2-tert-butylfuran

反応条件: temp:0.00; pressure:0.00; stir:

反応条件: temp:0.00; pressure:0.00; stir:

反応条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: oxocane; 2,3-epoxybutane; 1,2-epoxybut-3-ene; styrene oxide; 2-ethylfuran; 2-tert-butylfuran; 2,3-dimethylfuran; 2,3-dihydrobenzofuran; dimethyl 3-furylmethyl borate; 2-trimethylsilylfuran; 3-trimethylsilylfuran; oxazole; 1,3,4-oxadiazole; 3,4-dichloro-1,2-epoxybutane; 3,4-dibromo-1,2-epoxybutane and the like.

反応条件: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: n-Butyllithium (25 mL, 40 mmol, 1.6 M in hexane solution, 1.1 equiv) is added dropwise to a solution of 4.5 g of 2-t-butylfuran (36 mmol) in 60 mL of dry THF at −78° C. under N2. After 30 min, the cooling bath is replaced with an ice bath and the mixture stirred at 0° C. for 1 h. Dry CO2, generated from dry ice and dried over an anhydrous Na2SO4 tower, is bubbled into the reaction mixture over 20 min at −78° C. and then at 0° C. The reaction mixture is acidified with 1 M HCl to pH 1, then extracted with ethyl acetate. The organic layer is washed with brine, dried (NaSO4) and concentrated to give 4.2 g of 2-tertbutyl 5-furanoic acid as a pale yellow solid (69%). 1H NMR (CDCl3) d 11.0 (br s, 1H), 7.19 (d, 1H, J=3.3 Hz), 6.11 (d 1H, J=3.3 Hz), 1.29 (s, 9H). the cooling bath is replaced with an ice bath dried over an anhydrous Na2SO4 tower is bubbled into the reaction mixture over 20 min at −78° C. at 0° C extracted with ethyl acetate The organic layer is washed with brine dried (NaSO4) concentrated

反応条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: oxocane; 2,3-epoxybutane; 1,2-epoxybut-3-ene; styrene oxide; 2-ethylfuran; 2-tert-butylfuran; 2,3-dimethylfuran; 2,3-dihydrobenzofuran; dimethyl 3-furylmethyl borate; 2-trimethylsilylfuran; 3-trimethylsilylfuran; oxazole; 1,3,4-oxadiazole; 3,4-dichloro-1,2-epoxybutane; 3,4-dibromo-1,2-epoxybutane and the like.

反応条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: oxocane; 2,3-epoxybutane; 1,2-epoxybut-3-ene; styrene oxide; 2-ethylfuran; 2-tert-butylfuran; 2,3-dimethylfuran; 2,3-dihydrobenzofuran; dimethyl 3-furylmethyl borate; 2-trimethylsilylfuran; 3-trimethylsilylfuran; oxazole; 1,3,4-oxadiazole; 3,4-dichloro-1,2-epoxybutane; 3,4-dibromo-1,2-epoxybutane and the like.

反応条件: temp:0.00; pressure:0.00; stir:

反応条件: temp:0.00; pressure:0.00; stir:

反応条件: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: n-Butyllithium (25 mL, 40 mmol, 1.6 M in hexane solution, 1.1 equiv) is added dropwise to a solution of 4.5 g of 2-t-butylfuran (36 mmol) in 60 mL of dry THF at −78° C. under N2. After 30 min, the cooling bath is replaced with an ice bath and the mixture stirred at 0° C. for 1 h. Dry CO2, generated from dry ice and dried over an anhydrous Na2SO4 tower, is bubbled into the reaction mixture over 20 min at −78° C. and then at 0° C. The reaction mixture is acidified with 1 M HCl to pH 1, then extracted with ethyl acetate. The organic layer is washed with brine, dried (NaSO4) and concentrated to give 4.2 g of 2-tertbutyl 5-furanoic acid as a pale yellow solid (69%). 1H NMR (CDCl3) d 11.0 (br s, 1H), 7.19 (d, 1H, J=3.3 Hz), 6.11 (d 1H, J=3.3 Hz), 1.29 (s, 9H). the cooling bath is replaced with an ice bath dried over an anhydrous Na2SO4 tower is bubbled into the reaction mixture over 20 min at −78° C. at 0° C extracted with ethyl acetate The organic layer is washed with brine dried (NaSO4) concentrated

反応条件: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: To a solution of 2-tert-butylfuran (4.5 g, 36 mmol) in anh. THF (60 mL) at −78° C. under N2 was added n-butyllithium (1.6M in hexane, 25 mL, 40 mmol, 1.1 equiv) dropwise. After 30 min, the cooling bath was replaced with an ice bath and the mixture was stirred at 0° C. for 1 h. Dry CO2, generated from dry ice and dried over an anhydrous Na2SO4 tower, was bubbled into the reaction mixture over 20 min at −78° C. and then at 0° C. The reaction mixture was acidified to pH 1 with a 1M HCl solution, then extracted with EtOAc. The organic layer was washed with a concentrated NaCl solution, dried (NaSO4) and concentrated under reduced pressure to give 5-tert-butylfuran-2-carboxylic acid as a pale yellow solid (4.2 g, 69%): 1H NMR (CDCl3) δ1.29 (s, 9H), 6.11 (d 1H, J=3.3 Hz), 7.19 (d, 1H, J=3.3 Hz), 11.0 (br s, 1H). the cooling bath was replaced with an ice bath dried over an anhydrous Na2SO4 tower was bubbled into the reaction mixture over 20 min at −78° C. at 0° C extracted with EtOAc The organic layer was washed with a concentrated NaCl solution dried (NaSO4) concentrated under reduced pressure

反応条件: temp:10.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: Phosphorus oxychloride (26.75 g, 0.174 mol) was added dropwise to dimethylformamide (12.92 g, 0.177 mol). This mixture was cooled to 10° C. for 1/2 hour, then 2-t-butylfuran (18.45 g, 0.149 mol) was added dropwise and the mixture stirred at room temperature for 3 hours. The mixture was poured into ice/water, neutralised with sodium carbonate and extracted into diethyl ether. The ethereal extracts were washed with water, dried over anhydrous sodium sulphate and the solvent removed to give a brown oil. Purification by column chromatography (silica eluted with petroleum ether/ethyl acetate 9:1) gave 5-t-butyl-2-furancarboxaldehyde (22.46 g, 99%). extracted into diethyl ether The ethereal extracts were washed with water dried over anhydrous sodium sulphate the solvent removed to give a brown oil Purification by column chromatography (silica eluted with petroleum ether/ethyl acetate 9:1)

反応条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: oxocane; 2,3-epoxybutane; 1,2-epoxybut-3-ene; styrene oxide; 2-ethylfuran; 2-tert-butylfuran; 2,3-dimethylfuran; 2,3-dihydrobenzofuran; dimethyl 3-furylmethyl borate; 2-trimethylsilylfuran; 3-trimethylsilylfuran; oxazole; 1,3,4-oxadiazole; 3,4-dichloro-1,2-epoxybutane; 3,4-dibromo-1,2-epoxybutane and the like.