Patent ID: 9701607
Date: 2017-07-11
CPC Classifications: C07C,C11B

Claim:
1. A method of preparation of a compound of formula (I) in which: R R R Z represents C(O) or CR R R knowing that a double bond is present or absent in the ring and that when it is present, it is either in position 2-3 and R or in position 3-4 and R i) reaction of an α-methylene aldehyde, in the presence of an inorganic base, with a symmetrical ketone to obtain a compound of formula (Ia), in which R ii) mono- or bis-alkylation reaction in order to obtain a compound of formula (Ia) in which R iii) conversion of the Z═C(O) function of the compound obtained in the preceding step into a Z═CR iv) reduction of the double bond at 2-3 or 3-4 present in the ring of the compound obtained in the preceding step, step iv) being able to be performed after any one of steps i), ii), or iii).