| abstract |
The invention concerns a method for preparing compounds of formula (I) in which R1 to R5, n, Y are as defined in claim 1, comprising a step consisting in reacting a phenolic derivative of formula (II) in which R1 to R4 are as defined in (I), with a compound of formula (III) in which n, Y and R5 are as defined in (I) and E represents a -CHO function optionally protected, as indicated in claim 1, in the presence of a mineral or organic acid. |