作者:Philip Duncanson、Yuen-Ki Cheong、Majid Motevalli、D. Vaughan Griffiths
DOI:10.1039/c2ob25314c
日期:——
A convenient route to isoindolo[2,1-a]indol-6-ones has been developed starting from the appropriate 2-(N-phthaloyl)benzoic acids. Formation of the acid chlorides with thionyl chloride followed by heating with triethyl phosphite in a suitable solvent resulted in a multistep reaction giving tetracyclic β-ketophosphonates that on reduction with sodium borohydride gave the required indolones in good overall
从合适的2-(N-邻苯二甲酰基)苯甲酸开始,已经开发出一种方便的方法制备异吲哚并[2,1 - a ]吲哚-6-酮。形成酰氯与亚硫酰氯 然后用 亚磷酸三乙酯 在合适的溶剂中进行多步反应,得到四环β-酮膦酸酯,将其还原为 硼氢化钠以良好的总收率获得了所需的吲哚酮。还从N,N-(1,8-萘基)-2-氨基苯甲酸和2-(2,5-二氧代-2,5-二氢-1 H-吡咯-1-基)开始制备类似的β-酮膦酸酯苯甲酸,尽管其中只有萘基产物可被还原硼氢化钠 而不在环系统中裂解酰胺键。