PROCESS

摘要

A process for preparing the S or R enantiomer of a compound of formula A, (B), (A) the process comprising subjecting a compound of formula B to asymmetric hydrogenation in the presence of a chiral transition metal catalyst and a source of hydrogen, wherein: X is CH2, oxygen or sulphur; R1, R2 and R3 are the same or different and signify hydrogens, halogens, alkyl, alkyloxy, hydroxy, nitro, alkylcarbonylamino, alkylamino or dialkylamino group; and R4 is alkyl or aryl, wherein the transition metal catalyst comprises a chiral ligand having the formula (I) wherein p is from 1 to 6, and Ar means aryl group; wherein: the term alkyl means hydrocarbon chains, straight or branched, containing from one to six carbon atoms, optionally substituted by aryl, alkoxy, halogen, alkoxycarbonyl or hydroxycarbonyl groups; the term aryl means an aromatic or heteroaromatic group, optionally substituted by alkyloxy, halogen or nitro group; and the term halogen means fluorine, chlorine, bromine or iodine.