Patent ID: 8563784

Claim:
A method of preparing a compound of formula (IV) by a reaction of catalytic hydrogenation of a compound of formula (III), said compound of formula (III) being obtained by a reaction of base catalysed aldolization, wherein said hydrogenation reaction is catalyzed by a Raney catalyst that was pretreated with at least one buffer compound enabling said hydrogenation reaction to be maintained at a pH between 6 and 8; the compounds of formula (III) and (IV) are as follows: in which: R 1 is a radical with from 1 to 10 carbon atoms, R 2 is a hydrogen atom or a radical with from 1 to 10 carbon atoms, R 3 is a hydrogen atom or a radical with from 1 to 10 carbon atoms, and X is a hydrogen atom, an alkyl group, an aryl group, an alkoxy group, or a vinyl group.