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CAS No. : | 27246-81-7 | MDL No. : | MFCD00012933 |
Formula : | C6H8BrClN2 | Boiling Point : | No data available |
Linear Structure Formula : | - | InChI Key : | RPYIPFXHIKXRKS-UHFFFAOYSA-N |
M.W : | 223.50 | Pubchem ID : | 33757 |
Synonyms : |
|
Signal Word: | Warning | Class: | |
Precautionary Statements: | P261-P301+P312-P302+P352-P304+P340-P305+P351+P338 | UN#: | |
Hazard Statements: | H302-H315-H319-H335 | Packing Group: | |
GHS Pictogram: |
* 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 |
---|---|---|
74% | In acetic acid; for 16h;Heating / reflux; | A solution of 3-BROMOPHENYLHYDRAZINE hydrochloride (0.5 g, 2.2 mmol) and ethyl 5,5- dimethyl-2, 4-DIOXOHEXANOATE (0. 54 g, 2. 68 mmol) in acetic acid (10 ML) was refluxed for 16 hours. The reaction was cooled to room temperature, and the solvent was removed under reduced pressure. The residue was partitioned between ethyl acetate and water. The organic layer was washed with water, saturated bicarbonate and brine, and dried over sodium sulfate, filtered and concentrated. The crude material was purified by column chromatography (4. 8 : 0.2 HEXANES/ETHYL acetate) to give ethyl 1- (3- BROMOPHENYL)-5-TERT-BUTYL-LH-PYRAZOLE-3-CARBOXYLATE (0.59 g, 74 %) as a syrup. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With sodium hydroxide; PPA; In 5,5-dimethyl-1,3-cyclohexadiene; hexane; dichloromethane; acetone; | PREPARATION 9 4-Bromo-2-methyl-1H-indole and 6-bromo-2-methyl-1H-indole 3-Bromophenylhydrazine hydrochloride (26.5 g) was partitioned between etherand excess 2N sodium hydroxide solution. The ether layer was separated, washed with brine, dried (MgSO4) and evaporated. The residue was redissolved in ether (25 ml) and the solution was cooled in ice. Acetone (25 ml) was added and the mixture was allowed to stand for 20 minutes and then evaporated. The residue was dissolved in acetone (25 ml), the solution was evaporated and the residue azeotroped with xylene. The residue was dissolved in xylene (30 ml) and the solution was added dropwise to stirred polyphosphoric acid (200 g) at 90 C. The mixture was stirred at 100 C. for 4 hours and then cooled and poured into ice water with stirring. The mixture was extracted twice with ether, and the combined extracts were washed with brine and dried (MgSO4). The solvent was evaporated and the residue was chromatographed on silica gel using dichloromethane/hexane (1:4) as eluent. The product fractions were combined and evaporated, and the residue was crystallized twice from hexane to give 6-bromo-2-methyl-1H-indole (8.70 g), m.p. 132-134 C. delta(CDCl3): 2.38(3H,s), 6.15(1H,s), 7.12(1H,dd), 7.32(1H,d), 7.36(1H,d), 7.77(1H,br). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
60% | Oxalyl chloride (1.20 mL, 14.2 mmol) was added dropwise to a stirred solution of <strong>[89489-53-2]tetrahydro-2H-thiopyran-4-carboxylic acid</strong> (, 2.00 g, 13.7 mmol) in dichloromethane (25 mL). Then, two drops of N,N'-dimethylformamide were added and stirring was continued. After 1.5 hours, the resultant solution was added dropwise over 30 minutes to a stirred, cooled (ice-bath) solution of (3-bromophenyl)hydrazine hydrochloride (3.05 g, 13.7 mmol) and triethylamine (4.20 mL, 30.1 mmol) in dichloromethane (40 mL). After the addition, the mixture was warmed to room temperature and stirred for two hours. The mixture was then concentrated in vacuo and the residue was partitioned between ethyl acetate and water. The organic layer was washed with 4% aqueous sodium hydrogen carbonate solution, dried (MgSO4) and evaporated. The residue was triturated with diethyl ether and the solid was filtered and dried to give the title compound (2.57 g, 60%) as an off-white solid. LRMS (m/z): 315/317 (M+1)+. 1H-NMR δ (DMSO-d6): 1.62-1.76 (m, 2H), 2.00-2.07 (m, 2H), 2.28-2.37 (m, 1 H), 2.63-2.67 (m, 4H), 6.66 (d, J=9.0 Hz, 1 H), 6.79 (t, J=3.0Hz, 1 H), 6.84 (d, J=9.0 Hz, 1H), 7.08 (t, J=9.0 Hz, 1H), 8.00 (brs, 1H), 9.71 (brs, 1H). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
To a solution of the mixture of regioisomers from Step A above (1.1 g, 4.4 mmol) in xylene (20 mL) was added manganese(IV)-oxide (3.80 g, 40 mmol). The mixture was stirred at 110 C (internal temperature) overnight. The solid material (Mn02) was filtered off through a paper filter, and the solvents were removed under reduced pressure. The residue was purified on HP-Sil cartridges, by employing a dichloromethane/methanol gradient (100/0 -> 90/10) to obtain a mixture of regioisomers (0.47 g, 43%) (0148) MS (ESI): m/z = 247.19/249.18 [M+H]+ |
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