Trichloromethanethiol → Tert-butyl 4-(5-chloro-1,2,4-thiadiazol-3-yl)piperazine-1-carboxylate

Participants

Reaction Steps

To a solution of tert-butyl 4-[amino(imino)methyl]piperazine-1-carboxylate (1.50 g, 5.67 mmol) and perchloromethyl mercaptan (0.609 ml, 5.67 mmol) in dichloromethane (20 ml) was added dropwise a solution of sodium hydroxide (0.907 g, 22.7 mmol) in water (2.5 ml) under ice-cooling. Then, the reaction mixture was stirred under ice-cooling for 1 hour and at room temperature for 1 hour. The organic layer was separated, washed with water, and then dried over anhydrous magnesium sulfate. The solvent was distilled off under reduced pressure, and the residue was purified by silica gel column chromatography (hexane:ethyl acetate=4:1) to give 1.03 g (59.5%) of the desired product as a solid.

Provenance & Evidence