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Soc."},{"key":"ref8\/cit8b","doi-asserted-by":"crossref","first-page":"9874","DOI":"10.1021\/ja005517p","volume":"122","author":"Jen W. S.","year":"2000","journal-title":"J. Am. Chem. Soc."},{"key":"ref9\/cit9","unstructured":"For example, a catalyst related to6d(Table1) but bearing the free OH gave the product with 15% ee (see theSupporting Information)."},{"key":"ref10\/cit10","doi-asserted-by":"crossref","first-page":"1129","DOI":"10.1021\/ol050123u","volume":"7","author":"Yoo M.-S.","year":"2005","journal-title":"Org. Lett."},{"key":"ref11\/cit11","doi-asserted-by":"crossref","first-page":"6551","DOI":"10.1002\/anie.200602275","volume":"45","author":"Poulsen T. B.","year":"2006","journal-title":"Angew. Chem., Int. Ed."},{"key":"ref12\/cit12","unstructured":"In every case, a single diastereoisomer was observed by1H NMR analysis of the crude mixture."},{"key":"ref13\/cit13","unstructured":"1kand1lwere prepared in low (<20%) yield according to ref6c. Use of this method (PhSO2Na, HCOOH, H2O\/MeOH or THF) or other procedures effective for \u03b1-amido sulfones (CH2Cl2, PhSO2H; PhSO2Na, HCOOH, MeOH\/H2O, 70 \u00b0C), other aromatic aldehydes (2-bromobenzaldehyde, anisaldehyde), or a tertiary aliphatic aldehyde (pivalaldehyde) failed to give the expectedN-hydroxy-\u03b1-amido sulfones."},{"key":"ref14\/cit14","unstructured":"This result seems to suggest that the two ester groups are not as independent as assumed in the simplified two-step pathway depicted in Scheme1, although1H NMR analysis of the crude products4b\u2212erevealed the presence of small amounts (<7 mol %) of the linear non-cyclized products (adductCin Scheme1)."},{"key":"ref15\/cit15","doi-asserted-by":"crossref","first-page":"6394","DOI":"10.1021\/ja071509y","volume":"129","author":"Mizuta S.","year":"2007","journal-title":"J. Am. Chem. 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