Dicyclohexylcarbodiimide → N,N'-Dicyclohexylurea

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A mixture of 383 mg. (1 mmole) of 2-(4-(3,5- dichlorophenylureido)phenoxy)-2-methyl-propionic acid prepared according to Example 4 of U.S. Pat. No. 5,093,367 and 126 mg. (1.1 mmole) of N-hydroxysuccinimide, 26 mg. (1.1 mmole) of dicyclohexylcarbodiimide in 15 ml of tetrahydrofuran was stirred at room temperature for 4 hours, Dicyclohexylurea formed and was filtered off. The solid product was washed with 5 ml of tetrahydrofuran and evaporation under vacuum yielded 450 mg of a powder. mp 106-162° C. The NMR and elemental 2 analysis is consistent with the N-hydroxysuccinimide ester of 2-(4-(3,5-dichlorophenylureido)phenoxy)-2-methyl-propionic acid.

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