Brønsted acid ionic liquid catalyzed facile synthesis of 3-vinylindoles through direct C3 alkenylation of indoles with simple ketones

Literature Information

Publication Date 2014-05-27
DOI 10.1039/C4GC00840E
Impact Factor 10.182
Authors

Amir Taheri, Changhui Liu, Bingbing Lai, Cheng Cheng, Xiaojuan Pan


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Abstract

A direct dehydrative coupling protocol for the synthesis of 3-vinylindoles using easily available indoles and simple ketones as substrates was developed with the aid of a sulfonyl-containing Brønsted acid ionic liquid. The salient features of this protocol are high synthetic efficiency, a metal- and solvent-free system, a recyclable catalyst, mild conditions and easy product isolation. With the ionic liquid catalyst, a hitherto unreported straightforward method for the construction of the indolo[3,2-b]carbazole skeleton was also developed using 2-hydroxymethylindole and acetophenone as starting materials.

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