| Abstract
| - Herein we wish to report our development of an improvedcatalyst (S)-(-)-indoline-2-yl-1H-tetrazole (1) for the enantioselective organocatalyzed cyclopropanation of α,β-unsaturated aldehydes with sulfur ylides. The new organocatalyst readily facilitates the enantioselective organocatalyticcyclopropanation, providing cyclized product in excellentdiastereoselectivities ranging from 96% to 98% along withenantioselectivities exceeding 99% enantiomeric excess forall reacted α,β-unsaturated aldehydes. The new catalystprovides the best results so far reported for intermolecularenantioselective organocatalyzed cyclopropanation.
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