ASYMMETRIC GRIGNARD SYNTHESIS WITH CYCLIC 1,2 AMINOALCOHOLS

摘要

Processes for preparing a single enantiomer of an alpha , alpha -disubstituted- alpha -hydroxy acetic acid, especially cyclohexylphenylglycolic acid (CHPGA), is disclosed. The processes employ cyclic 1,2-aminoalcohols as chiral auxiliaries by forming diastereomeric esters of aminoalcohols or diastereomeric amides of oxazolidines. Intermediates of formulae (A) and (B) useful in the process are also disclosed.