反应详情

A mixture of 4-(1,4-dihydroindeno[1,2-c]pyrazol-3-yl)benzoic acid (0.8 g), methylamine in ethanol (0.27 ml of a 33% w/w solution), 4-pyrrolidinopyridine (0.47 g), diisopropylcarbodiimide (0.5 ml) and dichloromethane (30 ml) was stirred at ambient temperature for 20 hours. More methylamine in ethanol (0.3 ml of a 33% w/w solution), 4-pyrrolidinopyridine (0.5 g) and diisopropylcarbodiimide (1 ml) were added and the mixture was stirred for 3 hours at ambient temperature. The solvent was removed under reduced pressure at 50° C. The mixture was kept under vacuum for 2 hours and then dichloromethane (50 ml) was added. The mixture was stirred at ambient temperature for 20 hours and then allowed to stand for 72 hours. A solid was removed by filtration and purified by flash column chromatography on silica using toluene/acetic acid (10:1) and then ethyl acetate as the mobile phase to give N-methyl-4-(1,4-dihydroindeno[1,2-c]pyrazol-3-yl)benzamide, m.p. 182-188° C.

1. stirringthe mixture was stirred for 3 hours at ambient temperature
2. customThe solvent was removed under reduced pressure at 50° C
3. waitThe mixture was kept under vacuum for 2 hours
4. additiondichloromethane (50 ml) was added
5. stirringThe mixture was stirred at ambient temperature for 20 hours
6. waitto stand for 72 hours
7. customA solid was removed by filtration
8. custompurified by flash column chromatography on silica