Abstract
The combination of copper(I)-Taniaphos (5 mol%) is an efficient Lewis acid catalyst for the promotion of the asymmetric 1,3-dipolar cycloaddition of azomethine ylides to aryl vinyl sulfones, providing 3-sulfonylpyrrolidines in good yields and with nearly complete exo-selectivity and good enantiocontrol (typically 65-85% ee). The transformation of the cycloadducts into cis-2,5-disubstituted pyrrolidines of high enantiopurity (>99% ee) has been accomplished after simple recrystallization followed by N-methylation and subsequent reductive desulfonylation.
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