反应详情

To a solution of 20 g of 5-formyl-3-ethylthioimidazo[1,5-a]pyridine in 200 ml of isopropanol is added approximately 15 g of Raney nickel. The reaction mixture is stirred and heated at reflux temperature for 16 hours. The catalyst is removed by filtration through celite. The filtrate is evaporated under reduced pressure to yield an oily residue. This is purified by column chromatography on silica gel using a mixture of diethyl ether and ethyl acetate (2:1) as eluent. Evaporation of the solvent under reduced pressure yields 5-formylimidazo[1,5-a]pyridine melting at 138°-140°.

1. temperatureheated
2. temperatureat reflux temperature for 16 hours
3. customThe catalyst is removed by filtration through celite
4. customThe filtrate is evaporated under reduced pressure
5. customto yield an oily residue
6. customThis is purified by column chromatography on silica gel using
7. additiona mixture of diethyl ether and ethyl acetate (2:1) as eluent
8. customEvaporation of the solvent under reduced pressure