1-methyl-3H-2,1-benzothiazole 2,2-dioxide

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of 1,3-dihydro-2,1-benzisothiazole 2,2-dioxide (J. Heterocyclic Chem. 1986, 23, 1645., 401 mg, 2.37 mmol), methyl iodide (0.6 mL, 9.48 mmol) and potassium carbonate (328 mg, 2.37 mmol) in N,N-dimethylformamide (7 mL) was stirred for 4 h at room temperature. The reaction mixture was diluted with toluene/ethyl acetate (1/3), then washed with water for two times, and then the organic layer washed with brine, dried over sodium sulfate, and evaporated. The residue was purified by preparative thin layer chromatography on silica gel developing with hexane/ethyl acetate (2/1) to afford 272 mg (63%) of the title compound as a slight brown syrup: washed with water for two times the organic layer washed with brine dried over sodium sulfate evaporated The residue was purified by preparative thin layer chromatography on silica gel developing with hexane/ethyl acetate (2/1)

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of 1,3-dihydro-2,1-benzisothiazole 2,2-dioxide (J. Heterocyclic Chem. 1986, 23, 1645., 401 mg, 2.37 mmol), methyl iodide (0.6 mL, 9.48 mmol) and potassium carbonate (328 mg, 2.37 mmol) in N,N-dimethylformamide (7 mL) was stirred for 4 h at room temperature. The reaction mixture was diluted with toluene/ethyl acetate (1/3), then washed with water for two times, and then the organic layer was washed with brine, dried over sodium sulfate, and evaporated. The residue was purified by preparative thin layer chromatography on silica gel developing with hexane/ethyl acetate (2/1) to afford 272 mg (63%) of the title compound as a slight brown syrup: washed with water for two times the organic layer was washed with brine dried over sodium sulfate evaporated The residue was purified by preparative thin layer chromatography on silica gel developing with hexane/ethyl acetate (2/1)

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of 1,3-dihydro-2,1-benzisothiazole 2,2-dioxide (J. Heterocyclic Chem. 1986, 23, 1645., 401 mg, 2.37 mmol), methyl iodide (0.6 mL, 9.48 mmol) and potassium carbonate (328 mg, 2.37 mmol) in N,N-dimethylformamide (7 mL) was stirred for 4 h at room temperature. The reaction mixture was diluted with toluene/ethyl acetate (1/3), then washed with water for two times, and then the organic layer washed with brine, dried over sodium sulfate, and evaporated. The residue was purified by preparative thin layer chromatography on silica gel developing with hexane/ethyl acetate (2/1) to afford 272 mg (63%) of the title compound as a slight brown syrup: washed with water for two times the organic layer washed with brine dried over sodium sulfate evaporated The residue was purified by preparative thin layer chromatography on silica gel developing with hexane/ethyl acetate (2/1)