2-Pyrrolidone → HCID 71253079, compound

Participants

Reaction Steps

Using pyrrolidin-2-one (432 mg) and methyl 4-bromo-2-(1,1-dioxo-1λ6-isothiazolidin-2-yl)benzoate (1.54 g) described in Preparation Example 13 and by the reaction and treatment in the same manner as in Example 1, methyl 2-(1,1-dioxo-1λ6-isothiazolidin-2-yl)-4-(2-oxopyrrolidin-1-yl)benzoate (1.12 g) was obtained. The obtained methyl 2-(1,1-dioxo-1λ6-isothiazolidin-2-yl)-4-(2-oxopyrrolidin-1-yl)benzoate (1.12 g) was dissolved in a solution of methanol (5 mL) and tetrahydrofuran (5 mL), 1N aqueous sodium hydroxide solution (5 mL) was added, and the mixture was stirred at room temperature for 4 hr. The solvent was evaporated from the reaction mixture, and the mixture was neutralized with 1N hydrochloric acid, and extracted with chloroform. The organic layer was washed with saturated brine, dried over sodium sulfate, and the solvent was evaporated to give 2-(1,1-dioxo-1λ6-isothiazolidin-2-yl)-4-(2-oxopyrrolidin-1-yl)benzoic acid (720 mg). A mixture of the obtained 2-(1,1-dioxo-1λ6-isothiazolidin-2-yl)-4-(2-oxopyrrolidin-1-yl)benzoic acid (250 mg), 1-(2,4-dimethylphenyl)piperazine (154 mg) and 4-(4,6-dimethoxy[1.3.5]triazin-2-yl)-4-methylmorpholinium chloride hydrate (DMT-MM) (242 mg) was dissolved in ethanol (3 mL), and the mixture was stirred at room temperature overnight. The solvent was evaporated from the reaction mixture, water was added, and the mixture was extracted with ethyl acetate. The organic layer was washed with saturated brine, dried over sodium sulfate, and the solvent was evaporated. The obtained residue was purified by column chromatography (chloroform:methanol) to give the title compound (330 mg).

Provenance & Evidence