1-Hydroxybenzotriazole → HCID 178500824, compound

Participants

Reaction Conditions

Reaction Steps

Trans-4-{[N-(tert-butoxycarbonyl)-N-(4-tert-butylcyclohexyl)amino]methyl}benzoic acid (22.0 g, 56.5 mmol) and 1-hydroxybenzotriazole (8.6 g, 57.0 mmol, containing 12% w/w water) was dissolved in DMF (300 mL). N-Dimethylaminopropyl-N′-ethylcarbodiimide hydrochloride (10.9 g, 56.8 mmol), β-alanine methyl ester (8.4 g, 60 mmol) and diisopropylethylamine (25 mL, 142 mmol) were added and the clear solution stirred at 20° C. for 16 hours. Solvent was removed by rotary evaporation and the residual oil re-dissolved in ethyl acetate (500 mL). The organic phase was washed with 5% aqueous sodium hydrogen carbonate solution (2×500 mL), 0.5 M citric acid (2×250 mL) and brine before being dried with anhydrous Na2SO4. Solvent was removed and the residual oil evaporated twice from acetonitrile. The oil was used without further purification. Yield: 24.0 g (89%).

Provenance & Evidence