1-tert-Butyl-3-methyl-1H-pyrazole-5-carbonyl chloride → 2-tert-Butyl-5-methyl-2H-pyrazole-3-carboxylic acid [3-(2-oxo-2,3-dihydro-1H-indole-6-carbonyl)-phenyl]-amide

Participants

Reaction Steps

A dry 250 mL flask was charged with 2-tert-Butyl-5-methyl-2H-pyrazole-3-carbonyl chloride (1.00 g, 4.98 mmol) and THF (40 mL). 6-(3-Amino-benzoyl)-1,3-dihydro-indol-2-one (as prepared in Example 40, 1.0 g, 3.96 mmol) was added to the THF solution of the acid chloride, and the mixture was allowed to reflux for 3 h. The reaction mixture was then allowed to cool to room temperature. The room temperature reaction mixture was concentrated in vacuo. The solid residue was suspended in boiling EtOAc. The suspension was allowed to cool to room temperature before filtering to afford the 2-tert-Butyl-5-methyl-2H-pyrazole-3-carboxylic acid [3-(2-oxo-2,3-dihydro-1H-indole-6-carbonyl)-phenyl]-amide as a tan solid (0.984 g, 2.363 mmol, 60%).

Provenance & Evidence