A straightforward preparation of benz[f]indoles by an intramolecular diels-alder cycloaddition of unsaturated ketenimines.
作者:Pedro Molina、Carmen López-Leonardo、Julián Alcántara
DOI:10.1016/s0040-4020(01)90414-4
日期:1994.4
An intramolecular Diels-Alder cycloaddition of de ketenimines 3, available by aza Wittig reaction between iminophosphoranes 2, derived from azido olefins 1, and diaryl ketenes followed by an oxidative aromatization of the cycloadduct provided benz[f]indoles 5. Attempts to apply this process either with ethylphenylketene, 5-aryl-4-pentenylazides or with the related carbodiimides failed.
酮亚胺3的分子内Diels-Alder环加成反应可通过衍生自叠氮烯烃1的亚氨基膦2与二芳基烯酮通过aza Wittig反应获得,然后对环加合物进行氧化芳构化得到苯并[ f ]吲哚5。尝试将这种方法与乙基苯基乙烯酮,5-芳基-4-戊烯叠氮化物或相关的碳二亚胺一起应用的尝试失败了。