Ammonium formate → HCID 10039871, compound

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A solution of 8,9-dihydro-10-methyl-7-[(pyridin-3-yl)-methylene]pyrido[1,2-a]indol-6(7H)-one (520 mg), ammonium formate (568 mg) and 10% palladium on carbon (200 mg) in acetic acid (20 ml) was stirred at 110° C. for 2 hours. After filtration of the catalyst, the filtrate was evaporated in vacuo. The residue was diluted with 10% methanol-chloroform. The solution was washed with 5% aqueous solution of sodium hydrogencarbonate and brine, dried over anhydrous magnesium sulfate, and evaporated in vacuo. Purification of the residue with silica gel chromatography (5% methanol-chloroform), followed by recrystallization from ethyl acetate-ether, gave 8,9-dihydro-10-methyl-7-[(pyridin-3-yl)methyl]pyrido[1,2-a]indol-6(7H)-one (273 mg).

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