Thionyl Chloride → N-(4-[2-(4-methyl-2-oxo-piperidine-1-carboxamido)-ethyl]-benzenesulfonyl)-N'-butyl urea

Participants

Reaction Conditions

Reaction Steps

0.6 g of 4-[2-(4-methyl-2-oxo-piperidine-1-carboxamido)-ethyl]-benzenesulfinic acid (crude product m.p. 113°-115° C., prepared by reaction of 4-[2-(4-methyl-2-oxo-piperidine-1-carboxamido)-ethyl]-benzenesulfochloride with sodium sulfite) and 0.3 g of N-hydroxy-N'-butyl urea are dissolved in 50 ml of dioxan. 0.4 g of thionyl chloride in 10 ml of dioxan is added dropwise to this solution, and the batch is heated for 2 hours at 60° C. Subsequently, the solvent is evaporated under reduced pressure, water is added dropwise to the residue, the oily substance is separated and reprecipitated from ammonia. The N-(4-[2-(4-methyl-2-oxo-piperidine-1-carboxamido)-ethyl]-benzenesulfonyl)-N'-butyl urea obtained has a melting point of 155°-157° C., and, with the substance obtained according to Example 8, shows no depression.

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