Structure of 1259396-11-6
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CAS No. : | 1259396-11-6 |
Formula : | C7H7BrO2S |
M.W : | 235.10 |
SMILES Code : | O=C(C1=C(C)SC(Br)=C1)OC |
MDL No. : | MFCD14636529 |
InChI Key : | KOLUIHOYXGOSFO-UHFFFAOYSA-N |
Pubchem ID : | 57839448 |
GHS Pictogram: |
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Signal Word: | Warning |
Hazard Statements: | H302-H315-H319-H335 |
Precautionary Statements: | P261-P280-P301+P312-P302+P352-P305+P351+P338 |
* All experimental methods are cited from the reference, please refer to the original source for details. We do not guarantee the accuracy of the content in the reference.
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
96% | With N-Bromosuccinimide; In N,N-dimethyl-formamide; at 20℃; | To a solution of 10 (156g, 999mmol) in DMF (750mL), NBS (178g, 1.00mol) was added at room temperature and stirred overnight. The reaction mixture was diluted with water and extracted with n-hexane. The organic layer was washed with saturated aqueous NaHCO3 and brine and dried over Na2SO4. After filtration, the solvent was concentrated under reduced pressure to give 226g (96%) of 11 as a yellow oil: 1H NMR (400MHz, CDCl3) delta 7.33 (s, 1H), 3.83 (s, 3H), 2.67 (s, 3H). |
93% | With N-Bromosuccinimide; acetic acid; In N,N-dimethyl-formamide; at 20℃; for 16h; | A mixture of methyl 2-methylthiophene-3-carboxylate (23.3 g, 0.15 mmol), N-bromosuccinimide (31.8 g, 0.18 mmol) in acetic acid (8.94 g, 0.15 mmol) and dimethylformamide (250 mL) was stirred at room temperature for 16 hours. The mixture was filtered through a pad of silica gel (petroleum ether) to afford the desired product (35 g, 93% yield). |
70% | With N-Bromosuccinimide; acetic acid; at 20℃; for 18h; | Methyl 2-methylthiophene-3-carboxylate (4.62 g, 29.6 mmol) was dissolved in DMF (23 mL) and AcOH (15 mL). N-Bromosuccinimide (5.54 g, 29.6 mmol) was added and the reaction was stirred at RT for 18 h. The mixture was evaporated to dryness then dissolved in EA and washed with sat. aq. NaHCO3 to give methyl 5-bromo-2-methylthiophene-3-carboxylate (4.90 g, 70%) as an orange oil. MS (M+1) 236.1. |
70% | With N-Bromosuccinimide; In acetic acid; N,N-dimethyl-formamide; at 0 - 25℃; for 15h; | The compound 2-methylthiophene-3-carboxylic acid methyl ester (10.0 g, 64.0 mmol) was dissolved in a mixed solution of N,N-dimethylformamide (50 mL) and acetic acid (50 mL).N-bromosuccinimide (11.4 g, 64.0 mmol) was slowly added at 0 C, and the reaction was carried out at 25 C for 15 hours.After the reaction was completed, the reaction liquid was concentrated, and 1 L of ethyl acetate was added, and the mixture was washed three times with a saturated aqueous sodium chloride solution (1 L×3).The organic phase was dried and concentrated and the residue was purified by medium-pressure preparative column chromatography (0-80% methanol, gradient) to give the title compound 10.5g,The yield was 70.0%. |
With N-Bromosuccinimide; In N,N-dimethyl-formamide; at 20℃; | 2-Methylthiophene-3-carboxylic acid methyl ester (156 g) was dissolved in N,N-dimethylformamide (750 mL), N-bromosuccinimide (178 g) was added thereto, and stirring was conducted overnight at room temperature. Water was added to the reaction liquid, and extraction was conducted by using hexane. The organic phase was washed sequentially with an aqueous sodium hydrogen sulfate solution and saturated brine and dried over anhydrous sodium sulfate. Filtration was conducted, and the filtrate was then concentrated under a reduced pressure to give the title compound (226 g).1H-NMR (CDCl3) delta (ppm): 2.67 (3H, s), 3.84 (3H, s), 7.33 (1H, s). | |
16.1 g | With N-Bromosuccinimide; acetic acid; In N,N-dimethyl-formamide; | 3 (12.00 g, 76.82 mmol) was dissolved in 100 ml DMF/aceticacid (3:2). N-bromosuccinimide (13.70 g, 77.00 mmol) was added at room temperature andstirred overnight. Thereaction mixture was diluted with H2O(30 ml) and extractedwith ethyl acetate (60 ml ×2). The organic phase waswashed with saturated aqueous sodium bisulfate solution (30 ml) and saturated brine solution (30 ml), dried over Na2SO4,and filtrated, then the solvent was evaporated under reduced pressure to give 4(16.10 g, 789.1%) as a pale yellow viscous oil. 1H NMR (400 MHz, CDCl3)delta 7.33 (s, 1H), 3.84 (s, 3H), 2.67 (s, 3H). MS (EI) m/z: 235 (M+). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
Under an argon atmosphere, <strong>[1259396-11-6]5-bromo-2-methylthiophene-3-carboxylic acid methyl ester</strong> (2.00 g) was dissolved in tetrahydrofuran (9.47 mL), isopropylmagnesium bromide (12.9 mL) was added dropwise thereto at -40 C., and stirring was conducted for 1.5 hours. A solution of 2-oxopyrrolidine-1-carboxylic acid t-butyl ester (1.89 g) in tetrahydrofuran (11.2 mL) was added dropwise at -40 C., and stirred at room temperature for 24 hours. The reaction liquid was cooled to -10 C., methanol (17.2 mL) was added thereto, sodium borohydrate (486 mg) was then added thereto in portions, and stirring was conducted for 15 minutes. A saturated aqueous ammonium chloride solution was added to the reaction liquid, and the reaction liquid was extracted with chloroform and dried over anhydrous sodium sulfate. Filtration was conducted, the filtrate was then concentrated under a reduced pressure, and the obtained residue was purified by silica gel chromatography (hexane/ethyl acetate=1/1) to give the title compound (2.13 g) as a yellow oily substance.1H-NMR (CDCl3) delta (ppm): 1.44 (9H, s), 1.51-1.69 (4H, m), 1.79-1.84 (1H, m), 2.70 (3H, s), 3.15-3.19 (1H, m), 3.83 (3H, s), 4.57-4.87 (1H, m), 7.26 (1H, s). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
Under an argon atmosphere, <strong>[1259396-11-6]5-bromo-2-methylthiophene-3-carboxylic acid methyl ester</strong> (227 g) was dissolved in tetrahydrofuran (350 mL) and cooled to 0 C. Isopropylmagnesium bromide (1500 mL) was added dropwise thereto at 10 C. or less, and stirring was conducted at 0 C. for 2 hours.A solution of (S)-4-(t-butyldimethylsilanyloxy)-2-oxopyrrolidine-1-carboxylic acid t-butyl ester (276 g) in tetrahydrofuran (550 mL) was then added dropwise thereto at 10 C. or less, and stirring was conducted at room temperature for 1.5 hours. The reaction liquid was cooled to 0 C., a 30% aqueous citric acid solution was added dropwise thereto at 10 C. or less to adjust the pH 3, and stirring was conducted at room temperature for 1.5 hours. Ethyl acetate was added to the reaction liquid, and the organic phase was washed sequentially by a 5% aqueous sodium hydrogen carbonate solution and saturated brine and dried over anhydrous sodium sulfate. Filtration was conducted, and the filtrate was then concentrated under a reduced pressure to give a crude product (418 g).Under an argon atmosphere, (R)-5,5-diphenyl-2-methyl-3,4-propano-1,3,2-oxazborolidine (49.1 g) was dissolved in tetrahydrofuran (86 mL), a boran-dimethylsulfide complex (886 mL) was added dropwise thereto at room temperature, and stirring was conducted for 20 minutes. A solution of the above-mentioned crude product (418 g) in tetrahydrofuran (450 mL) was then added dropwise thereto at room temperature over 45 minutes, and stirring was conducted for 30 minutes. The reaction liquid was cooled to 0 C., methanol/saturated brine was added dropwise thereto, ethyl acetate was then added thereto, and the organic phase was washed with saturated brine and dried over anhydrous sodium sulfate. Filtration was conducted, the obtained filtrate was then concentrated under a reduced pressure, and the obtained residue was passed through a short column of a silica gel (ethyl acetate/hexane=1/2) to give a crude product (337 g).Under an argon atmosphere, the above-mentioned crude product (302 g) and triethylamine (265 mL) were dissolved in methylene chloride (800 mL), a solution of methanesulfonyl chloride (73.8 mL) in methylene chloride (295 mL) was added dropwise thereto at 0 C., and stirring was conducted for 30 minutes. Water was added to the reaction liquid, extraction was conducted by using methylene chloride, and the organic phase was dried over anhydrous sodium sulfate. Filtration was conducted, and the filtrate was then concentrated under a reduced pressure to give a crude product (304 g).The above-mentioned crude product (265 g) was dissolved in tetrahydrofuran (265 mL), tetrabutylammonium fluoride (565 mL) was added dropwise thereto at room temperature, and stirring was conducted continuously for 1.5 hours. The reaction liquid was concentrated under a reduced pressure, extracted with ethyl acetate, washed sequentially with water and saturated brine and dried over anhydrous sodium sulfate. Filtration was conducted, the filtrate was then concentrated under a reduced pressure, and the obtained residue was purified by silica gel column chromatography (ethyl acetate/hexane=1/5-2/1) to give the title compound (128 g) as a yellow white solid.1H-NMR (CDCl3) delta (ppm): 1.24-1.45 (9H, m), 1.66 (1H, t, J=4.9 Hz), 2.18 (1H, d, J=14.3 Hz), 2.35-2.51 (1H, m), 2.71 (3H, s), 3.51 (1H, d, J=11.7 Hz), 3.66 (1H, t, J=7.7 Hz), 3.83 (3H, s), 4.48-4.58 (1H, m), 5.09 (1H, b r.s), 7.16-7.21 (1H, m).ESI/MS (m/z): 342 (M+H)+, 340 (M-H)-. |
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