Highly diastereoselective condensation of chiral sulfinyl-substituted furaldimine with lithium ester enolates has been achieved, affording (3R)-syn-beta-lactams and/or (3R)-syn-beta-amino esters, as the major products.
Diastereoselective Imino-Aldol Condensation of Chiral 3-(p-Tolylsulfinyl)-2-furaldimine and Ester Enolates.
and condensation of the chiral furaldimine with lithiumesterenolates has been examined. The product distribution of the reaction is dependent upon reaction conditions and on the kind of the substituent placed on the esters. Disubstituted esterenolate resulted in the exclusive formation of (4R)-beta-lactam, while unsubstituted, tert-butyl esterenolate preferentially gave (3R)-beta-amino ester. With