1-Ethyl-3-(3'-dimethylaminopropyl)carbodiimide → HCID 178433765, compound

Participants

Reaction Steps

A mixture of 2-({2-methyl-3-[4-phenyl-5-(1H-1,2,4-triazol-3-yl)-1,3-thiazol-2-yl]pyrazolo[1,5-a]pyridin-5-yl}oxy)ethanamine di-hydrochloride (100 mg, 0.20 mmol) obtained in Example 73-B(i), TEA (1.5 mL), 2-[(tert-butoxycarbonyl)amino]-2-methylpropanoic acid (75 mg, 0.37 mmol), HOBT (50 mg, 0.37 mmol), EDCI (210 mg, 1.1 mmol) and DMF (20 mL) was stirred at rt for 14 h. To the reaction mixture were added water (200 mL) and EtOAc (200 mL) and the mixture was stirred for 30 min. The organic layer was washed with water and brine, and dried over anhydrous magnesium sulfate. Insoluble materials were removed by filtration, and the filtrate was concentrated under reduced pressure. To a solution of the above residue in MeOH (10 mL) and THF (15 mL) was added 6N hydrochloric acid (3 mL), and the mixture was stirred at 70° C. for 1 h. The reaction mixture was allowed to cool to rt and then the solvent was evaporated. To the reaction mixture were added EtOAc (100 mL), 8N aqueous sodium hydroxide solution (3 mL) and water (100 mL), and the mixture was stirred for 30 min. The organic layer was washed with brine and dried over anhydrous magnesium sulfate. Insoluble materials were removed by filtration, and the filtrate was concentrated under reduced pressure. The residue was washed with diisopropyl ether and dried to give the title compound (46 mg, 45%) as a white solid.

Provenance & Evidence