Sodium Hydroxide → (+/-)-2-[3-chloro-4-[(4-chlorophenyl)(2-pyridinyl-thio)methyl]phenyl]-1,2,4-triazine-3,5(2H,4H)-dione

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Reaction Steps

A mixture of 2-[3-chloro-4-[chloro(4-chlorophenyl)methyl]phenyl]-1,2,4-triazine-3,5(2H,4H)-dione (0.015 mol) and 2-mercaptopyridine (0.04 mol) in THF (100 ml) was stirred overnight at RT. 1,8-diazabicyclo[5.4.0]undec-7-ene (0.03 mol) was added and the resulting reaction mixture was stirred for 3 hours. NaOH (1 N; 50 ml) was added. The mixture was stirred for 5 minutes, then extracted with EtOAc. The separated organic layer was washed with water, dried, filtered and the solvent evaporated. The aqueous layers were combined, then acidified (pH=6) with HCl (1 N). This mixture was extracted with CH2Cl2. The separated organic layer was dried, filtered, and the solvent was evaporated. The residue was purified by column chromatography over silica gel (eluent: CH2Cl2/THF/CH3OH 94/5/1). The pure fractions were collected and the solvent was evaporated. The residue was stirred overnight in diethyl ether. The solvent was evaporated. The residue was dried, yielding 2.98 g (43%) (±)-2-[3-chloro-4-[(4-chlorophenyl)(2-pyridinyl-thio)methyl]phenyl]-1,2,4-triazine-3,5(2H,4H)-dione (compound 93).

Provenance & Evidence