反应详情

2,3-Dimethyl-8-(2-ethyl-6-methylbenzylamino)-imidazo[1,2-a]pyridine-6-carboxylic acid (0.15 g, 0.44 mmol) and o-Benzotriazol-1-yl-N,N,N′,N′-Tetramethyluronium tetrafluoroborate (TBTU)(0.14 g, 0.44 mmol) were added to methylene chloride (10 ml). 4-ethoxyanilin(0.19 g, 1.4 mmol) was added and the reaction mixture was stirred at ambient temperature for 72 h. The solvent was evaporated under reduced pressure and the residue was added to a column with silica gel and was purified by chromatography using methylene chloride:methanol (95:5) as eluent. The residue was treated with a hot mixture of hexane:ethyl acetate (2:1) and the product was filtered off and dried to obtain 0.14 g (74%) of the desired compound as white crystals.

1. customThe solvent was evaporated under reduced pressure
2. additionthe residue was added to a column with silica gel
3. customwas purified by chromatography
4. additionThe residue was treated with a hot mixture of hexane:ethyl acetate (2:1)
5. filtrationthe product was filtered off
6. customdried