- A recyclable fluorous (S)-pyrrolidine sulfonamide promoted direct, highly enantioselective Michael addition of ketones and aldehydes to nitroolefins in water.
A recyclable fluorous (S)-pyrrolidine sulfonamide promoted direct, highly enantioselective Michael addition of ketones and aldehydes to nitroolefins in water.
Organic letters (2006-06-30)
Liansuo Zu, Jian Wang, Hao Li, Wei Wang
PMID16805556
RESUMO
[reaction: see text] A recycle and reusable fluorous (S)-pyrrolidine sulfonamide organocatalyst has been developed for promoting highly enantio- and diastereoselective Michael addition reactions of ketones and aldehydes with nitroolefins in water. The organocatalyst is conveniently recovered from the reaction mixtures by fluorous solid-phase extraction and can be subsequently reused (up to six cycles) without a significant loss of catalytic activity and stereoselectivity.