1,3-dibromobutane

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

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

Procedure: In analogy to example 2.1, 3-Methyl-benzo[d]isothiazol-6-ol and 1,3-dibromobutane were converted to yield 6-(4-Bromo-butoxy)-3-methyl-benzo[d]isothiazole as brown oil, MS: 300 (MH+, 1 Br).

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

Procedure: Formaldehyde dimethyl mercaptal S-oxide (1.571 g) was dissolved in 15 ml. of tetrahydrofuran, and 8.9 ml. of an n-hexane solution of n-butyl lithium (1.4 millimols/milliliter) was added at -10° C. The mixture was stirred for 80 minutes, and then at -70° C., 1.125 g of 1,3-dibromobutane was added, and the mixture was stirred for 46.5 hours at room temperature. Methylene chloride (100 ml) was added. The mixture was washed with water and dried with anhydrous magnesium sulfate. It was concentrated at reduced pressure, and the residue was separated by column chromatography (Florisil, eluted with methylene chloride) to afford 746 mg of 2-methylcyclobutanone dimethyl mercaptal S-oxide. The product was oxidized with hydrogen peroxide and Na2WO4 to form its disulfone derivative. the mixture was stirred for 46.5 hours at room temperature The mixture was washed with water dried with anhydrous magnesium sulfate It was concentrated at reduced pressure the residue was separated by column chromatography (Florisil, eluted with methylene chloride)

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

Procedure: In analogy to example 2.1, 3-Methyl-benzo[d]isothiazol-6-ol and 1,3-dibromobutane were converted to yield 6-(4-Bromo-butoxy)-3-methyl-benzo[d]isothiazole as brown oil, MS: 300 (MH+, 1 Br).

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

Procedure: In analogy to example 2.1, 3-Methyl-benzo[d]isothiazol-6-ol and 1,3-dibromobutane were converted to yield 6-(4-Bromo-butoxy)-3-methyl-benzo[d]isothiazole as brown oil, MS: 300 (MH+, 1 Br).

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

Procedure: Using the procedure of Example I, tetraisopropyl methane diphosphonate was converted to tetraisopropyl 2-methyl cyclobutane-1,1 diphosphonate by reaction with 1,3 dibromobutane at 80° C. for 4 hours. 31P NMR (CDCl3) chemical shift 24.1 ppm.

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

Procedure: In analogy to example 2.1, 3-Methyl-benzo[d]isothiazol-6-ol and 1,3-dibromobutane were converted to yield 6-(4-Bromo-butoxy)-3-methyl-benzo[d]isothiazole as brown oil, MS: 300 (MH+, 1 Br).

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

Procedure: To a solution of potassium t-butoxide (0.12 g, 1 mmol, 1 eq) in anhydrous DMSO (5 mL) at room temperature under dry N2 atmosphere was added 5′-{[pyrrolidin-1-yl]sulfonyl}spiro[1,3-dioxane-2,3′-indol]-2′(1′H)-one (previously described in step 2, Example 12) (0.33 g, 1 mmol). After stirring for 10 minutes, 1,3-dibromobutane (0.22 g, 1 mmol, 1 eq) was added dropwise to the reaction over a 5 minute period. The reaction mixture was stirred at room temperature for one hour. The mixture was poured into H2O (20 ml) and exhaustively extracted with EtOAc. The combined organic extracts were dried over Na2SO4, filtered and concentrated. The crude product was purified by flash chromatography on silica gel using 30% EtOAc/hexane to give the title compound as an off white solid (0.23 g, 50% yield). NMR (400 MHz, DMSO-d6): consistent. MS: (API-ES+) m/z 474 [M+H]. The reaction mixture was stirred at room temperature for one hour exhaustively extracted with EtOAc The combined organic extracts were dried over Na2SO4 filtered concentrated The crude product was purified by flash chromatography on silica gel using 30% EtOAc/hexane

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

Procedure: To a solution of potassium t-butoxide (0.12 g, 1 mmol, 1 eq) in anhydrous DMSO (5 mL) at room temperature under dry N2 atmosphere was added 5′-{[pyrrolidin-1-yl]sulfonyl}spiro[1,3-dioxane-2,3′-indol]-2′(1′H)-one (previously described in step 2, Example 12) (0.33 g, 1 mmol). After stirring for 10 minutes, 1,3-dibromobutane (0.22 g, 1 mmol, 1 eq) was added dropwise to the reaction over a 5 minute period. The reaction mixture was stirred at room temperature for one hour. The mixture was poured into H2O (20 ml) and exhaustively extracted with EtOAc. The combined organic extracts were dried over Na2SO4, filtered and concentrated. The crude product was purified by flash chromatography on silica gel using 30% EtOAc/hexane to give the title compound as an off white solid (0.23 g, 50% yield). NMR (400 MHz, DMSO-d6): consistent. MS: (API-ES+) m/z 474 [M+H]. The reaction mixture was stirred at room temperature for one hour exhaustively extracted with EtOAc The combined organic extracts were dried over Na2SO4 filtered concentrated The crude product was purified by flash chromatography on silica gel using 30% EtOAc/hexane

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

Procedure: A mixture of 5.0 g of 2,4-dihydroxy-3-propylacetophenone, 11.1 g of 1,3-dibromobutane, 6.0 g of potassium carbonate and 50 mg of tetra-n-butylammonium bromide in 130 ml of acetone was refluxed overnight. After cooling, the insoluble matter was filtered off, and the filtrate was concentrated. The residue was purified by silica gel column chromatography (eluent:hexane-ethyl acetate=8:1) to give 2.47 g of 1-[4-(3-bromobutoxy)-2-hydroxy-3-propylphenyl]ethanone. Melting point 53°-55° C. was refluxed overnight After cooling the insoluble matter was filtered off the filtrate was concentrated The residue was purified by silica gel column chromatography (eluent:hexane-ethyl acetate=8:1)