Sulfuric Acid → HCID 18402914, compound

Participants

Reaction Steps

3-[4-Chloro-2-fluoro-5-(4-aminophenoxy)phenyl]-6-trifluoromethyl-1,2,3,4-tetrahydro-pyrimidine-2,4-dione (2.0 g) was mixed with hot 30% sulfuric acid (5 ml) and ic/water (5.0 g) was added. The mixture kept at 10° C. while a solution of sodium nitrite (0.45 g) in water (5 ml) was slowly introduced at the bottom of the stirred mixture. After stirring for 10 minutes, urea (0.1 g) was added, followed by a solution of copper(2)nitrate (18.0 g) in water (170 ml), and copper(1)oxide (0.7 g). The mixture was stirred for 10 minutes, extracted with diethyl ether (50 ml×3), and dried over sodium sulfate. The crude product was purified by column chromatography (hexane:ethyl acetate, 4:1) to give 3-[4-chloro -2-fluoro-5-(4-hydroxyphenoxy)phenyl]-6-trifluoromethyl-1,2,3,4-tetrahydropyrimidine-2,4-dione (Intermediate 11-31), (1.0 g).

Provenance & Evidence