Intramolecular cyclization of ortho-(cyclohex-2-enyl) anilines synthesis of ellipticine
作者:A. G. Mustafin、I. N. Khalilov、E. V. Tal'vinskii、I. B. Abdrakhmanov、L. V. Spirikhin、G. A. Tolstikov
DOI:10.1007/bf00630657
日期:1992.9
method is proposed for the synthesis of the alkaloid ellipticine, which possesses a pronounced antitumoral activity. The interaction of 3-bromocyclohexene (1 equiv.) and 2,5-xylylidine (4 equiv., 150°C, 5 h) gave a mixture of hexa- and tetrahydrocarbazoles which was dehydrogenated in the presence of Pd/C to the key synthon 1,4-dimethylcarbazole. The formylation of the carbazole by the Vilsmeier-Haack reaction
提出了一种合成具有显着抗肿瘤活性的生物碱玫瑰树碱的简便方法。3-溴环己烯(1 当量)和 2,5-二甲苯胺(4 当量,150°C,5 小时)的相互作用产生六和四氢咔唑的混合物,在 Pd/C 存在下脱氢成为关键合成子 1,4-二甲基咔唑。通过 Vilsmeier-Haack 反应对咔唑进行甲酰化、与 2,2-二乙氧基乙胺的相互作用以及在雷尼镍上形成的亚胺的还原导致 3-(2,2-二乙氧基乙基氨基甲基)-1,4-二甲基咔唑,沸腾其 N-甲苯磺酸盐以高产率得到玫瑰树碱。