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The first enantioselective [3 + 2] annulation of α-substituted allenoates with β,γ-unsaturated N-sulfonylimines is described. In the presence of a dipeptide phosphine catalyst, a wide range of highly functionalized cyclopentenes bearing an all-carbon quaternary center were obtained in moderate to good yields and with good to excellent enantioselectivities.

beilstein journal of organic chemistry

Enantioselective [3 + 2] annulation of α-substituted allenoates with β,γ-unsaturated <i>N</i>-sulfonylimines catalyzed by a bifunctional dipeptide phosphine

Enantioselective [3 + 2] annulation of α-substituted allenoates with β,γ-unsaturated N-sulfonylimines catalyzed by a bifunctional dipeptide phosphine