Process for preparing [2-(2,3-dihydrobenzofuran- or benzofuran-7-yloxy)ethyl]-(3-cyclopent-1-ylbenzyl)amine derivatives and synthesis intermediate

The invention relates to a process for the preparation of compounds of general formula (3) wherein: (a) represents a single or double bond; W represents a group CH, CH2, CHCH3, CCH3, C(CH3)2, a group C(CH2)2 (i.e. a carbon atom carrying two methylene groups bonded to one another so as to form a spiro-cyclopropane moiety), with the proviso, however, that when (a) is a double bond then W represents exclusively a group CH or CCH3 and when (a) is a single bond then W represents exclusively a group CH2, CHCH3, C(CH3)2 or C(CH2)2.