1-Aminocyclopropane-1-carboxylic acid → 1-({[4-Cyano-3-(trifluoromethyl)phenyl]carbamoyl}amino)cyclopropanecarboxylic acid

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Reaction Steps

A solution of 4-isocyanato-2-(trifluoromethyl)benzonitrile (4.56 g, 21.5 mmol) in acetone (12 ml) is added dropwise to 1-aminocyclopropane carboxylic acid (2.02 g, 20 mmol) dissolved in an aqueous solution of sodium hydroxide (12 ml, 0.8 g, 20 mmol). The reaction medium is stirred for 1 hour at ambient temperature then poured into an aqueous solution of sodium hydroxide (1N, 40 ml). The solution obtained is washed with ethyl acetate (30 ml) then acidified by the addition of an aqueous solution of sulphuric acid (2M, 30 ml) and extracted with ethyl acetate (2×50 ml). The organic phase thus obtained is washed with water then with a saturated aqueous solution of sodium chloride, dried over Na2SO4 and filtered. The solvent is evaporated off under reduced pressure. The residue obtained is taken up in ethyl ether in order to produce a white solid, after filtration, with a yield of 50% (3.16 g).

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