Dimethylformamide → HCID 178502388, compound

Participants

Reaction Steps

Oxalyl chloride (44.0 uL, 0.520 mmol) was added to a solution of 4-(5-carboxy-pyridin-2-yl)-piperazine-1-carboxylic acid tert-butyl ester (70.3 mg, 0.229 mmol) in dichloromethane (6.67 mL, 104 mmol) and N,N-dimethylformamide (2.01 uL, 0.026 mmol) The reaction mixture was stirred at room temperature for 20 min and then N,N-diisopropylethylamine (0.181 mL, 1.04 mmol) was added followed by ((S)-1-{(S)-2-[4-(4′-amino-biphenyl-4-yl)-1H-imidazol-2-yl]-pyrrolidine-1-carbonyl}-2-methyl-propyl)-carbamic acid methyl ester (100.0 mg, 0.217 mmol). The reaction mixture was stirred for 2 h at room temperature, then dried by rotary evaporation. The crude material was dissolved in dichloromethane (1 mL) and then washed with saturated aqueous sodium bicarbonate (1 mL). The organic layer was concentrated, dissolved in 4.0 M hydrogen chloride in 1,4-dioxane (6.7 mL, 27 mmol) and stirred for 1 h at room temperature until completely deprotected. The reaction mixture was concentrated and used directly in the next step.

Provenance & Evidence