Efficient total synthesis of neocryptolepine and synthetic access to 6-methylquinindoline from a common intermediate
作者:María V. Méndez、Daniel A. Heredia、Enrique L. Larghi、Andrea B. J. Bracca、Teodoro S. Kaufman
DOI:10.1039/c7ra05349e
日期:——
A convenient approach toward the indoloquinolines neocryptolepine and 6-methylquinindoline from a common intermediate, is reported. Both sequences, designed for maximum use of accessible reagents and robust conditions, are straightforward and efficient. They involved the amidation of 2-aminobenzaldehyde (prepared by iron-mediated reduction of 2-nitrobenzaldehyde) with 2-nitrophenylacetic acid, followed
据报道,从常见的中间体向吲哚喹啉新隐油菜碱和6-甲基喹啉有一种简便的方法。两种序列均旨在最大程度地利用可及的试剂和稳定的条件,因此既简单又有效。他们涉及用2-硝基苯基乙酸酰胺化2-氨基苯甲醛(通过铁介导的还原2-硝基苯甲醛制备),然后用K 2 CO 3辅助环化形成3-(2-硝基苯基)喹啉-2-一个作为共同的先驱。Me 2 CO 3介导的内酰胺的N-甲基化,硝基部分的还原和最终环化导致新隐油菜籽的总收率为55%,而环缩合和N-甲基化得到6-甲基喹啉的总产率为79%。因此,朝向靶标的序列需要进行两次POCl 3促进的C–N键形成反应,两次Fe介导的硝基还原和两次碱基促进的转化。