A better route to hydrocarbazoles

A better route to hydrocarbazoles

(Phys.org) —A new chemical process developed by researchers at Kanazawa University provides an efficient way of synthesizing diverse organic compounds. This research is also described in the inaugural June 2013 issue of the Kanazawa University Research Bulletin: www.kanazawa-u.ac.jp/research_bulletin/index.html

Jun-ichi Matsuo and co-workers in the School of aimed to produce a wide variety of called hydrocarbazoles, which are found in many such as strychnine. Hydrocarbazoles contain a benzene ring linked by a six-membered carbon ring and a five-membered carbon ring containing nitrogen.

Various methods exist for synthesizing hydrocarbazoles by reacting electron-accepting compounds, called enophiles, with indoles – common aromatic structures that are found in flower scents. Because this reaction involves the addition of a cyclic carbon ring, it is called cycloaddition.

Previous cycloaddition methods have been restricted to certain combinations of indoles and enophiles. Moreover, it has been difficult to control exactly where on the molecules the bonds will be formed, and thus what exact chemical structure will come out.

The new process developed by Matsuo and co-workers involves a reaction of cyclobutanones with so-called Lewis acids – molecules that can accept two electrons - to produce an intermediary molecule that has positively- and negatively-charged parts, but zero charge overall. This intermediary can react with many different indoles to produce hydrocarbazoles.

The choice of indole can lead to different types and structures of hydrocarbazoles. So far, the researchers have synthesized structural parts of strictamine molecules, and demonstrated total synthesis of aspidospermidine. Such an efficient, flexible route to these useful could greatly benefit pharmaceuticals and other industries.


Explore further

Fused indolines made by asymmetrical carbon-carbon coupling

More information: Kawano, M. Regioselective Inter- and Intramolecular Formal [4+2] Cycloaddition of Cyclobutanones with Indoles and Total Synthesis of (±)-Aspidospermidine, Angewante Chemistry Int. Ed. 52 (2013).
Citation: A better route to hydrocarbazoles (2013, June 25) retrieved 23 August 2019 from https://phys.org/news/2013-06-route-hydrocarbazoles.html
This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.
0 shares

Feedback to editors

User comments

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more