4-Toluenesulfonyl chloride → HCID 13015892, compound

Participants

Reaction Steps

A solution of 1.5 g. (4.6 mmole) of 1-(2-hydroxy ethyl)-2-(2-t-butoxycarbonylaminoethyl)-6-chlorobenzimidazole prepared in Step B. above and 1.0 g. (5.5 mmole) p-toluenesulfonyl chloride in 7.5 ml. of dry pyridine is heated at 50° C. for 2 hours. After cooling the reaction mixture is partitioned between dichloromethane and saturated sodium hydrogencarbonate solution. The organic extracts are dried with calcium sulfate and concentrated to remove solvent. The remaining pyridine is removed by azeotroping with toluene. The desired product, 1.6 g. (70%), is obtained as a crystalline solid.

Provenance & Evidence