Construction of chiral α-tert-amine scaffolds via amine-catalyzed asymmetric Mannich reactions of alkyl-substituted ketimines. Issue 4 (9th December 2020) - Homma, Chihiro
Abstract : Stereoselective Mannich reactions of aldehydes with ketimines provide chiral β-amino aldehydes that bear an α- tert -amine moiety. Abstract : Stereoselective Mannich reactions of aldehydes with ketimines provide chiral β-amino aldehydes that bear an α- tert -amine moiety. However, the structural variation of the ketimines is limited due to the formation of inseparable E / Z isomers, low reactivity, and other synthetic difficulties. In this study, a highly diastereodivergent synthesis of hitherto difficult-to-access β-amino aldehydes that bear a chiral α- tert -amine moiety was achieved using the amine-catalyzed Mannich reactions of aldehydes with less-activated Z -ketimines that bear both alkyl and alkynyl groups.