反应详情

N,N-dimethylformamide (8 drops) is added to a mixture of 5-[3,6-dihydro-3-methyl-2,6-dioxo-4-(trifluoromethyl)-1(2H)-pyrimidinyl)-α,α-dimethyl-1,2-benzisothiazole-3-acetic acid (0.800 g, 0.00194 mol) and methylene chloride. The mixture is cooled on an ice bath and oxalyl chloride (2.0 M in methylene chloride, 2.42 ml, 0.00485 mol) is added. The resultant mixture is stirred one hour on an ice bath and concentrated in vacuo. The residue is taken up in tetrahydrofuran. N,N-Diisopropylaminosulfonamide (0.410 g, 0.00278 mol), ethyldiisopropylamine (0.310 g, 0.00240 mol) and dimethylaminopyridine (0.0100 g) are added and the resultant mixture is stirred overnight at room temperature. The mixture is then filtered and the filtrate is concentrated in vacuo to afford a yellow resin. The resin is filtered through silica gel to afford the title compound as a tan resin (0.500 g, 44.8%).

1. temperatureThe mixture is cooled on an ice bath
2. concentrationconcentrated in vacuo
3. filtrationThe mixture is then filtered
4. concentrationthe filtrate is concentrated in vacuo
5. customto afford a yellow resin
6. filtrationThe resin is filtered through silica gel