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A mixture of 67.2 mL of acetic anhydride and 28.8 mL of formic acid was heated at 50-60° C. oil bath temperature for 3 h and then cooled to rt to give formic-acetic anhydride, which was then slowly added into the solid ethyl 2-(aminomethyl)-3-pyridinecarboxylate HCl and then stirred at rt for 8 h. Excess reagent was evaporated to give a residue, which was neutralized by very slow addition of sat NaHCO3 solution. Solution was extracted with DCM, dried and evaporated to provide imidazo[1,5-a]pyridine as a yellow solid. MS: exact mass calculated for C10H10N2O2, 190.07; m/z found, 191 [M+H]+.

1. customExcess reagent was evaporated
2. customto give a residue, which
3. extractionSolution was extracted with DCM
4. customdried
5. customevaporated