4-Methoxybenzenesulfonyl chloride → HCID 86585804, compound

Participants

Reaction Steps

A solution of 4-methoxybenzenesulfonyl chloride (284 mg) in dioxane (2 ml) was added to a solution of (2R,3R)-N-benzyloxy-4-methanesulfonyl-3-methyl-2-piperazinecarboxamide hydrochloride (200 mg) in pyridine (2 ml) with cooling on an ice bath. The mixture was stirred at ambient temperature for 3.5 hours. 4-Methoxybenzene-sulfonyl chloride (60 mg) in dioxane (1 ml) was added thereto, and the mixture was stirred at ambient temperature for 2 hours. 4-Methoxybenzenesulfonyl chloride (60 mg) in dioxane (1 ml) was added to the mixture. The reaction mixture was stirred at ambient temperature for 2 hours, and the reaction was quenched by adding 3-(N,N-dimethyl-amino)propylamine (0.1 ml). The mixture was partitioned between 0.6N HCl and AcOEt. The organic layer was washed with 0.6N HCl, saturated aqueous NaHCO3 solution and saturated aqueous NaCl solution, dried over MgSO4 and concentrated in vacuo. The residue was purified by SiO2 column chromatography (eluent: AcOEt in n-hexane 60% to 80%) to give 273 mg of (2R,3R)-N-benzyloxy-4-methanesulfonyl-1-(4-methoxy-benzenesulfonyl)-3-methyl-2-piperazinecarboxamide as an amorphous powder.

Provenance & Evidence