反应详情

2-(3-Carboxy-4-methyl-phenyl)-3,5-dioxo-2,3,4,5-tetrahydro-[1,2,4]triazine-6-carboxylic acid (110 gm) was added to 8 volumes of water with 2.4 equivalents of sodium hydroxide and 1.1 equivalents of mercaptoacetic acid. The reaction mixture was heated to reflux (100–105° C.) for approximately 18 hours at which point the reaction was complete by HPLC. 30% Sodium hydroxide and toluene were added and the resulting mixture was stirred. Upon settling a large interface was noted. More water, toluene and some ethyl acetate were added. The interface was minimized. The water layer was separated and treated with 2N HCl. At pH 2 solids precipitated out and the slurry was cooled to <10° C. The solids were filtered off in a slow filtration and dried in a vacuum oven to give 69 gm of the title compound.

1. temperatureThe reaction mixture was heated
2. temperatureto reflux (100–105° C.) for approximately 18 hours at which
3. customThe water layer was separated
4. additiontreated with 2N HCl
5. customAt pH 2 solids precipitated out
6. temperaturethe slurry was cooled to <10° C
7. filtrationThe solids were filtered off in a slow filtration
8. customdried in a vacuum oven