence of an excess amount of triethylamine afforded 1-azaazulen-2(1H)-ones in high yields. The intermediacy of the [8+2] cycloadducts between the 2,4,6-cycloheptatriene-1-imines and ketenes were confirmed by their isolations. Analogous results were obtained with tropone hydrazones.
在过量
三乙胺的存在下简单加热 N-芳基
环庚三烯-1-
亚胺和酰
氯的混合物,以高产率得到 1-氮杂氮杂-2(1H)-酮。2,4,6-
环庚三烯-1-
亚胺和烯酮之间的 [8+2] 环加合物的中间体通过它们的分离得到证实。用托酮腙获得了类似的结果。