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.
报道了用于合成
生物碱aaptamine的前体物质6,7-二甲氧基-1-甲基-
8-硝基异喹啉和6,7-二甲氧基-
1-甲基异喹啉的制备方法。该方法基于特定区域的电环化反应,利用适当的β-芳基
乙烯基烯胺,该烯胺可通过相应的
乙烯亚胺磷烷与(三甲基
硅基)
乙烯酮的aza-Wittig反应获得。