1-(4-bromophenyl)-2-methylpropan-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:; See reaction.notes.procedure_details.

Procedure: A solution of 4-bromophenylmagnesium bromide in ether was treated with isobutyraldehyde to give 1-(4-bromophenyl)-2-methylpropan-1-ol, b.p. 152°-154°C./15mm. This was dehydrated with polyphosphoric acid at 20°C., to give 1-bromo-4-(2-methyl-1-propenyl)benzene, b.p. 110°-112°C./6mm, which was hydrogenated in an ether/ethanol solvent containing 50% hydrobromic acid (2% by volume of solvent) over platinum oxide to give the desired product, b.p. 120°-122°C./22mm.

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

Procedure: A solution of 4-bromophenylmagnesium bromide in ether was treated with isobutyraldehyde to give 1-(4-bromophenyl)-2-methylpropan-1-ol, b.p. 152°-154°C./15mm. This was dehydrated with polyphosphoric acid at 20°C., to give 1-bromo-4-(2-methyl-1-propenyl)benzene, b.p. 110°-112°C./6mm, which was hydrogenated in an ether/ethanol solvent containing 50% hydrobromic acid (2% by volume of solvent) over platinum oxide to give the desired product, b.p. 120°-122°C./22mm.

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

Procedure: To a solution of 9.0 g (0.048 mol) of 4-Bromobenzaldehyde in 150 mL of ether at 0° C. under argon, 2.0 M solution of isopropyl magnesium chloride in ether (29.2 mL) was added and stirred for 30 minutes. The solution was slowly warmed up to room temperature and stirred for an additional 4 hours. The mixture was then added to 150 mL of aqueous saturated sodium bicarbonate and extracted with 200 mL of ether. The organic extract was washed once with water, dried and evaporated to afford 9.8 g (95%) of the product as a gum. stirred for an additional 4 hours extracted with 200 mL of ether The organic extract was washed once with water dried evaporated

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

Procedure: To a solution of 9.0 g (0.048 mol) of 4-Bromobenzaldehyde in 150 mL of ether at 0° C. under argon, 2.0 M solution of isopropyl magnesium chloride in ether (29.2 mL) was added and stirred for 30 minutes. The solution was slowly warmed up to room temperature and stirred for an additional 4 hours. The mixture was then added to 150 mL of aqueous saturated sodium bicarbonate and extracted with 200 mL of ether. The organic extract was washed once with water, dried and evaporated to afford 9.8 g (95%) of the product as a gum. stirred for an additional 4 hours extracted with 200 mL of ether The organic extract was washed once with water dried evaporated

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

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

Procedure: To a flame-dried flask containing a near-solution of 324 mg of 4-hydroxycoumarin and 573 mg of 1-(4-bromophenyl)-2-methylpropan-1-ol of Preparation 14 in 10 mL of dioxane under an argon atmosphere is added 1.2 mL of boron trifluoride etherate. The resulting yellow solution is left to stir at room temperature overnight. The volatiles are removed and the residue is partioned between diethyl ether and 1N sodium hydroxide. The basic aqueous phase is washed with diethyl ether and acidified to pH=1 with 6N hydrochloric acid. The resulting precipitant is repeatedly extracted with dichloromethane (methanol-chloroform co-solvents). The combined dichloromethane extracts are washed once with dilute sodium bicarbonate to remove most of the unreacted 4-hydroxycoumarin, then brine, dried (magnesium sulfate), and finally concentrated under reduced pressure. The residue is adsorbed onto silica and flash column chromatographed with 50% to 60% ethyl acetate in hexanes to yield 28 mg of the title product as a tan solid. To a flame-dried flask containing The resulting yellow solution is left The volatiles are removed The basic aqueous phase is washed with diethyl ether The resulting precipitant is repeatedly extracted with dichloromethane (methanol-chloroform co-solvents) The combined dichloromethane extracts are washed once with dilute sodium bicarbonate to remove most of the unreacted 4-hydroxycoumarin brine, dried (magnesium sulfate) finally concentrated under reduced pressure chromatographed with 50% to 60% ethyl acetate in hexanes

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

Procedure: To a flame-dried flask containing a near-solution of 324 mg of 4-hydroxycoumarin and 573 mg of 1-(4-bromophenyl)-2-methylpropan-1-ol of Preparation 14 in 10 mL of dioxane under an argon atmosphere is added 1.2 mL of boron trifluoride etherate. The resulting yellow solution is left to stir at room temperature overnight. The volatiles are removed and the residue is partioned between diethyl ether and 1N sodium hydroxide. The basic aqueous phase is washed with diethyl ether and acidified to pH=1 with 6N hydrochloric acid. The resulting precipitant is repeatedly extracted with dichloromethane (methanol-chloroform co-solvents). The combined dichloromethane extracts are washed once with dilute sodium bicarbonate to remove most of the unreacted 4-hydroxycoumarin, then brine, dried (magnesium sulfate), and finally concentrated under reduced pressure. The residue is adsorbed onto silica and flash column chromatographed with 50% to 60% ethyl acetate in hexanes to yield 28 mg of the title product as a tan solid. To a flame-dried flask containing The resulting yellow solution is left The volatiles are removed The basic aqueous phase is washed with diethyl ether The resulting precipitant is repeatedly extracted with dichloromethane (methanol-chloroform co-solvents) The combined dichloromethane extracts are washed once with dilute sodium bicarbonate to remove most of the unreacted 4-hydroxycoumarin brine, dried (magnesium sulfate) finally concentrated under reduced pressure chromatographed with 50% to 60% ethyl acetate in hexanes

Conditions: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a flame-dried flask under an argon atmosphere is added 1.85 g of commercially available 4-bromobenzaldehyde and charged with 30 mL of tetrahydrofuran. The solution is cooled to 0 ° C. and slowly treated with 7.0 mL of isopropylmagnesium bromide. After stirring overnight at room temperature the reaction mixture is concentrated under reduced pressure. The residue is partioned between diethyl ether and saturated ammonium chloride; the aqueous layer is then extracted with diethyl ether. The combined organic phases are dried (magnesium sulfate), and the volatiles are removed. The residue is flash column chromatographed using 30% to 60% diethyl ether in hexane to afford 1.25 g of the title product as a viscous, tan oil. is concentrated under reduced pressure the aqueous layer is then extracted with diethyl ether The combined organic phases are dried (magnesium sulfate) the volatiles are removed chromatographed

Conditions: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a flame-dried flask under an argon atmosphere is added 1.85 g of commercially available 4-bromobenzaldehyde and charged with 30 mL of tetrahydrofuran. The solution is cooled to 0 ° C. and slowly treated with 7.0 mL of isopropylmagnesium bromide. After stirring overnight at room temperature the reaction mixture is concentrated under reduced pressure. The residue is partioned between diethyl ether and saturated ammonium chloride; the aqueous layer is then extracted with diethyl ether. The combined organic phases are dried (magnesium sulfate), and the volatiles are removed. The residue is flash column chromatographed using 30% to 60% diethyl ether in hexane to afford 1.25 g of the title product as a viscous, tan oil. is concentrated under reduced pressure the aqueous layer is then extracted with diethyl ether The combined organic phases are dried (magnesium sulfate) the volatiles are removed chromatographed

Conditions: temp:20.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Azodicarboxylic acid diisopropyl ester (824 mg, 4.1 mmol) was added to the mixture of 1-(4-bromophenyl)-2-methylpropan-1-ol (620 mg, 2.7 mmol), phenol (307 mg, 3.2 mmol), triphenylphosphine (1.07 g, 4.1 mmol) and tetrahydrofuran (15 mL) at 20° C. Then the mixture was stirred at 20° C. for 12 hours. The resultant mixture was washed with water (20 mL×2). The organic phase was separated, dried over sodium sulfate, filtered and concentrated to give a residue. The residue was purified by column chromatography (silica gel, petroleum ether/ethyl acetate=10:1) to gave 1-bromo-4-(2-methyl-1-phenoxypropyl)benzene as a colorless oil (353 g, 44%). 1H NMR (300 MHz, CDCl3): δ 8.07-7.98 (m, 2H), 7.56-7.48 (m, 2H), 7.32-7.28 (m, 2H), 6.84-6.77 (m, 3H), 4.49 (d, J=6.6 Hz, 1H), 2.35-2.30 (m, 1H), 1.01 (d, J=6.6 Hz, 6H). The resultant mixture was washed with water (20 mL×2) The organic phase was separated dried over sodium sulfate filtered concentrated to give a residue The residue was purified by column chromatography (silica gel, petroleum ether/ethyl acetate=10:1)