4(3)substituted-4(3)-aminomethyl-(thio)pyran or piperidine derivatives (=gabapentin analogues), their preparation and their use in the treatment of neurological disorders

The compound of the invention are those of formula

• or a pharmaceutically acceptable salt thereof wherein:
• n is an integer of from 0 to 2;
• R is a heterocycle selected from
• and
• X is —O—, —S—, —S(O)—, —S(O)2—, or NR′1 is hydrogen, straight or branched alkyl of from 1 to 6 carbons, benzyl, —C(O)R′2 is straight or branched alkyl of 1 to 6 carbons, benzyl or phenyl or —CO2R′3 wherein R′3 is straight or branched alkyl of from 1 to 6 carbons, or benzyl wherein the benzly or phenyl groups can be unsubstituted or substituted by from 1 to 3 substituents selected from halogen trifluoromethyl, and nitro.