Aminocyclopentane alkenoic acids and esters and pharmaceutical compositions

Compounds of the general formula (1) ##STR12## wherein X is cis or trans -CH.dbd.CH-;

• R.sup.1 is straight or branched C.sub.1-7 alkyl bearing as a terminal substituent -COOR.sup.3 where R.sup.3 is a hydrogen atom, C.sub.1-6 alkyl or C.sub.7-10 aralkyl;
• Y represents a saturated heterocyclic amino group which has 5 to 7 ring members and (a) optionally contains in the ring -O-, -S-, -SO.sub.2 -, -NR.sup.4 (where R.sup.4 is a hydrogen atom, C.sub.1-7 alkyl or aralkyl having a C.sub.1-4 alkyl portion;
• and (b) is optionally substituted by one or more C.sub.1-4 alkyl groups;
• R.sup.2 is (i) C.sub.2-4 alkanoyl;
• (ii) C.sub.3-6 alkenyl, optionally substituted by phenyl (the phenyl being optionally substituted by C.sub.1-4 alkyl, C.sub.1-4 alkoxy, halogen, C.sub.5-7 cycloalkyl or phenyl (C.sub.1-4) alkyl), biphenyl (optionally substituted by C.sub.1-4 alkyl, C.sub.1-4 alkoxy or halogen), or naphthyl;
• (iii) C.sub.1-12 alkyl;
• (iv) C.sub.1-5 alkyl substituted by (a) phenyl, (b) biphenyl (optionally substituted by phenyl or one or two C.sub.1-4 alkyl, C.sub.1-4 alkoxy, halogen substitutuents), or (c) naphthyl (optionally substituted by C.sub.1-4 alkyl, C.sub.1-4 alkoxy or halogen);
• and the physiologically acceptable salts and the solvents thereof.