Ethylene Glycol → HCID 15617188, compound

Participants

Reaction Conditions

Reaction Steps

A mixture of N-[3-[(3-fluorobenzoyl)amino]-2-pyridinyl]glycine ethyl ester (20.44 g, 0.065 mole), and ethylene glycol (75 ml) was heated at 195° C. for 40 minutes. Water was added to the cooled reaction mixture and the solid was collected by filtration. The solid was suspended in water (2×100 ml) and collected by filtration to give 17.75 g of crude 2-(3-fluorophenyl)-3H-imidazo[4,5-b]pyridine-3-acetic acid ethyl ester. A portion of this solid (6.0 g, 0.02 mole) together with sodium hydroxide pellets (0.9 g, 0.0231 mole), and 50 ml of ethanol-water (1:1) was refluxed for 1 hour. The ethanol was evaporated. The residual aqueous mixture was cooled, diluted with water (50 ml) and extracted with diethyl ether (2×25 ml). The aqueous portion was acidified to a pH of 3 with concentrated hydrochloric acid. After precipitation was complete, the solid was collected by filtration. The filter cake was suspended in ethanol and filtered, giving 4.94 g (91%). Recrystallization of a 1.2-g sample from tetrahydrofuran gave 1.1 g of an off-white solid, mp 243°-245° C. with decomposition.

Provenance & Evidence