Diisopropylethylamine → 1-((1S,3R)-3-benzyloxycarbonyl-1-biphenyl-4-ylmethyl-butylcarbamoyl)-1H-pyrazole-3-carboxylic acid

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Reaction Steps

Next, to a solution of 1H-pyrazole-3-carboxylic acid (20.5 mg, 0.183 mmol) in DMF (1 mL) is added diisopropylethylamine (0.032 mL, 0.183 mmol). After 15 min a solution of the above (2R,4S)-5-biphenyl-4-yl-4-isocyanato-2-methyl-pentanoic acid benzyl ester in DMF (1 mL) is added dropwise and the mixture is stirred at room temperature for 18 hours. The mixture is purified by preparative HPLC using a gradient of 10% MeCN to 100% MeCN (0.1% TFA). Lyophilization of the appropriate fractions furnishes 1-((1S,3R)-3-benzyloxycarbonyl-1-biphenyl-4-ylmethyl-butylcarbamoyl)-1H-pyrazole-3-carboxylic acid.

Provenance & Evidence