Structure of Indole-5-carboxylic acid
CAS No.: 1670-81-1
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The BI-3802 was designed by Boehringer Ingelheim and could be obtained free of charge through the Boehringer Ingelheim open innovation portal opnMe.com, associated with its negative control.
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A tunable synthesis of indigoids: targeting indirubin through temperature
Shriver, James A. ; Kaller, Kaylie S. ; Kinsey, Ally L. ; Wang, Katelyn R. ; Sterrenberg, Summer R. ; Van Vors, Madison K. , et al.
Abstract: The spontaneous conversion of 3-indoxyl to indigo was a well-established process used to produce indigo dyes. It was recently shown that some indoles, when reacted with molybdenum hexacarbonyl and cumyl peroxide, proceed through an indoxyl intermediate to produce significant amounts of indirubin through a competing mechanism. Modulation of this system to lower temperatures allows for careful tuning, leading to selective production of indirubins in a general process. A systematic assay of indoles show that electron deficient indoles work well when substituted at the 5 and 7 positions. In contrast, 6-substituted electron rich indoles give the best results whereas halogeno indoles work well in all cases. This process shows broad functional group tolerance for generally reactive carbonyl-containing compounds such as aldehydes and carboxylic acids.
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Purchased from AmBeed: 1006-94-6 ; 3420-02-8 ; 1670-82-2 ; 10075-50-0 ; 3189-13-7 ; 933-67-5 ; 17422-33-2 ; 17422-32-1 ; 4769-96-4 ; 271-63-6 ; 6146-52-7 ; 614-96-0 ; 15861-24-2 ; 479-41-4 ; 25235-85-2 ; 1670-81-1 ; 120-72-9 ; 1074-88-0 ; 84-40-2 ; 19201-53-7 ; 482-89-3
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CAS No. : | 1670-81-1 |
Formula : | C9H7NO2 |
M.W : | 161.16 |
SMILES Code : | O=C(C1=CC2=C(NC=C2)C=C1)O |
MDL No. : | MFCD00005678 |
InChI Key : | IENZCGNHSIMFJE-UHFFFAOYSA-N |
Pubchem ID : | 74280 |
GHS Pictogram: |
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Signal Word: | Warning |
Hazard Statements: | H315-H319-H335 |
Precautionary Statements: | P261-P305+P351+P338 |
Num. heavy atoms | 12 |
Num. arom. heavy atoms | 9 |
Fraction Csp3 | 0.0 |
Num. rotatable bonds | 1 |
Num. H-bond acceptors | 2.0 |
Num. H-bond donors | 2.0 |
Molar Refractivity | 45.26 |
TPSA ? Topological Polar Surface Area: Calculated from |
53.09 Ų |
Log Po/w (iLOGP)? iLOGP: in-house physics-based method implemented from |
1.04 |
Log Po/w (XLOGP3)? XLOGP3: Atomistic and knowledge-based method calculated by |
0.91 |
Log Po/w (WLOGP)? WLOGP: Atomistic method implemented from |
1.87 |
Log Po/w (MLOGP)? MLOGP: Topological method implemented from |
1.08 |
Log Po/w (SILICOS-IT)? SILICOS-IT: Hybrid fragmental/topological method calculated by |
1.89 |
Consensus Log Po/w? Consensus Log Po/w: Average of all five predictions |
1.36 |
Log S (ESOL):? ESOL: Topological method implemented from |
-1.9 |
Solubility | 2.02 mg/ml ; 0.0125 mol/l |
Class? Solubility class: Log S scale |
Very soluble |
Log S (Ali)? Ali: Topological method implemented from |
-1.61 |
Solubility | 3.95 mg/ml ; 0.0245 mol/l |
Class? Solubility class: Log S scale |
Very soluble |
Log S (SILICOS-IT)? SILICOS-IT: Fragmental method calculated by |
-2.65 |
Solubility | 0.364 mg/ml ; 0.00226 mol/l |
Class? Solubility class: Log S scale |
Soluble |
GI absorption? Gatrointestinal absorption: according to the white of the BOILED-Egg |
High |
BBB permeant? BBB permeation: according to the yolk of the BOILED-Egg |
Yes |
P-gp substrate? P-glycoprotein substrate: SVM model built on 1033 molecules (training set) |
No |
CYP1A2 inhibitor? Cytochrome P450 1A2 inhibitor: SVM model built on 9145 molecules (training set) |
Yes |
CYP2C19 inhibitor? Cytochrome P450 2C19 inhibitor: SVM model built on 9272 molecules (training set) |
No |
CYP2C9 inhibitor? Cytochrome P450 2C9 inhibitor: SVM model built on 5940 molecules (training set) |
No |
CYP2D6 inhibitor? Cytochrome P450 2D6 inhibitor: SVM model built on 3664 molecules (training set) |
No |
CYP3A4 inhibitor? Cytochrome P450 3A4 inhibitor: SVM model built on 7518 molecules (training set) |
No |
Log Kp (skin permeation)? Skin permeation: QSPR model implemented from |
-6.64 cm/s |
Lipinski? Lipinski (Pfizer) filter: implemented from |
0.0 |
Ghose? Ghose filter: implemented from |
None |
Veber? Veber (GSK) filter: implemented from |
0.0 |
Egan? Egan (Pharmacia) filter: implemented from |
0.0 |
Muegge? Muegge (Bayer) filter: implemented from |
1.0 |
Bioavailability Score? Abbott Bioavailability Score: Probability of F > 10% in rat |
0.56 |
PAINS? Pan Assay Interference Structures: implemented from |
0.0 alert |
Brenk? Structural Alert: implemented from |
0.0 alert: heavy_metal |
Leadlikeness? Leadlikeness: implemented from |
No; 1 violation:MW<1.0 |
Synthetic accessibility? Synthetic accessibility score: from 1 (very easy) to 10 (very difficult) |
1.05 |
* 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 |
---|---|---|
93% | With sodium hydride; In N,N-dimethyl-formamide; at 20℃; for 24h; | A solution of 1H-indole-5-carboxylic acid (1.6 g, 10 mmol), sodium hydride (1.2 g, 30 mmol), iodomethane (6.2 mL, 100 mmol) and DMF (40 mL) was stirred and room temperature for 24 hr. The reaction mixture was then quenched with water (5 mL) and diluted with ether (150 mL) and ethyl acetate (50 mL). After washing with aq. NH4Cl (100 mL), water (100 mL) and then brine (100 mL), the organic layer was dried over MgSO4, filtered and concentrated. The remaining material was subjected to flash chromatography (ethyl acetate/hexane 1:4) to provide 1-methyl-1H-indole-5-carboxylic acid methyl ester as a crystalline solid (1.77 g, 93% yield). 1H NMR (400 MHz, CDCl3) delta 8.40 (s, 1H), 7.94 (d, 1H, J=9.0 Hz), 7.34 (d, 1H, J=9.0 Hz), 7.12 (d, 1H, J=2.9 Hz), 6.60 (d, 1H, J=2.9 Hz), 3.94 (s, 3H), 3.83 (s, 3H). |
93% | A solution of l//-indole-5-carboxylic acid (1.6 g, 10 mmol), sodium hydride (1.2 g, 30 mmol), iodomethane (6.2 mL, 100 mmol) and DMF (40 mL) was stirred and room temperature for 24 hr. The reaction mixture was then quenched with water (5 mL) and diluted with ether (150 mL) and ethyl acetate (50 mL). After <n="94"/>washing with aq. NH4Cl (100 mL), water (100 mL) and then brine (100 mL), the organic layer was dried over MgSO4, filtered and concentrated. The remaining material was subjected to flash chromatography (ethyl acetate/hexane 1:4) to provide 1 -methyl- l//-indole-5-carboxylic acid methyl ester as a crystalline solid (1.77 g, 93% yield). 1H NMR (400 MHz, CDCl3) delta 8.40 (s, IH), 7.94 (d, IH, J = 9.0 Hz), 7.34 (d, IH, J = 9.0 Hz), 7.12 (d, IH, J = 2.9 Hz), 6.60 (d, IH, J = 2.9 Hz), 3.94 (s, 3H), 3.83 (s, 3H). | |
66.43% | With sodium hydride; In N,N-dimethyl-formamide; for 1h;Inert atmosphere; Cooling with ice; | In the atmosphere of nitrogen and ice bath conditions,Compound 5-carboxylic acid hydrazine (0302-104) (1 g, 6.2 mmol, 1 eq.)Dissolved in 10 ml of DMF,Sodium hydride (744 mg, 18.6 mmol, 3 eq) was slowly added.After stirring the mixture for 15 minutes,Methyl iodide (2.2 g, 15.5 mmol, 2.5 eq.) was added dropwise thereto.The mixture was stirred at ice bath for 1 hour. After the reaction is completed, add water to quench and filter to obtain the targetCompound 1-methyl-1H-indole-5-carboxylic acid methyl ester (780 mg, yield: 66.43%) was a yellow solid. |
56% | To a stirred suspension of 0.99 g (24.8 mmol) of sodium hydride (60% oil dispersion), which had been previously washed 3X with hexanes, in anhydrous DMF (50 mL) is added lH-indole-5-carboxylic acid (2.0 g, 12.4 mmol). The mixture is stirred at rt for 30 min and methyl iodide (3.09 mL, 49.7 mmol) is added. The mixture is stirred overnight and diluted with water, extracted with EtOAc (3x). The combined organic layers are washed with water and brine, dried over anhydrous sodium sulfate, filtered and concentrated in vacuo. The crude product is purified by flash chromatography on silica gel. Elution with hexanes-EtOAc (90: 10) gives methyl 1-METHYL-LH-INDOLE-5-CARBOXYLATE as a white solid (1.32 g, 56%) : LH NMR (400 MHz, CDC13) 8 8.44, 7.97, 7. 37, 7D6, 6.63, 3.97, 3.87. | |
With NaH; In water; N,N-dimethyl-formamide; | (192-1) Under nitrogen atmosphere, a solution of indole-5-carboxylic acid (1.05 g) in DMF (40 mL) was cooled to 0 C., and thereto was added NaH (544 mg, 60%), and the mixture was stirred at the same temperature for 10 minutes, and stirred at room temperature for 30 minutes. The mixture was cooled to 0 C., and thereto was added iodomethane (3.68 g), and the mixture was stirred at room temperature for 48 hours. Water was added to the mixture, and the mixture was extracted three times with ethyl acetate-toluene, and dried over MgSO4. The solvent was evaporated under reduced pressure to give a crude methyl 1-methylindole-5-carboxylate. | |
With NaH; In water; N,N-dimethyl-formamide; | (192-1) Under nitrogen atmosphere, a solution of indole-5-carboxylic acid (1.05 g) in DMF (40 mL) was cooled to 0C, and thereto was added NaH (544 mg, 60 %), and the mixture was stirred at the same temperature for 10 minutes, and stirred at room temperature for 30 minutes. The mixture was cooled to 0C, and thereto was added iodomethane (3.68 g), and the mixture was stirred at room temperature for 48 hours. Water was added to the mixture, and the mixture was extracted three times with ethyl acetate-toluene, and dried over MgSO4. The solvent was evaporated under reduced pressure to give a crude methyl 1-methylindole-5-carboxylate. | |
To a solution of indole-carboxylic acid (5 g, 1 eq.) in DMF (250 ml) was added dry NaH (3.75 g, 5 eq.), freshly prepared by washing 60% NaH in mineral oil with hexane. After the mixture was stirred at room temperature for 40 minutes, iodomethane (20 mL, 10 eq.) was added. After being stirred for 20 hours, the reaction mixture was poured into a IM NaHSO4 aqueous solution (30 mL), and extracted with ethyl acetate. The organic layer was back-extracted sequentially with water, a saturated aqueous NaHCtheta3 solution, dried over MgSO4, filtered, and concentrated to afford a crude product as an oil 1-37. |
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