1,4'-Bipiperidine → 4-Piperidinopiperidine-1-carbonyl chloride

Participants

Reaction Steps

In a solution of Triphosgene (16.48 gm) in methylene chloride (200 ml) was added a solution of 4-piperidinopiperidine (20 g) in methylene chloride (200 ml) at 20-25° C. within 1-2 hours. Part of the methylene chloride was distilled off and acetonitrile was added. Further, methylene chloride and acetonitrile was distilled off completely until the temperature rises to 70° C. At room temperature fresh methylene chloride was added to the reaction mixture to make homogenous slurry followed by potassium carbonate (30-35 gm) and reaction mixture was stirred for 1-2 hours. The reaction mixture was filtered and subsequently the filtrate was concentrated. Hexane was added slowly into the reaction mixture under stirring. Solid compound so obtained was filtered, washed with hexane and dried under reduced pressure at about 40° C.

Provenance & Evidence