Erratum: Oxazaborolidinium Ion-Catalyzed Cyclopropanation of α-Substituted Acroleins: Enantioselective Synthesis of Cyclopropanes Bearing Two Chiral Quaternary Centers (J. Am. Chem. Soc. (2011) 133:51 (20708−20711) DOI: 10.1021/ja209270e)

Pages 20709 and 20710. In the published version of the paper, the trans:cis ratios of 2w and 2x were reversed. The revised results were confirmed by NOE experiments and comparison of the optical rotation data with reported values after transformation. The corrected Table 3 is presented below. This correction does not affect the conclusion of the paper. In the Supporting Information file presenting experimental details, the absolute configurations of 2w and 2x were incorrectly drawn as (1R,2R) (pages S26−S28). The corrected file, available here, depicts the (1S,2R) configurations.