8,9-dihydro-10-methyl-7-[(5-methyl-1-trityl-1H-imidazol-4-yl)methylene]pyrido[1,2-a]indol-6(7H)-one → 8,9-dihydro-10-methyl-7-[(5-methyl-1-trityl-1H-imidazol-4-yl)methyl]-pyrido[1,2-a]indol-6(7H)-one

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A mixture of 8,9-dihydro-10-methyl-7-[(5-methyl-1-trityl-1H-imidazol-4-yl)methylene]pyrido[1,2-a]indol-6(7H)-one (2.0 g) and 10% palladium on carbon (0.4 g) in N,N-dimethylformamide-ethanol (6:1, 49 ml) was hydrogenated at an atmospheric pressure for 6 hours. After filtration of the catalyst, the filtrate was evaporated in vacuo to give 8,9-dihydro-10-methyl-7-[(5-methyl-1-trityl-1H-imidazol-4-yl)methyl]-pyrido[1,2-a]indol-6(7H)-one as an oil, which was used in the next reaction without purification.

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