Ethanol → Ethyl 7-((2,2-dimethyl-1,3-dioxolan-4-yl)methoxy)imidazo[1,2-a]pyridine-3-carboxylate

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Reaction Conditions

Reaction Steps

4-((2,2-Dimethyl-1,3-dioxolan-4-yl)methoxy)pyridin-2-amine (5.6 g, 0.025 mol) was mixed with ethanol (60 mL) in a reaction flask, under an atmosphere of dry nitrogen. A solution of ethyl 2-chloro-3-oxopropanoate (5% in benzene; 93 mL; Commercial solution from Toronto Research Chemicals Inc.) was added. The mixture was heated to 60° C. under nitrogen for 2 hours. After allowing the mixture to cool the solvent was removed under vacuum to give a brown solid. The solid was mixed with ethyl acetate (200 mL) and sodium bicarbonate solution (100 mL) and stirred to dissolve. The phases were separated and the bicarbonate solution was extracted further with ethyl acetate (50 mL). The combined ethyl acetate extracts were dried over sodium sulfate, filtered and concentrated under vacuum to give a solid. The crude material was dissolved in ethyl acetate and passed through a short column of silica, eluting with ethyl acetate. Fractions containing the product were concentrated to give ethyl 7-((2,2-dimethyl-1,3-dioxolan-4-yl)methoxy)imidazo[1,2-a]pyridine-3-carboxylate as a pale yellow solid (5.76 g).

Provenance & Evidence