Reversal of diastereofacial selectivity in the nucleophilic addition reaction to chiral N-sulfinimine and application to the synthesis of indrizidine 223AB
Diastereoselective addition reaction of ester enolates and Grignard reagents to optically active N-sulfinimines was examined. Reversal of the diastereofacialselectivity was realized by using appropriate metal species, solvents and additives, and the β-amino esters (up to >98% de) and the homoallylic amines (up to >98% de) were obtained in good yields. β-Amino esters thus obtained were converted to