An approach to 2-cyanopyrrolidines bearing a chiral auxiliary
摘要:
The reaction of 2-methyl-2-(1-phenylethyl)amino)propanenitrile with different gamma-halocarbonyl compounds is investigated. The influence of different parameters such as the nature of the substrate and solvent, is discussed. The reaction is considered as a convenient route to 2-cyanopyrrolidines in the case of aliphatic gamma-halocarbonyl compounds possessing a reasonably reactive carbonyl group. In many cases, the products can be obtained as single enantiomers. It is shown that cyclopropyl ketones can also react with 2-methyl-2-((1-phenylethyl)amino)propanenitrile to give 2-cyanopyrrolidines. A mechanistic scheme is proposed in order to explain the experimental facts observed. (c) 2007 Elsevier Ltd. All rights reserved.