3-(Trifluoromethyl)phenyl isocyanate → 1-(1-Benzyl-2-pyrrolidylidene)-3-(m-trifluoromethylphenyl)urea

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Reaction Steps

The fluoroborate salt of 1-benzyl-2-iminopyrrolidine (6.55 g.; 0.025 mole) is converted to free base (4.36 g; 0.025 mole) in the usual manner. After drying over K2CO3, the benzene solution is filtered through diatomaceous earth and 4.68 g. (0.025 mole) of m-trifluoromethylphenylisocyanate is added. The reaction mixture is stirred at room temperature for 1 hour and then evaporated to dryness in vacuo to give an oily residue of 1-(1-benzyl-2-pyrrolidylidene)-3-(m-trifluoromethylphenyl)urea which is dissolved in ether and converted to the hydrochloride salt. Recrystallizations from acetone-ether yields the pure product, 1-(1-benzyl-2-pyrrolidylidene)-3-(m-trifluoromethylphenyl)urea HCl, m.p. = 164°-165° C.

Provenance & Evidence