Ammonia → HCID 136336857, compound

Participants

Reaction Conditions

Reaction Steps

Under a nitrogen atmosphere, to a solution of 148 mg of 5-chloroindoline in 1 mL of toluene was added 0.54 mL of a 1.8 M trimethylaluminum solution in toluene at 0° C., followed by stirring at room temperature for 2 hours (solution A). Under a nitrogen atmosphere, to a mixture of 100 mg of methyl 1-cyclopentyl-4-oxo-4,5-dihydro-1H-pyrazolo[4,3-c]quinoline-7-carboxylate and 3 mL of toluene was added the solution A, followed by stirring at 70° C. for 8 hours. After cooling to room temperature, to the reaction mixture was added diluted hydrochloric acid, and the mixture was poured into a mixture of water and ethyl acetate. The pH was adjusted to 10 with 28% aqueous ammonia. The insoluble material was separated by filtration. The aqueous layer was separated, the organic layer was washed with saturated brine and then dried over anhydrous magnesium sulfate, and the solvent was evaporated under reduced pressure. The obtained residue was purified by silica gel column chromatography (chloroform/methanol=100/0-92/8) to obtain 65 mg of 7-[(5-chloro-2,3-dihydro-1H-indol-1-yl)carbonyl]-1-cyclopentyl-1,5-dihydro-4H-pyrazolo[4,3-c]quinolin-4-one as white powder.

Provenance & Evidence