4-Aminophenol → N-[4-Chloro-3-(trifluoromethyl)phenyl]-N'-(4-hydroxyphenyl)urea

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Reaction Steps

As shown in Scheme 1, in the presence of N,N′-carbonyldiimidazole, phosgene or triphosgene, 4-aminophenol (Compound I) reacts with 3-trifluoromethyl-4-chloro-aniline (Compound II) to give 1-(4-chloro-3-(trifluoromethyl)phenyl)-3-(4-hydroxyphenyl)urea (Compound III). 2-(N-(methyl-d3))carbamoyl pyridine (Compound V) is obtained by reacting methyl picolinate (Compound IV) with (methyl-d3)amine or (methyl-d3)amine hydrochloride directly or in the presence of the base such as sodium carbonate, potassium carbonate, sodium hydroxide, triethylamine, pyridine and the like. In the presence of base (such as potassium tert-butoxide, sodium hydride, potassium hydride, potassium carbonate, cesium carbonate, potassium phosphate, potassium hydroxide, sodium hydroxide) and an optional catalyst (such as cuprous iodide and proline, or cuprous iodide and picolinic acid), Compound III reacts with Compound V to form compound CM-4307. The above reactions are conducted in an inert solvent, such as dichloromethane, dichloroethane, acetonitrile, n-hexane, toluene, tetrahydrofuran, N,N-dimethylformamide, dimethyl sulfoxide and so on, and at a temperature of 0-200° C.

Provenance & Evidence