ClC[CH2:3][CH2:4][CH2:5][CH2:6][C:7]1[N:12]2[CH:13]=[N:14][CH:15]=[C:11]2[CH:10]=[CH:9][CH:8]=1.BrCCCC[Cl:21]>>[Cl:21][CH2:3][CH2:4][CH2:5][CH2:6][C:7]1[N:12]2[CH:13]=[N:14][CH:15]=[C:11]2[CH:10]=[CH:9][CH:8]=15-(4-Chlorobutyl)-imidazo[1,5-a]pyridine is prepared by the procedure described for the preparation of 5-(5-chloropentyl)imidazo[1,5-a]pyridine of Example 4 using 1-bromo-3-chloropropane as reagent instead of 1-bromo-4-chlorobutane therein.
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