[8+2] Cycloadditions of 2,4,6-Cycloheptatriene-1-imines with Chloroketenes: Facile and High-Yield One-Pot Synthesis of 1-Azaazulen-2(1<i>H</i>)-ones
作者:Kazuaki Ito、Katsuhiro Saito、Kensuke Takahashi
DOI:10.1246/bcsj.65.812
日期:1992.3
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。