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CAS No. : | 1912-33-0 | MDL No. : | MFCD00005636 |
Formula : | C11H11NO2 | Boiling Point : | - |
Linear Structure Formula : | - | InChI Key : | KTHADMDGDNYQRX-UHFFFAOYSA-N |
M.W : | 189.21 | Pubchem ID : | 74706 |
Synonyms : |
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Signal Word: | Warning | Class: | N/A |
Precautionary Statements: | P280-P305+P351+P338 | UN#: | N/A |
Hazard Statements: | H302 | Packing Group: | N/A |
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 |
---|---|---|
65% | With sodium hydride In N,N-dimethyl-formamide at 20℃; for 6 h; | N-Methyl-3-indoleacetic acid methyl ester 3-Indoleacetic acid methyl ester (200 mg, 1.1 mmol) was dissolved in N,N-dimethylformamide (3 mL). To the solution, sodium hydride (60 mg) was added. To this solution, methyl iodide (223 mg, 1.58 mmol) was added, and the mixture was stirred at room temperature for 6 hours. After the reaction was confirmed by TLC to be complete, the reaction solution was acidified (pH=3 to 4) by the addition of 6 N hydrochloric acid, and water (5 ml) was added thereto, followed by extraction with ethyl acetate (5 ml) three times. The organic layer was washed twice with brine and dried over anhydrous sodium sulfate. The solvent was distilled off under reduced pressure, and then, the residue was purified by silica gel column chromatography (hexane:ethyl acetate=5:1) to obtain N-methyl-3-indoleacetic acid methyl ester (140 mg, yield: 65percent); 1H NMR (400 MHz, CDCl3): δ 7.60 (d, J=7.9 Hz, 1H), 7.29 (d, J=8.2 Hz, 1H), 7.23 (dd, J=8.2, 7.9 Hz, 1H), 7.12 (dd, J=8.2, 7.9 Hz, 1H), 7.03 (s, 1H), 3.75 (s, 3H), 3.77 (s, 2H), 3.69 (s, 3H); 13C NMR (100 MHz, CDCl3): δ 172.6, 136.9, 127.7, 121.7 (2C), 119.26, 118.9, 109.3, 106.8, 51.9, 32.7, 31.0. |
19% | Stage #1: With sodium hydride In DMF (N,N-dimethyl-formamide) for 1 h; Stage #2: for 18 h; |
To a suspension of sodium hydride (104 mg, 7.61 [MMOL)] in DMF (11 mL) was added a solution of 1 H-indol-3-yl-acetic acid methyl ester (0.50 g, 2.6 [MMOL)] in DMF (5.0 mL). The mixture was stirred for 1 h followed by addition of methyl iodide (1.1 g, 7.8 [MMOL).] The reaction mixture was stirred for an additional 18 h, quenched, diluted with saturated ammonium chloride (200 mL), and then extracted with diethyl ether (3 x 100 mL). The combined organic layers were dried with [NA2SO4,] and the solvent was removed under reduced pressure. The crude residue was purified by flash chromatography (EtOAc/hexanes) giving 100 mg (19percent) of [(1-METHYL-1H-INDOL-3-YL)-ACETIC] acid methyl ester after purification. HPLC: Rt = 8.91 (Method A). MS (ES+): mass calculated for [C12H13NO2,] 203.09 ; m/z found 204.09 [[M+H] +. 1H] NMR (400 MHz, [CDCI3)] : 7.60 (d, J = 7.9 Hz, [1 H),] 7.30 (d, [J =] 8.2 Hz, 1 H), 7.23 (t, J = 8.2 Hz, 1H), 7.13 (t, 7.4 Hz, 1H), 7.04 [(S,] [1 H),] 3.77 (s, 2H), 3.76 (s, [3H),] 3.69 (s, 3H). |
19% | Stage #1: With sodium hydride In DMF (N,N-dimethyl-formamide) for 1 h; Stage #2: for 18 h; |
To a suspension of20 sodium hydride (104 mg, 7.61 mmol) in DMF (11 ml) was added a solution of1H-indol-3-yl-acetic acid methyl ester (0.50 g, 2.6 mmol) in DMF (5.0 ml). Themixture was stirred for 1 h followed by addition of methyl iodide (1.1 g, 7.8mmol). The reaction mixture was stirred for an additional 18 h, quenched,diluted with saturated ammonium chloride (200 ml), and then extracted with25 diethyl ether (3 x 100 ml). The combined organic layers were dried withNasSCU, and the solvent was removed under reduced pressure. The cruderesidue was purified by flash chromatography (EtOAc/hexanes) giving 100 mg(19percent) of (1 -methyl-1 H-indol-3-yl)-acetic acid methyl ester after purification.HPLC: Rt = 8.91 (Method A). MS (ES+): mass calculated for C12H13NO2, 203.09; m/z found 204.09 [M+Hf. 1H NMR (400 MHz, CDCI3): 7.60 (d, J= 7.9Hz, 1H), 7.30 (d, J= 8.2 Hz, 1H), 7.23 (t, J= 8.2 Hz, 1H), 7.13 (t, 7.4 Hz, 1H),7.04 (s, 1H), 3.77 (s, 2H), 3.76 (s, 3H), 3.69 (s, 3H). |
19% | With sodium hydride In DMF (N,N-dimethyl-formamide) for 19 h; | A. (1-Methyl-1H-indol-3-yl)-acetic acid methyl ester. To a suspension of sodium hydride (104 mg, 7.61 mmol) in DMF (11 mL) was added a solution of 1H-indol-3-yl-acetic acid methyl ester (0.50 g, 2.6 mmol) in DMF (5.0 mL). The mixture was stirred for 1 h followed by addition of methyl iodide (1.1 g, 7.8 mmol). The reaction mixture was stirred for an additional 18 h, quenched, diluted with saturated ammonium chloride (200 mL), and then extracted with diethyl ether (3*100 mL). The combined organic layers were dried with Na2SO4, and the solvent was removed under reduced pressure. The crude residue was purified by flash chromatography (EtOAc/hexanes) giving 100 mg (19percent) of (1-methyl-1H-indol-3-yl)-acetic acid methyl ester after purification. HPLC: Rt=8.91 (Method A). MS (ES+): mass calculated for Cl2H13NO2, 203.09; m/z found 204.09 [M+H]+. 1H NMR (400 MHz, CDCl3): 7.60 (d, J=7.9 Hz, 1H), 7.30 (d, J=8.2 Hz, 1H), 7.23 (t, J=8.2 Hz, 1H), 7.13 (t, 7.4 Hz, 1H), 7.04 (s, 1H), 3.77 (s, 2H), 3.76 (s, 3H), 3.69 (s, 3H). |
2.71 g | Stage #1: With sodium hydride In tetrahydrofuran; N,N-dimethyl-formamide at 0℃; for 1 h; Stage #2: at 0℃; for 0.25 h; |
To a suspension of NaH (ca. 60wtpercent, 728 mg, 18.21 mmol) in THF (30 mL) and DMF (15 mL) at 0 °Cwas added a solution of the crude methyl ester in THF (30 mL) dropwise. After stirring at 0 °C for 1 h,MeI (2.06 mL, 33.11 mmol) was added dropwise. The reaction mixture was stirred at 0 °C for 15 min.The reaction was quenched successively with H2O (2 mL) and sat. aq. NH4Cl (6 mL). The layers wereseparated, and the aqueous layer was extracted with AcOEt (2 x 60 mL). The organic layers werecombined, washed with brine (60 mL), dried over MgSO4, and concentrated in vacuo. The residue waspurified by flash chromatography (silica gel, hexane/AcOEt = 10:1) to afford 26 (2.71 g, 81percent yield from3-indoleacetic acid) as a colorless oil. |
1.4 g | With sodium hydride In tetrahydrofuran at 0 - 20℃; for 3 h; | To a stirred solution of 2-(1H-indol-3-yl)acetic acid (19-1) (3.0 g, 17.1 mmol) in DMF (20.0 mL ) was added K2CO3 (7.09 g, 51.3 mmol) and the reaction mixture was stirred for 15 minutes. Methyl iodide (3.19 mL, 51.3 mmol) was then added to the reaction mixture and stirring was continued at room temperature for 16 hours. TLC showed formation of a new spot (Rf-0.5 in 20percent ethyl acetate/hexane). The reaction was diluted with water and extracted with ethyl acetate. The organic layer was washed with water, brine, dried over sodium sulfate and concentrated. 1HNMR and LCMS showed only the acid group was converted to its methyl ester, N-methylation didn't took place. The residue was again dissolved in THF (15.0 mL) and to it was added NaH (1.0 eq) at 0°C. MeI (1.0 eq) was then added to the reaction mixture and the reaction mixture was stirred at room temperature for 3 hours. TLC showed a new spot formation (Rf-0.6 in 10percent ethyl acetate/hexane). The reaction was diluted with cold water and ethyl acetate. The organic layer was separated and washed with water, brine, dried over sodium sulfate, concentrated and the resulting residue was purified by column chromatography (silica 100-200, 0percent-2percent ethyl acetate/hexane) to afford methyl 2-(1-methyl-1H-indol-3-yl)acetate 19-2 (1.40 g, 6.88 mmol, 40.3 percent) as a yellow oil. LC MS: ES+ 204.3. |
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