A convenient synthesis of 1, 2, 3, 4, 6, 7, 12, 12b-octahydroindolo [2, 3-a] quinolizine (1) is described. The condensation of tryptamine (2) with diethyl (2-formylethyl) malonate (3a), followed by treatment with alkali, gave the lactam ester (5a). Decarbethoxylation of 5a with LiCl-H2O-Me2SO afforded the lactam (8a), which was reduced with LiAlH4 to give the indoloquinolizine (1). The lactam (8b) which has an ethyl group at C3 was prepared from tryptamine (2) and diethyl ethyl (2-formylethyl) malonate (3b) instead of 3a.
本文描述了 1, 2, 3, 4, 6, 7, 12, 12b-octahydroindolo [2, 3-a] quinolizine (1) 的简便合成方法。
色胺(2)与(2-甲酰乙基)
丙二酸二乙酯(3a)缩合,然后用碱处理,得到内酰胺酯(5a)。用 LiCl-
H2O-Me2SO 对 5a 进行脱甲氧基反应,得到内酰胺 (8a),再用 LiAlH4 还原,得到
吲哚喹嗪 (1)。用
色胺(2)和(2-甲酰乙基)
丙二酸二乙酯(3b)代替 3a,制备出 C3 位有乙基的内酰胺(8b)。