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Organocatalytic enantioselective indole alkylations of α,β-unsaturated ketones†
Wei Chen,Wei Du,Lei Yue,Rui Li,Yong Wu,Li-Sheng Ding
Organic & Biomolecular Chemistry Pub Date : 01/19/2007 00:00:00 , DOI:10.1039/B616504D
Abstract

The C3-selective enantioselective Michael-type Friedel–Crafts alkylations of indoles with nonchelating α,β-unsaturated alkyl ketones, catalysed by a chiral primary amine derived from natural cinchonine, were investigated. The reactions, in the presence of 30 mol% catalyst, were smoothly conducted at 0 to −20 °C. Moderate to good ee (47–89%) has been achieved.

Graphical abstract: Organocatalytic enantioselective indole alkylations of α,β-unsaturated ketones
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