1-Methylimidazole → (+/-)-2-[3-chloro-4-[(chlorophenyl)hydroxy(1-methyl-1H-imidazol-5-yl)methyl]phenyl]-1,2,4-triazine-3,5(2H,4H)-dione monohydrate

Participants

Reaction Conditions

Reaction Steps

n-Butyllithium, 1.6M (0.0203 mol) was added dropwise at −70° C. under N2 flow to a solution of 1-methyl-1H-imidazole (0.0203 mol) in THF (60 ml). The mixture was stirred at −70° C. for 40 minutes. Chlorotriethylsilane (0.203 mol) was added quickly and the mixture was allowed to warm to 0° C. on an ice bath. The mixture was cooled to −70° C. and n-butyllithium (0.0203 mol) was added dropwise. The mixture was allowed to warm to −20° C. and cooled to −70° C. A solution of 2-[3-chloro-4-(4-chlorobenzoyl)phenyl-1,2,4-triazine-3,5(2H,4H)-dione (0.00812 mol) in THF (20 ml) was added dropwise. The mixture was allowed to warm to −5° C., then poured out into a satured NH4Cl solution and ice, and extracted with EtOAc. The organic layer was separated, dried, filtered and the solvent was evaporated. The residue was purified by column chromatography over silica gel (eluent: CH2Cl2/CH3OH 96/4). The pure fractions were collected and the solvent was evaporated. The residue (0.85 g) was crystallized from 2-propanone and diethyl ether. The precipitate was filtered off and dried, yielding 0.47 g (13%) of (±)-2-[3-chloro-4-[(chlorophenyl)hydroxy(1-methyl-1H-imidazol-5-yl)methyl]phenyl]-1,2,4-triazine-3,5(2H,4H)-dione monohydrate (compound 121).

Provenance & Evidence