3-bromo-2,2-dimethylpropan-1-ol

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:

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

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

Procedure: 4-Propyl-cyclohexanecarboxylic acid (10.0 g, 58.0 mmol), 3-bromo-2,2-dimethyl-propan-1-ol (10.0 g, 59.9 mmol) and a catalytic amount of para-toluene sulphonic acid are stirred under reflux in toluene (300 ml) in a flask equipped with Dean-Stark apparatus over night. The solution is allowed to cool to room temperature, is washed with aqueous sodium carbonate and water, dried and evaporated to dryness. Purification is achieved by filtration through a silica pad using petrol as eluant. Evaporation of the appropriate fractions gives 4-propyl-cyclohexanecarboxylic acid 3-bromo-2,2-dimethyl-propyl ester as a liquid. The structure is confirmed by GCMS. equipped with Dean-Stark apparatus over night is washed with aqueous sodium carbonate and water dried evaporated to dryness Purification is achieved by filtration through a silica pad Evaporation of the appropriate fractions

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

Procedure: A mixture of 4-(6-fluoro-1,2-benzisoxazol-3-yl) piperidine (3.0 g, 13.6 mmol), K2CO3 (12.5 g, 17.5 mmol), 3-bromo-2,2-dimethyl-1-propanol (3 g, 21 mmol, 1.5 eq.), tetra-butylammonium hydrogen sulfate (1 g, phase transfer catalyst) in water (5 ml) and acetonitrile (150 ml) was heated at reflux for 43 days. TLC showed a small spot for the expected product. The mixture was diluted with EtOAc (400 ml) and washed with brine. The organic solution was dried and concentrated to a dark brown mixture. The crude mixture was purified carefully by flash chromatography (SiO2, 95 g to afford the dried pure product; 260 mg, (6%) as an oil. This oil was converted to the fumarate salt by treatment with fumaric acid (98.5 mg, 1.0 eq.) in ethanol. Recrystallization from ethanol:ether yielded 210 mg of white crystals, m.p.=144-145° C. was heated at reflux for 43 days

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

Procedure: A mixture of 4-(6-fluoro-1,2-benzisoxazol-3-yl)piperidine (3.0 g, 13.6 mmol), K2CO3 (12.5 g, 17.5 mmol), 3-bromo-2,2-dimethyl-1-propanol (3 g, 21 mmol, 1.5 eq.), tetra-butylammonium hydrogen sulfate (1 g, phase transfer catalyst) in water (5 ml) and acetonitrile (150 ml) was heated at reflux for 43 days. TLC showed a small spot for the expected product. The mixture was diluted with EtOAc (400 ml) and washed with brine. The organic solution was dried and concentrated to a dark brown mixture. The crude mixture was purified carefully by flash chromatography (SiO2, 95 g to afford the dried pure product; 260 mg, (6%) as an oil. This oil was converted to the fumarate salt by treatment with fumaric acid (98.5 mg, 1.0 eq.) in ethanol. Recrystallization from ethanol:ether yielded 210 mg of white crystals, m.p.=144°-145° C. was heated at reflux for 43 days

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

Procedure: A mixture of 4-(6-fluoro-1,2-benzisoxazol-3-yl)piperidine (3.0 g, 13.6 mmol), K2CO3 (12.5 g, 17.5 mmol), 3-bromo-2,2-dimethyl-1-propanol (3 g, 21 mmol, 1.5 eq.), tetra-butylammonium hydrogen sulfate (1 g, phase transfer catalyst) in water (5 ml) and acetonitrile (150 ml) was heated at reflux for 43 days. TLC showed a small spot for the expected product. The mixture was diluted with EtOAc (400 ml) and washed with brine. The organic solution was dried and concentrated to a dark brown mixture. The crude mixture was purified carefully by flash chromatography (SiO2, 95 g to afford the dried pure product; 260 mg, (6%) as an oil. This oil was converted to the fumarate salt by treatment with fumaric acid (98.5 mg, 1.0 eq.) in ethanol. Recrystallization from ethanol:ether yielded 210 mg of white crystals, m.p.=144°-145° C. was heated at reflux for 43 days

Conditions: temp:90.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a mixture of 4-bromophenol (300 mg, 1.74 mmol) in DMF (10 mL) was added 3-bromo-2,2-dimethylpropan-1-ol (579 mg, 3.47 mmol) and potassium carbonate (720 mg, 5.22 mmol). The mixture was degassed with nitrogen three times and heated to 90° C. for 48 h. The mixture was cooled to room temperature and then filtered. The filtrate was concentrated in vacuo to give a residue, which was purified by flash chromatography (EtOAc/petroleum ether=1:10 to 1:1) to give 3-(4-bromophenoxy)-2,2-dimethylpropan-1-ol (130 mg, 29%) as a yellow oil. 1H NMR (400 MHz, CDCl3) δ 7.37 (d, 2H), 6.79 (d, 2H), 3.73 (s, 2H), 3.54 (s, 2H), 1.02 (s, 6H). The mixture was degassed with nitrogen three times The mixture was cooled to room temperature filtered The filtrate was concentrated in vacuo to give a residue, which was purified by flash chromatography (EtOAc/petroleum ether=1:10 to 1:1)

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

Procedure: To a solution of 18.35 g of phosphorous oxychloride in 55 ml of carbon tetrachloride was added dropwise a solution of 3-bromo-2,2-dimethyl-1-propanol in 20 ml of carbon tetrachloride. This mixture was stirred overnight, evaporated in vacuo, then evaporated twice from toluene at 35° C. and dried. The residue was distilled on a Kugelrohr 100° C., 0.3 mm giving the desired compound as a colorless oil. evaporated in vacuo evaporated twice from toluene at 35° C. dried The residue was distilled on a Kugelrohr 100° C., 0.3 mm

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

Procedure: Pyrrolidine (1.82 g, 25 mmol), K2CO3 (3.0 g, 1.04 eq.), 3-bromo-2,2-dimethyl-propan-1-ol (8.45 g, 50 mmol, 2 eq.) were heated together at 90° C. overnight. The reaction was allowed to cool to room temperature and quenched with 2M HCl solution (50 ml) and extracted with TBME (3×50 ml). The aqueous phase was basified to pH 14 with 2M NaOH solution and extracted with DCM (3×50 ml). The combined organic extracts were dried over MgSO4, filtered, washed with DCM and concentrated in vacuo to give the title compound (1.03 g, 26%) as a pale yellow oil. quenched with 2M HCl solution (50 ml) extracted with TBME (3×50 ml) extracted with DCM (3×50 ml) The combined organic extracts were dried over MgSO4 filtered washed with DCM concentrated in vacuo