| abstract |
PRECISION OF DISCLOSURE: Process for the preparation of the compounds (I): (I) where Z represents -C02 R1, R1 being an alkyl (C1-C6), C02H or CN, characterized mainly in that one reacts a compound (II): (II) where R is an alkyl (C1-C6) or - (CH2) 2- or - (CH2) 3- with a sulfone (III): (III) where Y is an aromatic residue, performs an aqueous treatment, then a treatment with a strong base, hydrolyzes the function ketal then, if desired, treats with a weak base to obtain a derivative I of trans configuration. |