Cyclamate → 1-(1-n-Butyl-2-pyrrolidylidene)-3-(3-chloro-2-methylphenyl)urea

참여 물질

반응 단계

The cyclohexylsulfamic acid salt of 1-2-butyl-2-iminopyrrolidine (7.99 g.; 0.025 mole) is converted to free base (3.5 g.; 0.025 mole) by adding 2.5 ml. of 50% NaOH to an aqueous slurry of the salt and benzene extraction. After drying over K2CO3, the benzene solution is filtered through diatomaceous earth and 4.19 g. (0.025 mole) of 3-chloro-2-methylphenylisocyanate is added. The reaction mixture is stirred at room temperature for 3 hours and then taken to dryness in vacuo to give an oily residue of 1-(1-n-butyl-2-pyrrolidylidene)-3-(3-chloro-2-methylphenyl)urea which is dissolved in ether and converted to the hydrochloride salt. Recrystallization from methanol-ether yields the product, 1-(1-n-butyl-2-pyrrolidylidene)-3-(3-chloro-2-methylphenyl)urea HCl hydrate, m.p. = 126°-128° C.

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