Triethylamine → 4-({1-[4-(5-Cyclopropylmethoxy-1,3-benzodioxol-4-yl)-5H-pyrrolo[3,2-d]pyrimidin-7-yl]-methanoyl}-amino)-piperidine-1-carboxylic acid tert-butyl ester

Participants

Reaction Steps

To a suspension of 4-(5-cyclopropylmethoxy-1,3-benzodioxol-4-yl)-5H-pyrrolo[3,2-d]pyrimidine-7-carboxylic acid (3.53 g; 10.0 mmol) from example A67 in dry dichloromethane (50 mL) is added 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (12.0 mmol), triethylamine (15.0 mmol) and 1-hydroxybenzotriazole (10.0 mmol). The suspension is stirred at ambient temperature for one hour. To the resulting solution, 4-amino-piperidine-1-carboxylic acid tert-butyl ester (12.0 mmol) is added and stirring is continued overnight at ambient temperature. The reaction mixture is loaded onto a silica gel column and purified by flash chromatography using acetic acid ethyl ester/2-propanol (98:2 v/v). The eluate containing the product fraction is collected and evaporated. The product is triturated with n-hexane and dried in high vacuo at 50° C. to yield 3.85 g of the title compound as white solid.

Provenance & Evidence