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Chemical Structure| 1670-81-1 Chemical Structure| 1670-81-1
Chemical Structure| 1670-81-1

Indole-5-carboxylic acid

CAS No.: 1670-81-1

4.5 *For Research Use Only !

Cat. No.: A394775 Purity: 98%

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Product Citations

Product Citations

Shriver, James A. ; Kaller, Kaylie S. ; Kinsey, Ally L. , 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.

Alternative Products

Product Details of [ 1670-81-1 ]

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

Safety of [ 1670-81-1 ]

GHS Pictogram:
Signal Word:Warning
Hazard Statements:H315-H319-H335
Precautionary Statements:P261-P305+P351+P338

Calculated chemistry of [ 1670-81-1 ] Show Less

Physicochemical Properties

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
Ertl P. et al. 2000 J. Med. Chem.

53.09 Ų

Lipophilicity

Log Po/w (iLOGP)?

iLOGP: in-house physics-based method implemented from
Daina A et al. 2014 J. Chem. Inf. Model.

1.04
Log Po/w (XLOGP3)?

XLOGP3: Atomistic and knowledge-based method calculated by
XLOGP program, version 3.2.2, courtesy of CCBG, Shanghai Institute of Organic Chemistry

0.91
Log Po/w (WLOGP)?

WLOGP: Atomistic method implemented from
Wildman SA and Crippen GM. 1999 J. Chem. Inf. Model.

1.87
Log Po/w (MLOGP)?

MLOGP: Topological method implemented from
Moriguchi I. et al. 1992 Chem. Pharm. Bull.
Moriguchi I. et al. 1994 Chem. Pharm. Bull.
Lipinski PA. et al. 2001 Adv. Drug. Deliv. Rev.

1.08
Log Po/w (SILICOS-IT)?

SILICOS-IT: Hybrid fragmental/topological method calculated by
FILTER-IT program, version 1.0.2, courtesy of SILICOS-IT, http://www.silicos-it.com

1.89
Consensus Log Po/w?

Consensus Log Po/w: Average of all five predictions

1.36

Water Solubility

Log S (ESOL):?

ESOL: Topological method implemented from
Delaney JS. 2004 J. Chem. Inf. Model.

-1.9
Solubility 2.02 mg/ml ; 0.0125 mol/l
Class?

Solubility class: Log S scale
Insoluble < -10 < Poorly < -6 < Moderately < -4 < Soluble < -2 Very < 0 < Highly

Very soluble
Log S (Ali)?

Ali: Topological method implemented from
Ali J. et al. 2012 J. Chem. Inf. Model.

-1.61
Solubility 3.95 mg/ml ; 0.0245 mol/l
Class?

Solubility class: Log S scale
Insoluble < -10 < Poorly < -6 < Moderately < -4 < Soluble < -2 Very < 0 < Highly

Very soluble
Log S (SILICOS-IT)?

SILICOS-IT: Fragmental method calculated by
FILTER-IT program, version 1.0.2, courtesy of SILICOS-IT, http://www.silicos-it.com

-2.65
Solubility 0.364 mg/ml ; 0.00226 mol/l
Class?

Solubility class: Log S scale
Insoluble < -10 < Poorly < -6 < Moderately < -4 < Soluble < -2 Very < 0 < Highly

Soluble

Pharmacokinetics

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)
and tested on 415 molecules (test set)
10-fold CV: ACC=0.72 / AUC=0.77
External: ACC=0.88 / AUC=0.94

No
CYP1A2 inhibitor?

Cytochrome P450 1A2 inhibitor: SVM model built on 9145 molecules (training set)
and tested on 3000 molecules (test set)
10-fold CV: ACC=0.83 / AUC=0.90
External: ACC=0.84 / AUC=0.91

Yes
CYP2C19 inhibitor?

Cytochrome P450 2C19 inhibitor: SVM model built on 9272 molecules (training set)
and tested on 3000 molecules (test set)
10-fold CV: ACC=0.80 / AUC=0.86
External: ACC=0.80 / AUC=0.87

No
CYP2C9 inhibitor?

Cytochrome P450 2C9 inhibitor: SVM model built on 5940 molecules (training set)
and tested on 2075 molecules (test set)
10-fold CV: ACC=0.78 / AUC=0.85
External: ACC=0.71 / AUC=0.81

No
CYP2D6 inhibitor?

Cytochrome P450 2D6 inhibitor: SVM model built on 3664 molecules (training set)
and tested on 1068 molecules (test set)
10-fold CV: ACC=0.79 / AUC=0.85
External: ACC=0.81 / AUC=0.87

No
CYP3A4 inhibitor?

Cytochrome P450 3A4 inhibitor: SVM model built on 7518 molecules (training set)
and tested on 2579 molecules (test set)
10-fold CV: ACC=0.77 / AUC=0.85
External: ACC=0.78 / AUC=0.86

No
Log Kp (skin permeation)?

Skin permeation: QSPR model implemented from
Potts RO and Guy RH. 1992 Pharm. Res.

-6.64 cm/s

Druglikeness

Lipinski?

Lipinski (Pfizer) filter: implemented from
Lipinski CA. et al. 2001 Adv. Drug Deliv. Rev.
MW ≤ 500
MLOGP ≤ 4.15
N or O ≤ 10
NH or OH ≤ 5

0.0
Ghose?

Ghose filter: implemented from
Ghose AK. et al. 1999 J. Comb. Chem.
160 ≤ MW ≤ 480
-0.4 ≤ WLOGP ≤ 5.6
40 ≤ MR ≤ 130
20 ≤ atoms ≤ 70

None
Veber?

Veber (GSK) filter: implemented from
Veber DF. et al. 2002 J. Med. Chem.
Rotatable bonds ≤ 10
TPSA ≤ 140

0.0
Egan?

Egan (Pharmacia) filter: implemented from
Egan WJ. et al. 2000 J. Med. Chem.
WLOGP ≤ 5.88
TPSA ≤ 131.6

0.0
Muegge?

Muegge (Bayer) filter: implemented from
Muegge I. et al. 2001 J. Med. Chem.
200 ≤ MW ≤ 600
-2 ≤ XLOGP ≤ 5
TPSA ≤ 150
Num. rings ≤ 7
Num. carbon > 4
Num. heteroatoms > 1
Num. rotatable bonds ≤ 15
H-bond acc. ≤ 10
H-bond don. ≤ 5

1.0
Bioavailability Score?

Abbott Bioavailability Score: Probability of F > 10% in rat
implemented from
Martin YC. 2005 J. Med. Chem.

0.56

Medicinal Chemistry

PAINS?

Pan Assay Interference Structures: implemented from
Baell JB. & Holloway GA. 2010 J. Med. Chem.

0.0 alert
Brenk?

Structural Alert: implemented from
Brenk R. et al. 2008 ChemMedChem

0.0 alert: heavy_metal
Leadlikeness?

Leadlikeness: implemented from
Teague SJ. 1999 Angew. Chem. Int. Ed.
250 ≤ MW ≤ 350
XLOGP ≤ 3.5
Num. rotatable bonds ≤ 7

No; 1 violation:MW<1.0
Synthetic accessibility?

Synthetic accessibility score: from 1 (very easy) to 10 (very difficult)
based on 1024 fragmental contributions (FP2) modulated by size and complexity penaties,
trained on 12'782'590 molecules and tested on 40 external molecules (r2 = 0.94)

1.05

Application In Synthesis [ 1670-81-1 ]

* 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.

  • Downstream synthetic route of [ 1670-81-1 ]

[ 1670-81-1 ] Synthesis Path-Downstream   1~2

  • 1
  • [ 1670-81-1 ]
  • [ 74-88-4 ]
  • [ 128742-76-7 ]
YieldReaction ConditionsOperation 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.

  • 2
  • [ 1670-81-1 ]
  • [ 128742-76-7 ]
 

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Technical Information

Categories

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