Triethylamine → (R)-1-[2-(2, 3-methylenedioxyphenyl) heptyl]-3-(4-ethoxycarbonyl-1-phenylpyrazole-5-yl) urea

Participants

Reaction Steps

To a mixture of 1.16 g of 5-amino-1-phenylpyrazole-4-carboxylic acid ethyl ester and 10 ml of methylene chloride were dropwise added 0.53 g of bis (trichloromethyl) carbonate and 1.11 g of triethylamine in order with ice cooling and stirring, and the resultant mixture was refluxed with heating for 4 hours. The reaction mixture was allowed to cool to room temperature, mixed with a solution of 1.18 g of (r)-2-(2, 3-methylenedioxyphenyl) heptylamine in 3 ml of methylene chloride, stirred at room temperature for 2 hours and the solvent evaporated. Water was added to the residue, and the mixture was extracted with ethyl acetate. The organic layer was washed with saturated saline, dried over anhydrous sodium sulfate and the solvent evaporated. The residue was chromatographed on a column of silica gel, eluting with ethyl acetate and n-hexane (2:5) to give 1.94 g of the titled compound as amorphous solid.

Provenance & Evidence