反应详情

253 ml of 2N aqueous sodium hydroxide solution were added to a solution of 15.7 g (50.59 mmol) of ethyl 8-(benzyloxy)-2-methylimidazo[1,2-a]pyridine-3-carboxylate in 253 ml of dioxane, and the mixture was stirred at room temperature for 14 hours. 101 ml of 6N hydrochloric acid were then added to the mixture. The solid formed was filtered off, washed with water and with methyl tert-butyl ether and then dried in a vacuum drying cabinet at 40° C. overnight. This gave 15.49 g (108% of theory) of 8-(benzyloxy)-2-methylimidazo[1,2-a]pyridine-3-carboxylic acid as a colourless solid. The yield was more than 100% owing to water of crystallization (1H NMR).

1. customThe solid formed
2. filtrationwas filtered off
3. washwashed with water and with methyl tert-butyl ether
4. customdried in a vacuum
5. customdrying cabinet at 40° C. overnight
6. customThe yield was more than 100% owing to water of crystallization (1H NMR)