2-(T-Butyldimethylsilyloxy)-4-bromoanisole

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

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

Procedure: (5-Bromo-2-methoxyphenoxy)-tert-butyldimethylsilane (0.98 g, 3.09 mmol), n-butyl lithium (1.24 ml, 3.09 mmol), and 3,5-dimethoxybenzaldehyde (0.47 g, 2.81 mmol) were treated in the same manner as described above for the synthesis of (2,3-drihydrobenzo[1,4]dioxin-6-yl)-(3,5-dimethoxyphenyl)methanol. The crude material was purified via flash column chromatography (5% EtOAc in hexane gradient to 30% EtOAc in hexane in about 40 min.) to give [3-(tert-butyl-dimethyl-silanyloxy)-4-methoxy-phenyl]-(3,5-dimethoxy-phenyl)-methanol as an oil (0.79 g, 69%), HPLC purity was 98.3% at 2.55 min. (90/10 ACN/0.1% H3PO4): 1HNMR (CDCl3) δ 6.92-6.78 (m, 3H, Ar), 6.53 (d, J=2 Hz, 2H, Ar), 6.35 (t, J=2 Hz, 1H, Ar), 5.66 (d, J=3 Hz, 1H, CH), 3.78 (s, 3H, single OCH3), 3.76 (s, 6H, 2OCH3), 2.15 (d, J=3 Hz, 1H, OH), 0.97 (s, 9H, 3OCH3), 0.13 (s, 6H, 2OCH3). The product was carried over to the next step. The crude material was purified via flash column chromatography (5% EtOAc in hexane gradient to 30% EtOAc in hexane in about 40 min.)

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

Procedure: Ethyldiisopropylamine (1.72 ml, 9.85 mmol) was added to a solution of 5-bromo-2-methoxy-phenol (0.80 g, 3.94 mmol) in DMF (10 ml) at rt. The clear, colorless solution was stirred for 5 min. followed by addition of tert-butylchlorodimethylsilane (0.71 g, 4.73 mmol). The reaction was complete in about two hours. Distilled water (˜6 ml) was added to the clear solution, stirred for 10 min., added ether (50 ml) and sat. NaHCO3 (10 ml), stirred for 30 min. The ether portion was separated and the aqueous phase was extracted with ether (2×50 ml). The combined ether phases were washed with water (100 ml), brine (60 ml), dried over MgSO4, filtered and concentrated to an oil, which was further purified by flash column chromatography [100% hexane with 0.5% triethylamine gradient to 30% EtOAc in hexane with 0.5% Et3N] to give (5-bromo-2-methoxy-phenoxy)-tert-butyl-dimethyl-silane as an oil (0.59 g, 99%), HPLC purity 99.5% at 1.43 min. (90/10 ACN/0.1% H3PO4): 1H NMR (DMSO-d6) δ 7.04-6.97(m, 2H, Ar), 6.71 (d, J=8 Hz, Ar), 3.78 (s, 3H, single OCH3), 0.99 (s, 9H, 30CH3), 0.16 (s, 6H, 2OCH3). The product was carried over to the next step. The reaction was complete in about two hours stirred for 10 min. stirred for 30 min The ether portion was separated the aqueous phase was extracted with ether (2×50 ml) The combined ether phases were washed with water (100 ml), brine (60 ml) dried over MgSO4 filtered concentrated to an oil, which was further purified by flash column chromatography [100% hexane with 0.5% triethylamine gradient to 30% EtOAc in hexane with 0.5% Et3N]

Conditions: temp:-78.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of (5-bromo-2-methoxy-phenoxy)-tert-butyl-dimethyl-silane (2 g, 6.32 mmol) dissolved in tetrahydrofuran (25 mL) at −78° C. under nitrogen is dropwisely added 1.7 M of tert-butyllithium (8.06 mL, 12.6 mmol). The reaction mixture is stirred at −78° C. for 5 minutes. Then, the solution of 2-chloro-5-formyl-benzenesulfonamide (0.462 g, 2.11 mmol) in tetrahydrofuran (5 mL) is added slowly. The reaction mixture is warmed up to room temperature and stirred for 24 h. The reaction is quenched with 1 N of HCl, and extracted with ethyl acetate three times. The combined organic extracts are washed with a saturated sodium chloride solution, dried with magnesium sulfate, and concentrated in vacuo. Purification by silica gel chromatography (50% ethyl acetate-hexane) provides 0.57 g (59%) of the title compound as a brown oil. 1H NMR (CDCl3): δ 8.00 (m, 1H), 7.40 (m, 2H), 6.70 (d, 3H), 5.70 (s, 1H), 5.00 (m, 2H), 3.70 (s, 3H), 0.90 (s, 9H), 0.05 (s, 6H). The reaction mixture is warmed up to room temperature stirred for 24 h The reaction is quenched with 1 N of HCl extracted with ethyl acetate three times The combined organic extracts are washed with a saturated sodium chloride solution dried with magnesium sulfate concentrated in vacuo Purification by silica gel chromatography (50% ethyl acetate-hexane)

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

Procedure: To a solution of 5-bromo-2-methoxy-phenol (3.5 g, 17.2 mmol) dissolved in methylene chloride (50 mL) are added triethylamine (2.08 g, 20.6 mmol) and 4-dimethylaminopyridine (0.15 g, 0.86 mmol). Then tert-butyldimethylsilyl chloride is added slowly and the reaction mixture is stirred at room temperature for 16 h. The reaction is quenched with 10% of citric acid, and then the organic layer is washed with saturated sodium bicarbonate solution, a saturated sodium chloride solution, dried with magnesium sulfate, and concentrated in vacuo. Purification by silica gel chromatography (15% ethyl acetate-hexane) provides 5.6 g (100%) of the title compound as a colorless oil. 1H NMR (CDCl3): δ 6.82 (m, 2H), 6.58 (d, J=9 Hz, 1H), 3.74 (s, 3H), 0.95 (s, 9H), 0.05 (s, 6H). The reaction is quenched with 10% of citric acid the organic layer is washed with saturated sodium bicarbonate solution a saturated sodium chloride solution, dried with magnesium sulfate concentrated in vacuo Purification by silica gel chromatography (15% ethyl acetate-hexane)

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

Procedure: (5-Bromo-2-methoxyphenoxy)-tert-butyldimethylsilane (0.98 g, 3.09 mmol), n-butyl lithium (1.24 ml, 3.09 mmol), and 3,5-dimethoxybenzaldehyde (0.47 g, 2.81 mmol) were treated in the same manner as described above for the synthesis of (2,3-dihydrobenzo[1,4]dioxin-6-yl)-(3,5-dimethoxyphenyl)methanol. The crude material was purified via flash column chromatography (5% EtOAc in hexane gradient to 30% EtOAc in hexane in about 40 min.) to give [3-(tert-butyl-dimethyl-silanyloxy)-4-methoxy-phenyl]-(3,5-dimethoxyphenyl)-methanol as an oil (0.79 g, 69%), HPLC purity was 98.3% at 2.55 min. (90/10 ACN/0.1% H3PO4): 1HNMR (CDCl3) δ 6.92-6.78 (m, 3H, Ar), 6.53 (d, J=2 Hz, 2H, Ar), 6.35 (t, J=2 Hz, 1H, Ar), 5.66 (d, J=3 Hz, 1H, CH), 3.78 (s, 3H, single OCH3), 3.76 (s, 6H, 2OCH3), 2.15 (d, J=3 Hz, 1H, OH), 0.97 (s, 9H, 3OCH3), 0.13 (s, 6H, 2OCH3). The product was carried over to the next step. The crude material was purified via flash column chromatography (5% EtOAc in hexane gradient to 30% EtOAc in hexane in about 40 min.)

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

Procedure: (5-Bromo-2-methoxyphenoxy)-tert-butyldimethylsilane (0.98 g, 3.09 mmol), n-butyl lithium (1.24 ml, 3.09 mmol), and 3,5-dimethoxybenzaldehyde (0.47 g, 2.81 mmol) were treated in the same manner as described above for the synthesis of (2,3-dihydrobenzo[1,4]dioxin-6-yl)-(3,5-dimethoxyphenyl)methanol. The crude material was purified via flash column chromatography (5% EtOAc in hexane gradient to 30% EtOAc in hexane in about 40 min.) to give [3-(tert-butyl-dimethyl-silanyloxy)-4-methoxy-phenyl]-(3,5-dimethoxyphenyl)-methanol as an oil (0.79 g, 69%), HPLC purity was 98.3% at 2.55 min. (90/10 ACN/0.1% H3PO4): 1HNMR (CDCl3) δ 6.92-6.78 (m, 3H, Ar), 6.53 (d, J=2 Hz, 2H, Ar), 6.35 (t, J=2 Hz, 1H, Ar), 5.66 (d, J=3 Hz, 1H, CH), 3.78 (s, 3H, single OCH3), 3.76 (s, 6H, 2OCH3), 2.15 (d, J=3 Hz, 1H, OH), 0.97 (s, 9H, 3OCH3), 0.13 (s, 6H, 2OCH3). The product was carried over to the next step. The crude material was purified via flash column chromatography (5% EtOAc in hexane gradient to 30% EtOAc in hexane in about 40 min.)

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

Procedure: Ethyldiisopropylamine (1.72 ml, 9.85 mmol) was added to a solution of 5-bromo-2-methoxy-phenol (0.80 g, 3.94 mmol) in DMF (10 ml) at rt. The clear, colorless solution was stirred for 5 min. followed by addition of tert-butylchlorodimethylsilane (0.71 g, 4.73 mmol). The reaction was complete in about two hours. Distilled water (˜6 ml) was added to the clear solution, stirred for 10 min., added ether (50 ml) and sat. NaHCO3 (10 ml), stirred for 30 min. The ether portion was separated and the aqueous phase was extracted with ether (2×50 ml). The combined ether phases were washed with water (100 ml), brine (60 ml), dried over MgSO4, filtered and concentrated to an oil, which was further purified by flash column chromatography [100% hexane with 0.5% triethylamine gradient to 30% EtOAc in hexane with 0.5% Et3N] to give (5-bromo-2-methoxy-phenoxy)-tert-butyl-dimethyl-silane as an oil (0.59 g, 99%), HPLC purity 99.5% at 1.43 min. (90/10 ACN/0.1% H3PO4): 1H NMR (DMSO-d6) δ 7.04-6.97(m, 2H, Ar), 6.71 (d, J=8 Hz, Ar), 3.78 (s, 3H, single OCH3), 0.99 (s, 9H, 3OCH3), 0.16 (s, 6H, 2OCH3). The product was carried over to the next step. The reaction was complete in about two hours stirred for 10 min. stirred for 30 min The ether portion was separated the aqueous phase was extracted with ether (2×50 ml) The combined ether phases were washed with water (100 ml), brine (60 ml) dried over MgSO4 filtered concentrated to an oil, which was further purified by flash column chromatography [100% hexane with 0.5% triethylamine gradient to 30% EtOAc in hexane with 0.5% Et3N]

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

Procedure: Ethyldiisopropylamine (1.72 ml, 9.85 mmol) was added to a solution of 5-bromo-2-methoxy-phenol (0.80 g, 3.94 mmol) in DMF (10 ml) at rt. The clear, colorless solution was stirred for 5 min. followed by addition of tert-butylchlorodimethylsilane (0.71 g, 4.73 mmol). The reaction was complete in about two hours. Distilled water (˜6 ml) was added to the clear solution, stirred for 10 min., added ether (50 ml) and sat. NaHCO3 (10 ml), stirred for 30 min. The ether portion was separated and the aqueous phase was extracted with ether (2×50 ml). The combined ether phases were washed with water (100 ml), brine (60 ml), dried over MgSO4, filtered and concentrated to an oil, which was further purified by flash column chromatography [100% hexane with 0.5% triethylamine gradient to 30% EtOAc in hexane with 0.5% Et3N] to give (5-bromo-2-methoxy-phenoxy)-tert-butyl-dimethyl-silane as an oil (0.59 g, 99%), HPLC purity 99.5% at 1.43 min. (90/10 ACN/0.1% H3PO4): 1H NMR (DMSO-d6) δ 7.04-6.97(m, 2H, Ar), 6.71 (d, J=8 Hz, Ar), 3.78 (s, 3H, single OCH3), 0.99 (s, 9H, 3OCH3), 0.16 (s, 6H, 2OCH3). The product was carried over to the next step. The reaction was complete in about two hours stirred for 10 min. stirred for 30 min The ether portion was separated the aqueous phase was extracted with ether (2×50 ml) The combined ether phases were washed with water (100 ml), brine (60 ml) dried over MgSO4 filtered concentrated to an oil, which was further purified by flash column chromatography [100% hexane with 0.5% triethylamine gradient to 30% EtOAc in hexane with 0.5% Et3N]

Conditions: temp:-78.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of (5-bromo-2-methoxy-phenoxy)-tert-butyl-dimethyl-silane (2 g, 6.32 mmol) dissolved in tetrahydrofuran (25 mL) at −78° C. under nitrogen is dropwisely added 1.7 M of tert-butyllithium (8.06 mL, 12.6 mmol). The reaction mixture is stirred at −78° C. for 5 minutes Then, the solution of 2-chloro-5-formyl-benzenesulfonamide (0.462 g, 2.11 mmol) in tetrahydrofuran (5 mL) is added slowly. The reaction mixture is warmed up to room temperature and stirred for 24 h. The reaction is quenched with 1 N of HCl, and extracted with ethyl acetate three times. The combined organic extracts are washed with a saturated sodium chloride solution, dried with magnesium sulfate, and concentrated in vacuo. Purification by silica gel chromatography (50% ethyl acetate-hexane) provides 0.57 g (59%) of the title compound as a brown oil. 1H NMR (CDCl3): δ 8.00 (m, 1H), 7.40 (m, 2H), 6.70 (d, 3H), 5.70 (s, 1H), 5.00 (m, 2H), 3.70 (s, 3H), 0.90 (s, 9H), 0.05 (s, 6H). The reaction mixture is warmed up to room temperature stirred for 24 h The reaction is quenched with 1 N of HCl extracted with ethyl acetate three times The combined organic extracts are washed with a saturated sodium chloride solution dried with magnesium sulfate concentrated in vacuo Purification by silica gel chromatography (50% ethyl acetate-hexane)

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

Procedure: To a solution of 5-bromo-2-methoxy-phenol (3.5 g, 17.2 mmol) dissolved in methylene chloride (50 mL) are added triethylamine (2.08 g, 20.6 mmol) and 4-dimethylaminopyridine (0.15 g, 0.86 mmol). Then tert-butyldimethylsilyl chloride is added slowly and the reaction mixture is stirred at room temperature for 16 h. The reaction is quenched with 10% of citric acid, and then the organic layer is washed with saturated sodium bicarbonate solution, a saturated sodium chloride solution, dried with magnesium sulfate, and concentrated in vacuo. Purification by silica gel chromatography (15% ethyl acetate-hexane) provides 5.6 g (100%) of the title compound as a colorless oil. 1H NMR (CDCl3): δ 6.82 (m, 2H), 6.58 (d, J=9 Hz, 1H), 3.74 (s, 3H), 0.95 (s, 9H), 0.05 (s, 6H). The reaction is quenched with 10% of citric acid the organic layer is washed with saturated sodium bicarbonate solution a saturated sodium chloride solution, dried with magnesium sulfate concentrated in vacuo Purification by silica gel chromatography (15% ethyl acetate-hexane)

Conditions: temp:-78.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of (5-bromo-2-methoxy-phenoxy)-tert-butyl-dimethyl-silane (2 g, 6.32 mmol) dissolved in tetrahydrofuran (25 mL) at −78° C. under nitrogen is dropwisely added 1.7 M of tert-butyllithium (8.06 mL, 12.6 mmol). The reaction mixture is stirred at −78° C. for 5 minutes. Then, the solution of 2-chloro-5-formyl-benzenesulfonamide (0.462 g, 2.11 mmol) in tetrahydrofuran (5 mL) is added slowly. The reaction mixture is warmed up to room temperature and stirred for 24 h. The reaction is quenched with 1 N of HCl, and extracted with ethyl acetate three times. The combined organic extracts are washed with a saturated sodium chloride solution, dried with magnesium sulfate, and concentrated in vacuo. Purification by silica gel chromatography (50% ethyl acetate-hexane) provides 0.57 g (59%) of the title compound as a brown oil. 1H NMR (CDCl3): δ 8.00 (m, 1H), 7.40 (m, 2H), 6.70 (d, 3H), 5.70 (s, 1H), 5.00 (m, 2H), 3.70 (s, 3H), 0.90 (s, 9H), 0.05 (s, 6H). The reaction mixture is warmed up to room temperature stirred for 24 h The reaction is quenched with 1 N of HCl extracted with ethyl acetate three times The combined organic extracts are washed with a saturated sodium chloride solution dried with magnesium sulfate concentrated in vacuo Purification by silica gel chromatography (50% ethyl acetate-hexane)