Citric Acid → HCID 10272047, compound

Participants

Reaction Steps

A solution of 4-tert-butyl-2-aminopyridine (0.177 g, 1.18 mmol, 1 equiv.) in 1.2 mL of anh. CH2Cl2 (1.2 mL) was added to CDI (0.200 g, 1.24 mmol, 1.05 equiv) and the mixture was allowed to stir under argon at room temperature 1 d. To the resulting solution was added 4-(4-chlorophenoxy)aniline (0.259 g, 1.18 mmol, 1 equiv.) in one portion. The resulting mixture was stirred at room temperature for 1 d, then was treated with a 10% citric acid solution (2 mL) and allowed to stir for 1 h. The resulting organic layer was extracted with EtOAc (3×5 mL). The combined organic layers were dried (MgSO4) and concentrated in vacuo. The resultant residue was treated with CH2Cl2 (10 mL) and a 1 N aqueous NaOH solution. This mixture was allowed to stir overnight. The resulting organic layer was extracted with CH2Cl2 (3×5 mL). The combined organic layers were (MgSO4) and concentrated in vacuo. The resultant solids were suspended in diethyl ether (10 mL) and sonicated for 15 minutes. The resulting white solids were dried to give N-(4-tert-butylpyridyl)-N′-(4-(4-chlorophenoxy)phenyl) urea (42 mg, 9%): mp 198-199° C. B3. Reaction of Substituted Aniline with N,N′-Carbonyldiimidazole Followed by Reaction with a Heterocyclic Amine

Provenance & Evidence