Modifications to the Vilsmeier-Haack formylation of 1,4-dimethylcarbazole and its application to the synthesis of ellipticines
作者:Fiona M. Deane、Charlotte M. Miller、Anita R. Maguire、Florence O. McCarthy
DOI:10.1002/jhet.598
日期:2011.7
An improved method for the preparation of 3‐formyl‐1,4‐dimethylcarbazole, a key intermediate in the synthesis of ellipticine, is presented. Conditions of the Vilsmeier‐Haack reaction have been modified to facilitate the production of 3‐formyl‐1,4‐dimethylcarbazole as a major product leading to an overall improvement in yield of ellipticine from 3% to 14%. This approach was also applied to the synthesis
提出了一种制备玫瑰树碱关键中间体3-甲酰基-1,4-二甲基咔唑的改进方法。修改了Vilsmeier-Haack反应的条件,以促进生产作为主要产品的3-甲酰基-1,4-二甲基咔唑,使玫瑰树碱的总产率从3%提高到14%。这种方法也适用于6-甲基玫瑰树碱和9-甲氧基玫瑰树碱的合成。J.杂环化学。(2011)。