Benzimidazolinyl piperidines as CGRP ligands

A compound of formula I

• wherein:
• R1 is naphthyl or benzothienyl which is unsubstituted or substituted at up to three substitutable positions independently by C1-6 alkyl, halogen, C1-6 alkoxy, CF3, OCF3, NO2, CN, methylenedioxy or ethylenedioxy;
• R2 is hydrogen, C1-8 alkyl, —(CH2)t-aryl wherein aryl is selected from phenyl, biphenyl and naphthyl, —(CH2)t-heteroaryl wherin heteroaryl is selected from tetrazolyl, oxadiazolyl, thiadiazolyl, triazolyl and pyrazinyl, —(CH2)qC(O)OR6, —(CH2)qOR6, —(CH2)qOC(O)R6, —(CH2)qC(O)R6, —(CH2)qC(O)(CH2)taryl, —(CH2)qN(R6)C(O)R6, —(CH2)qC(O)N(R6)2, —(CH2)qN(R6)SO2R6, —(CH2)qN(R6)C(O)N(R6)2, —(CH2)qOC(O)N(R6)2, —(CH2)qN(R6)C(O)OR6, —(CH2)qN(R6)SO2N(R6)2 and —(CH2)qS(O)mR6;
• R3 is NH2;
• R4 is hydrogen, C1-6 alkyl, C1-6 alkoxy, halogen, OCF3 or CF3;
• R5 is hydrogen, C1-6 alkyl, C1-6 alkoxy, halogen, OCF3 or CF3;
• R6 is hydrogen, C1-8 alkyl or C3-7 cycloalkyl, and when two R6 groups are present and both represent C1-8 alkyl they may optionally together with the atom to which they are both attached form a C3-8 ring;
• Q is —(CH2)x—C(R7)(R7a)—(CH2)y— or —(CH2)x—V—(CH2)y—;
• R7 and R7a are independently chosen from hydrogen, CF3, halogen, C1-6 alkyl and C1-6 alkoxy;
• V is a C3-8 non-aromatic cyclic or bicyclic ring or an aromatic ring which is benzene or naphthalene, said ring being unsubstituted or substituted at up to three substitutable positions independently by C1-6 alkyl, C1-6 alkoxy, halogen, OCF3, CF3, CN, NO2, methylenedioxy or ethylenedioxy;
• m is 0, 1 or 2;
• q is 0, 1, 2, 3 or 4;
• t is 0, 1, 2 or 3;
• x and y are independently 0, 1, 2, 3 or 4;
• or a pharmaceutically acceptable salt thereof.