反应详情

A mixture of 1-(8-(5,6-dimethoxypyridin-2-ylamino)imidazo[1,2-b]pyridazin-6-yl)pyrrolidine-3-carboxylic acid (80 mg, 0.21 mmol), tert-butyl 4-aminobenzoate (40 mg, 0.21 mmol), EDCI (159 mg, 0.08 mmol) and 1-methyl-1H-imidazole (68 mg, 0.8 mmol) in dichloromethane (5 mL) was stirred at room temperature for 16 h. The residue was concentrated to give crude tert-butyl 4-(1-(8-(5,6-dimethoxypyridin-2-ylamino)imidazo[1,2-b]pyridazin-6-yl)pyrrolidine-3-carboxamido)benzoate (200 mg, crude) as brown liquid that was used directly without purification. LC-MS: 560 [M+1]+, tR=1.510 min.

1. concentrationThe residue was concentrated