The present invention relates to new 1-heteroarylazetidines and new 1-heteroarylpyrrolidines endowed with 5-HT.sub.3 agonist activity of formula (I): ##STR1## in which A is --CH=CH--; R is hydrogen, halogen, C.sub.1-4 alkyl, C.sub.1-4 alkoxy, C.sub.1-4 alkylthio, cyano, carboxamido, trifluoromethyl, a vinyl group, a formyl group, a carboxyl group in free, salt or esterified form, hydroxyl, hydroxymethyl, mercapto, amino, mono- or di-(C.sub.1-4 alkyl)amino, aminomethyl, mono- or di(C.sub.1-4 alkyl)aminomethyl, 1-piperido, 1-pyrrolidino, 1-piperazino or 4-(C.sub.1-4 alkyl)-1-piperazino, where R may replace any one of the hydrogen atoms of the heteroaryl nucleus; R.sub.1 is hydrogen or a methyl group; R.sub.2 and R.sub.3, which are identical or different, are hydrogen or C.sub.1-4 alkyl; n is 1 or 2; m is 0 or 1; and m+n.gtoreq.2; and addition salts with inorganic or organic acids of the compounds of formula (I). The invention also relates to pharmaceutical compositions containing these compounds, as well as to methods of treatment or prophylaxis of disorders which involve the peripheral or central serotoninergic systems.
The present invention provides compounds of formula (I) and the pharmaceutically acceptable salts thereof, wherein R is C.sub.3 -C.sub.7 cycloalkyl, aryl or C.sub.1 -C.sub.6 alkyl, said C.sub.1 -C.sub.6 alkyl, said C.sub.1 -C.sub.6 alkyl being optionally substituted by fluoro, COOH, --COO(C.sub.1 -C.sub.4 alkyl), C.sub.3 -C.sub.7 cycloalkyl, adamantyl, aryl or het.sup.1, and said C.sub.3 -C.sub.7 cycloalkyl being optionally substituted by 1 or 2 substituents each independently selected from C.sub.1 -C.sub.4 alkyl, C.sub.3 -C.sub.7 cycloalkyl, C.sub.1 -C.sub.4 alkoxy, hydroxy, fluoro, fluoro (C.sub.1 -C.sub.4) alkyl and fluoro (C.sub.1 -C.sub.4) Alkoxy; R.sub.1 is phenyl, naphthyl, thienyl, benzothienyl or indolyl, each optionally substituted by 1 or 2 substituents each independently selected from C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 alkoxy, halo and trifluormethyl; R.sup.2 is --CO.sub.2 H, --CONR.sup.3 R.sup.4, --CONR.sup.5 (C.sub.3 -C.sub.7 cycloalkyl), --NR.sup.5 (C.sub.2 -C.sub.5 alkanoyl), --NR.sup.3 R.sup.4, --NR.sup.5 CONR.sup.5 R.sup.6, (C.sub.3 -C.sub.7 cycloalkyl-C.sub.1 -C.sub.4 alkyl)R.sup.5 N--, --NR.sup.5 COCF.sub.3, --NR.sup.5 SO.sub.2 CF.sub.3, --NR.sup.5 (SO.sub.2 C.sub.1 -C.sub.4 alkyl), --NR.sup.5 SO.sub.2 NR.sup.5 R.sup.6, --NR.sup.5 (SO.sub.2 aryl), --N(aryl) (SO.sub.2 C.sub.1 -C.sub.4 alkyl), --OR.sup.5, --O(C.sub.3 -C.sub.7 cycloalkyl), --SO.sub.2 NR.sup.5 R.sup.6, het.sup.3 or a group of formulas: (a), (b), (c), (d), (e), (f), (g) or (h); X is C.sub.1 -C.sub.4 alkylene; X.sup.1 is a direct link or C.sub.1 -C.sub.6 alkylene; X.sup.2 is a direct link, CO, SO.sub.2, or NR.sup.5 CO; and m is 0, 1 or 2; together with intermediates used in the preparation of compositions containing and the use as tachykinin angatonists of such derivatives. ##STR1##
