摘要 |
Piperazine, piperidine, and tetrahydropyridine derivatives of formula (I), in racemic or optically isomeric or enantiomeric forms, and their salts, are new. A-B = CH2-CH, CH=C, or CH2-N; n = 0 or 1-6; D = a bicyclic system of any of the formulae e.g. (1)-(5); R1, R2 = H, halo, 1-5C alkyl or alkoxy, or OH; E = one of the heterocycles e.g. (a)-(e); with the proviso that E is not (d) when D is (2), (3) or (4), all joined by the 1-position. |