cyclobutanecarbaldehyde

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:

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

実験手順: Ethyl 2-triphenylphosphoranylideneacetate (9.32 g, 26.74 mmol) was added to a solution of cyclobutanecarbaldehyde, 45a, (1.50 g, 17.83 mmol) in dichloromethane (30 mL). The reaction mixture was briefly purged with nitrogen and capped allowed to stir at room temperature overnight. All volatiles were removed at reduced pressure and the residue was dissolved in Et2O (100 mL) and hexanes (25 mL). The resulting pink precipitate was filtered off and discarded. The solvent was removed from the filtrate at reduced pressure. The crude product was purified via silica gel chromatography (0-20% EtOAc/Hexanes gradient) to afford 646 mg (23%) of the desired product: 1H NMR (400 MHz, CDCl3) δ 7.05 (dd, J=15.6, 6.8 Hz, 1H), 5.73 (dd, J=15.6, 1.4 Hz, 1H), 4.29-4.09 (m, 2H), 3.20-2.98 (m, 1H), 2.28-2.09 (m, 2H), 2.04-1.78 (m, 4H), 1.36-1.18 (m, 3H). The reaction mixture was briefly purged with nitrogen capped All volatiles were removed at reduced pressure the residue was dissolved in Et2O (100 mL) The resulting pink precipitate was filtered off The solvent was removed from the filtrate at reduced pressure The crude product was purified via silica gel chromatography (0-20% EtOAc/Hexanes gradient)

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

実験手順: To a solution of cyclobutanecarbaldehyde (1.0 g, 11.89 mmol, 1.00 equiv) in CH2Cl2 (10 mL) were added pyridinium p-toluenesulfonate (0.143 g, 0.57 mmol, 0.05 equiv), (S)-(−)-2-methylpropane-2-sulfinamide (1.22 g, 10.07 mmol, 0.85 equiv), and magnesium sulfate (7.14 g, 59.32 mmol, 5.00 equiv). The resulting mixture was stirred overnight at room temperature. The reaction mixture was filtered and concentrated under reduced pressure. The resulting residue was purified by flash chromatography (silica gel, 30% EtOAc in petroleum ether) to provide 2.0 g (90%) of the title compound as a white solid. 1H NMR (400 MHz, CDCl3) δ ppm 8.08 (d, J=10.8 Hz, 1H), 3.36-3.32 (m, 1H), 2.25-2.16 (m, 4H), 2.03-1.90 (m, 2H), 1.15 (s, 9H). The reaction mixture was filtered concentrated under reduced pressure The resulting residue was purified by flash chromatography (silica gel, 30% EtOAc in petroleum ether)

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

実験手順: In 1,2-dichloroethane (7 ml) were dissolved methyl 7-[4-(2-butoxyethoxy)phenyl]-2,3-dihydro-1H-1-benzazepine-4-carboxylate (0.4 g) and cyclobutanecarboaldehyde (0.5 g). To the solution was added sodium triacetoxyborohydride (0.43 g), and the mixture was stirred under nitrogen atmosphere at room temperature for 4 hours, poured into water, neutralized with sodium hydrogen carbonate solution and extracted with ethyl acetate. The organic layer was washed with water and saturated brine and dried with anhydrous magnesium sulfate. The solvent was evaporated to give methyl 7-[4-(2-butoxyethoxy)phenyl]-1-cyclobutylmethyl-2,3-dihydro-1H-1-benzazepine-4-carboxylate (0.47 g) as yellow oil. extracted with ethyl acetate The organic layer was washed with water and saturated brine dried with anhydrous magnesium sulfate The solvent was evaporated

反応条件: temp:-40.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: To a solution of ethyl 4-iodobenzoate (1.45 mL, 8.69 mmol) in anhydrous tetrahydrofuran (14.5 mL) at −40° C. was added isopropyl magnesium chloride lithium chloride complex (8.0 mL, 10.4 mmol) dropwise. The resulting brown solution was stirred for 40 min at −40° C. The crude cyclobutanecarbaldehyde (1.8 g, approximately 10.5 mmol pure) was added and the reaction was warmed to room temperature and stirred for 18 h. The reaction is then quenched with 1 N hydrochloric acid and extracted three times with ethyl acetate. The combined organic layers were dried over sodium sulfate, filtered, and concentrated to give 2.0 g of crude material. Purification by silica gel flash chromatography (0-20% ethyl acetate in heptane) afforded ethyl 4-(cyclobutyl(hydroxy)methyl)benzoate (1.05 g) as an oil. 1H NMR (400 MHz, CDCl3) δ 8.01 (d, J=8.4 Hz, 2H), 7.39 (d, J=8.2 Hz, 2H), 4.64 (d, J=7.6 Hz, 1H), 4.47-4.25 (m, 2H), 2.73-2.47 (m, 1H), 2.13-1.94 (m, 2H), 1.95-1.70 (m, 4H), 1.55 (br. s., 1H), 1.38 (t, J=7.0 Hz, 3H). the reaction was warmed to room temperature stirred for 18 h The reaction is then quenched with 1 N hydrochloric acid extracted three times with ethyl acetate The combined organic layers were dried over sodium sulfate filtered concentrated to give 2.0 g of crude material Purification by silica gel flash chromatography (0-20% ethyl acetate in heptane)

反応条件: temp:-40.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: To a solution of ethyl 4-iodobenzoate (1.45 mL, 8.69 mmol) in anhydrous tetrahydrofuran (14.5 mL) at −40° C. was added isopropyl magnesium chloride lithium chloride complex (8.0 mL, 10.4 mmol) dropwise. The resulting brown solution was stirred for 40 min at −40° C. The crude cyclobutanecarbaldehyde (1.8 g, approximately 10.5 mmol pure) was added and the reaction was warmed to room temperature and stirred for 18 h. The reaction is then quenched with 1 N hydrochloric acid and extracted three times with ethyl acetate. The combined organic layers were dried over sodium sulfate, filtered, and concentrated to give 2.0 g of crude material. Purification by silica gel flash chromatography (0-20% ethyl acetate in heptane) afforded ethyl 4-(cyclobutyl(hydroxy)methyl)benzoate (1.05 g) as an oil. 1H NMR (400 MHz, CDCl3) δ 8.01 (d, J=8.4 Hz, 2H), 7.39 (d, J=8.2 Hz, 2H), 4.64 (d, J=7.6 Hz, 1H), 4.47-4.25 (m, 2H), 2.73-2.47 (m, 1H), 2.13-1.94 (m, 2H), 1.95-1.70 (m, 4H), 1.55 (br. s., 1H), 1.38 (t, J=7.0 Hz, 3H). the reaction was warmed to room temperature stirred for 18 h The reaction is then quenched with 1 N hydrochloric acid extracted three times with ethyl acetate The combined organic layers were dried over sodium sulfate filtered concentrated to give 2.0 g of crude material Purification by silica gel flash chromatography (0-20% ethyl acetate in heptane)

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

実験手順: The title compound was prepared by a method analogous to that described for Intermediate (16), using ethyl 4-iodobenzoate and cyclobutanecarbaldehyde. 1H NMR (400 MHz, CDCl3, δ): 7.93 (d, J=8.0 Hz, 2H), 7.31 (d, J=8.0 Hz, 2H), 4.58 (d, J=8.0 Hz, 1H), 4.29 (q, J=6.8 Hz, 2H), 2.50-2.58 (m, 1H), 1.70-2.02 (m, 6H), 1.34 (t, J=7.2 Hz, 3H).

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

実験手順: A solution of methyl 5-oxo-5,6,7,8-tetrahydronaphthalene-2-carboxylate (600 mg, 2.9 mmol) in tetrahydrofuran (10 mL) was cooled to ice bath temperature and treated with 1.0 M lithium hexamethyldisilazide in tetrahydrofuran (5 mL). After stirring for twenty minutes, cyclobutanecarboxaldehyde (J. Med. Chem. 1989, 32, 1001-6) (24 mL of 0.5 M solution in tetrahydrofuran) was slowly added and the mixture allowed to warm to room temperature and stir for 3 days. The mixture was poured into water, extracted three times with ethyl acetate, washed with brine, dried over magnesium sulfate, filtered and concentrated. The crude product was purified by normal phase flash column chromatography on a 50 g silica gel column (5-50% ethyl acetate/hexanes gradient). Pure fractions were pooled and concentrated in vacuo to yield methyl 6-(cyclobutylmethylene)-5-oxo-5,6,7,8-tetrahydronaphthalene-2-carboxylate (300 mg, 1.1 mmol, 38% yield). 1H NMR (400 MHz, DMSO-d6) δ ppm 1.81-2.03 (m, 4H), 2.14-2.27 (m, 2H), 2.71 (t, J=6.58 Hz, 2H), 2.93-3.00 (m, 2H), 3.34-3.44 (m, 1H), 3.88 (s, 3H), 6.91 (d, J=9.13 Hz, 1H), 7.84-7.95 (m, 2H), 8.01 (d, J=8.06 Hz, 1H). ES-MS m/z 271 (M+H). stir for 3 days extracted three times with ethyl acetate washed with brine dried over magnesium sulfate filtered concentrated The crude product was purified by normal phase flash column chromatography on a 50 g silica gel column (5-50% ethyl acetate/hexanes gradient) concentrated in vacuo

反応条件: temp:0.00; pressure:0.00; stir:

反応条件: temp:0.00; pressure:0.00; stir: