Cu(I)/DTBM-BIPHEP-catalyzed exo-selective 1,3-dipolar cycloaddition of azomethine ylides with cis-trifluorocrotonate for asymmetric construction of trifluoromethylated pyrrolidines

Abstract A direct and facile access to highly substituted exo -pyrrolidines bearing a unique trifluoromethyl group is developed via Cu(I)/DTBM-BIPHEP-catalyzed asymmetric 1,3-dipolar cycloaddition of azomethine ylides with cis -4,4,4-trifluorocrotonate for the first time.