Diisopropylethylamine → HCID 117864551, compound

Participants

Reaction Steps

A solution of 280 mg (0.19 mmol, 23% purity) of 7-[(2,6-difluorobenzyl)oxy]-5-ethyl-2-methylpyrazolo[1,5-a]pyridine-3-carboxylic acid (Example 168A) in 4 ml of tetrahydrofuran was admixed with 43 mg (0.22 mmol) of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (CAS: 25952-53-8) and 30 mg (0.22 mmol) of 1-hydroxy-7-azabenzotriazole (CAS: 39968-33-7). The solution was stirred at room temperature for 20 minutes. The reaction mixture was admixed with 0.097 ml (0.56 mmol) of N,N-diisopropylethylamine and 48 mg (0.22 mmol) of rac-(1-amino-2-methylpentan-2-yl)carbamic acid tert-butyl ester (Example 152A). The mixture was stirred at room temperature for a further 24 hours, and the reaction mixture was then concentrated under reduced pressure. The residue was partitioned between dichloromethane and water. The organic phase was removed and concentrated under reduced pressure. The residue was purified by preparative HPLC chromatography (Method 21), which gave 19 mg (19% yield, 95% purity) of product.

Provenance & Evidence