Benzofuran ethylamine compounds

A compound selected from those of the formula (I):

• ##STR29## in which:
• Ar' represents:
• benzo[b]furan-3-yl of formula (V):
• ##STR30## R.sub.1 represents:
• a group ##STR31## in which R.sub.7 represents unsubstituted or optionally substituted cycloalkyl, unsubstituted or optionally substituted cycloalkyl-(C.sub.1 -C.sub.4)alkyl, or trifluoromethyl,
• a group ##STR32## in which R.sub.8 represents linear or branched lower alkyl having 1 to 6 carbon atoms, inclusive, unsubstituted of optionally substituted cycloalkyl, unsubstituted or optionally substituted cycloalkyl-(C.sub.1 -C.sub.4) alkyl unsubstituted or optionally substituted aryl, or unsubstituted or optionally substituted arylalkyl in which the alkyl chain contains 1 to 3 carbon atoms, inclusive, or
• a group ##STR33## in which
• n represents 1 to 3 inclusive and E.sub.1 represents a radical selected from:
• morpholino and
• piperazine which radical is unsubstituted or substituted by a radical --(CH.sub.2).sub.n' -E.sub.2 wherein n' represents an integer 1 to 4 inclusive and E.sub.2 represents phenyl or naphthyl, each of which is unsubstituted or substituted by 1 to 3 radicals selected from:
• halogen, (C.sub.1 -C.sub.4)alkyl, and (C.sub.1 -C.sub.4)alkoxy;
• R.sub.2 represents hydrogen or linear or branched lower alkyl having 1 to 6 carbon atoms inclusive;
• R.sub.3 represents hydrogen, linear or branched lower alkyl having 1 to 6 carbon atoms, inclusive unsubstituted or optionally substituted aryl, unsubstituted or optionally substituted arylalkyl or diarylalkyl in which the alkyl chain contains 1 to 3 carbon atoms, inclusive, or cycloalkyl or cycloalkylalkyl in which the alkyl chain contains 1 to 3 carbon atoms, inclusive,
• R.sub.3 ' represents hydrogen or a group --O--R.sub.3 wherein R.sub.3 is as defined above;
• R.sub.4 represents hydrogen, halogen, hydroxy, linear or branched alkoxy having 1 to 6 carbon atoms, inclusive, or linear or branched lower alkyl having 1 to 6 carbon atoms, inclusive,
• R.sub.5 represents hydrogen, halogen, linear or branched lower alkyl having 1 to 6 carbon atoms, inclusive, unsubstituted or optionally substituted phenyl, or unsubstituted or optionally substituted phenylaklyl in which the alkyl chain contains 1 to 3 carbon atoms, inclusive, and
• R.sub.6 represents hydrogen, or linear or branched lower alkyl having from 1 to 6 carbon atoms, inclusive;
• an optical isomer,
• and an addition salt thereof with a pharmaceutically-acceptable acid or base,
• with the proviso that:
• Ar' may not represent 7-methoxybenzo[b]furan-3-yl when R.sub.1 represents cyclopropylcarbonyl;
• and wherein
• the term "substituted" associated with the expressions "aryl", "arylalkyl", "diarylalkyl", "phenyl" and "phenylalkyl" means that the aromatic nucleus or nuclei may be substituted by one or more radicals selected from:
• linear or branched lower alkyl having 1 to 6 carbon atoms, inclusive, linear or branched lower alkoxy having from 1 to 6 carbon atoms, inclusive, hydroxy, halogen, nitro, and trifluoromethyl;
• the term "substituted" associated with the expressions "cycloalkyl" and "cycloalkyl-(C.sub.1 -C.sub.4 )alkyl" means that the cyclic system may be substituted by one or more radicals selected from:
• halogen, linear or branched lower alkyl having 1 to 6 carbon atoms, inclusive, and linear or branched lower alkoxy having 1 to 6 carbon atoms, inclusive;
• the term "cycloalkyl" designates a saturated or unsaturated cyclic system having 3 to 8 carbon atoms, inclusive, and
• the expression "aryl group" means pyridyl, phenyl, naphthyl, thienyl, furyl, or pyrimidyl.