Patent ID: 9676735
Date: 2017-06-13
CPC Classifications: B01J,C07C,C07D,C07F

Claim:
1. A process for the preparation of 6-chloro-4-(2-cyclopropylethynyl)-4-(trifluoromethyl)-1H-3,1-benzoxazin-2-one comprising reacting 4-cyclopropyl-2-(2,5-dichloro-phenyl)-1,1,1-trifluoro-but-3-yn-2-ol with at least one cyanate in the presence of at least one transition metal compound; wherein the at least one cyanate is selected from the group consisting of alkali cyanates and alkaline earth cyanates; and wherein the at least one transition metal compound is selected from the group consisting of copper, nickel, palladium, rhodium and platinum compounds.