Direct-type vinylogous Mukaiyama-Michael addition reactions involving pyrrolinone donors

The direct Mukaiyama-Michael addition of vinylogous tetramate donors to a number of different Michael
acceptors has been easily executed, by employing the TMSOTf/Et3N mixture as soft Lewis acid/base
promoter agent. Richly functionalized, highly manipulable g-substituted pyrrolinone products were
practically synthesized in acceptable to excellent yields, and with diastereoselectivities heavily relying
upon the substituent at the nitrogen atom of the pyrrolinone donor.