Patent ID: 8173846

Claim:
A process for the preparation of a compound of formula wherein: the asterisk indicates that the compound (I) is in an optically active form; the R 1 , taken separately, are identical and represent an achiral C 1-7 linear, branched or cyclic alkyl, alkenyl or alkynyl group optionally substituted, or alternatively two R 1 , taken together, represent a linear C 2 -C 12 alkanediyl, alkenediyl or alkyndiyl group optionally substituted; R 2 represents an achiral C 1-7 linear, branched or cyclic alkyl or alkenyl group optionally substituted or a phenyl or benzyl group optionally substituted; by treating a ketone of one of formulae: wherein compound (II) can be in the form of any one of its stereoisomers, diasteroisomers or of a mixture thereof, with a reacting system comprising: at least one salt of an optically active primary amino acid, or at least one optically active primary amino acid, or a mixture thereof under conditions sufficient to form the compound of formula (I).