Hydrochloric Acid → Benzyl 4,6-dihydro-4-oxo-3-phenylpyrido[2,1-a]isoindole-1-carboxylate

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A solution of 1.62 9 of tetraethyl orthotitanate in 71 ml of benzyl alcohol was treated with 4.52 g of methyl 4,6-dihydro-4-oxo-3-phenylpyrido[2,1-a]isoindole-1-carboxylate and stirred at 115°-120° under argon for 3 hours. The reaction mixture was then cooled, stirred with 71 ml of 1N hydrochloric acid for 1 hour, diluted with 350 ml of water and extracted several times with methylene chloride. The organic phases were washed with saturated sodium hydrogen carbonate solution, dried over sodium sulphate, filtered and evaporated. The residue was stirred in 710ml of diethyl ether for 1 hour, suction filtered and the material obtained was dried in a vacuum. There was obtained 4.02g of benzyl 4,6-dihydro-4-oxo-3-phenylpyrido[2,1-a]isoindole-1-carboxylate as yellowish crystals with a m.p. of 229°.

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