Regiospecific Electrocyclization of β-Arylvinyl Ketenimines. Formal Syntheses of the Alkaloid from Marine Origin Aaptamine
作者:Pedro Molina、Angel Vidal、Isidora Barquero
DOI:10.1055/s-1996-4367
日期:1996.10
Preparation of 6,7-dimethoxy-1-methyl-8-nitroisoquinoline and 6,7-dimethoxy-1-methylisoquinoline, used as precursors in the synthesis of the alkaloid aaptamine, is reported. The method is based on the regiospecific electrocyclization of the appropriate β-arylvinyl ketenimine available by aza-Wittig reaction of the corresponding vinyl iminophosphorane with (trimethylsilyl)ethenone.