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Structure of 4-Ethynyltoluene
CAS No.: 766-97-2
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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.
4.5
*For Research Use Only !
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Rodriguez, Diego F. ; Duran-Osorio, Francisca ; Duarte, Yorley ; Olivares, Pedro ; Moglie, Yanina ; Dua, Kamal , et al.
Abstract: Green chemistry implementation has led to promising results in waste reduction in the pharmaceutical industry. However, the early sustainable development of pharmaceutically active compounds and ingredients remains a considerable challenge. Herein, we wish to report a green synthesis of new pharmaceutically active peptide triazoles as potent factor Xa inhibitors, an important drug target associated with the treatment of diverse cardiovascular diseases. The new inhibitors were synthesized in three steps, featuring cycloaddition reactions (high atom economy), microwave-assisted organic synthesis (energy efficiency), and copper nanoparticle catalysis, thus featuring Earth-abundant metals. The molecules obtained showed FXa inhibition, with IC50-values as low as 17.2 μM and no associated cytotoxicity in HEK293 and HeLa cells. These results showcase the environmental potential and chemical implications of the applied methodologies for the development of new molecules with pharmacological potential.
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Keywords: DOACs ; FXa inhibitors ; Ullmann-Goldberg reaction ; click chemistry ; drug discovery ; green chemistry ; microwave synthesis
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Krzysztof Kuciński ; Grzegorz Hreczycho ;
Abstract: Commercially available and inexpensive potassium bis(trimethylsilyl)amide (KHMDS) serves as an efficient transition metal-free catalyst for the catalytic sp C−H silylation of several terminal alkynes including two pharmaceuticals. Overall, the presented system allows the synthesis of various attractive silylacetylenes under mild conditions, making this approach an environmentally benign and sustainable alternative to existing synthetic solutions.
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Purchased from AmBeed: 768-60-5 ; 40307-11-7 ; 171290-52-1 ; 766-83-6 ; 886363-40-2 ; 62452-73-7 ; 1945-84-2 ; 29079-00-3 ; 766-97-2 ; 705-31-7 ; 23152-99-0 ; 14630-40-1 ; 766-47-2 ; 873-73-4 ; 2510-23-8 ; 704-41-6 ; 67237-53-0 ; 160542-02-9 ; 766-49-4 ; 769-26-6
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| CAS No. : | 766-97-2 |
| Formula : | C9H8 |
| M.W : | 116.16 |
| SMILES Code : | CC1=CC=C(C#C)C=C1 |
| MDL No. : | MFCD00008571 |
| InChI Key : | KSZVOXHGCKKOLL-UHFFFAOYSA-N |
| Pubchem ID : | 13018 |
| GHS Pictogram: |
|
| Signal Word: | Danger |
| Hazard Statements: | H225-H302+H312+H332-H315-H319-H335 |
| Precautionary Statements: | P241-P242-P261-P264-P270-P271-P280-P302+P352-P304+P340-P305+P351+P338-P312-P330-P362+P364-P370+P378-P374-P380-P501 |
| Class: | 3 |
| UN#: | 3295 |
| Packing Group: | Ⅲ |
| Num. heavy atoms | 9 |
| Num. arom. heavy atoms | 6 |
| Fraction Csp3 | 0.11 |
| Num. rotatable bonds | 0 |
| Num. H-bond acceptors | 0.0 |
| Num. H-bond donors | 0.0 |
| Molar Refractivity | 39.34 |
| TPSA ? Topological Polar Surface Area: Calculated from |
0.0 Ų |
| Log Po/w (iLOGP)? iLOGP: in-house physics-based method implemented from |
2.28 |
| Log Po/w (XLOGP3)? XLOGP3: Atomistic and knowledge-based method calculated by |
3.03 |
| Log Po/w (WLOGP)? WLOGP: Atomistic method implemented from |
2.06 |
| Log Po/w (MLOGP)? MLOGP: Topological method implemented from |
4.08 |
| Log Po/w (SILICOS-IT)? SILICOS-IT: Hybrid fragmental/topological method calculated by |
2.96 |
| Consensus Log Po/w? Consensus Log Po/w: Average of all five predictions |
2.88 |
| Log S (ESOL):? ESOL: Topological method implemented from |
-2.96 |
| Solubility | 0.127 mg/ml ; 0.00109 mol/l |
| Class? Solubility class: Log S scale |
Soluble |
| Log S (Ali)? Ali: Topological method implemented from |
-2.7 |
| Solubility | 0.234 mg/ml ; 0.00202 mol/l |
| Class? Solubility class: Log S scale |
Soluble |
| Log S (SILICOS-IT)? SILICOS-IT: Fragmental method calculated by |
-2.81 |
| Solubility | 0.179 mg/ml ; 0.00154 mol/l |
| Class? Solubility class: Log S scale |
Soluble |
| GI absorption? Gatrointestinal absorption: according to the white of the BOILED-Egg |
Low |
| BBB permeant? BBB permeation: according to the yolk of the BOILED-Egg |
No |
| 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) |
No |
| 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 |
-4.86 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 |
2.0 |
| Bioavailability Score? Abbott Bioavailability Score: Probability of F > 10% in rat |
0.55 |
| PAINS? Pan Assay Interference Structures: implemented from |
0.0 alert |
| Brenk? Structural Alert: implemented from |
1.0 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) |
1.57 |
* 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.

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| Yield | Reaction Conditions | Operation in experiment |
|---|---|---|
| 74% | General procedure: A dry sealed tube was charged with 1.1 mmol (271 mg) of 2-iodoaniline and 2 equiv. of K3PO4 (424 mg). To the above mixture was added 1 mmol of phenylacetylene (102 mg, 0.109 ml), 5 mol % of Et2Zn (0.05 ml), 10 mol % of DMEDA (0.01 ml) and 3 ml of acetonitrile under nitrogen. The sealed tube was heated in an oil bath which was preheated to 125 C and the reaction mixture was stirred under the same conditions for 12 hours. After that 2 equiv. of NaOtBu (192 mg) was added to the reaction mixture and allowed to stir for another six hours. The reaction mixture was then cooled and extracted with ethyl acetate (3 x 15 ml) and the ethyl acetate layer was washed with distilled water. The organic layer was dried over anhydrous Na2SO4 and the solvent was removed under reduced pressure in a rotary evaporator. The crude residue was purified by column chromatography using hexane as the eluent to get 172 mg (89 %) of the product as a colourless solid. All other benzofuran derivatives were synthesized by similar procedure. |
| Yield | Reaction Conditions | Operation in experiment |
|---|---|---|
| 92% | With C22H20Cl4N4O2PdS; potassium carbonate; In ethanol; at 80℃; for 1h; | General procedure: K2CO3 (2.5 × 10-4 mol, 2.5 equiv), aryl iodide (1.0 × 10-4 mol, 1.0 equiv), and alkyne (1.5 × 10-4 mol, 1.5 equiv) were mixed in a 10-mL vial, followed by addition of a solution of the selected catalyst (1 × 10-8 mol) in EtOH (1 mL). The vial was placed in a preheated oil bath at 80 C and stirred for 1 h. After cooling to 20-25 C, the reaction mixture was evaporated to dryness under a stream of dinitrogen followed by addition of 1.0 equiv of 1,2-dimethoxyethane as NMR internal standard, and extraction of the reaction mixture with three 0.20-mL portions of CDCl3. All fractions were joined and analyzed by 1H NMR spectroscopy. The product peak assignments were based on the authentic samples or on published dat, whereas quantifications were performed upon integration of the selected peak of the product relatively to the peak of the standard. |
[ 16066-09-4 ]
[ 766-97-2 ]

| Yield | Reaction Conditions | Operation in experiment |
|---|---|---|
| 82% | With copper(l) iodide; palladium 10% on activated carbon; triethylamine; triphenylphosphine; In 1,4-dioxane; at 25 - 80℃; for 3.5h;Inert atmosphere; | General procedure: (a) The reaction was performed in a bigger scale using 100 mg of 10% Pd/C (0.092 mmol), PPh3 (0.37 mmol), CuI (0.184 mmol), Et3N (10.68 mmol), compound 1a (3.56 mmol), and acetylenic compound 2a (5.32 mmol) in 1,4-dioxane (20.0 mL). After stirring at 80 C for 3 h under nitrogen the mixture was cooled to room temperature. The Pd/C was filtered off and washed with water (2 10 mL), acetone (2 10 mL), and EtOAc (2 10 mL). Then the catalyst was collected, dried at 100 C in an oven, and reused for the next run. The co-catalyst CuI along with PPh3 was added in every repeated run. (b) General method for the preparation of 3: A mixture of compound 1 (0.89 mmol), 10% Pd/C (0.023 mmol), PPh3 (0.092 mmol), CuI (0.046 mmol), and Et3N (2.67 mmol) in 1,4-dioxane (5.0 mL) was stirred at 25 C for 30 min under nitrogen. The acetylenic compound 2 (1.33 mmol) was added slowly with stirring. The mixture was then stirred at 80 C for 3 h, cooled to room temperature, diluted with EtOAc (30 mL), and filtered through celite. The filtrate was collected and concentrated. The residue was purified by column chromatography (2-15% EtOAc/hexane) to afford the desired product |
[ 2568-25-4 ]
[ 103-49-1 ]
[ 766-97-2 ]
| Yield | Reaction Conditions | Operation in experiment |
|---|---|---|
| 50% | With indium(III) chloride; In toluene;Inert atmosphere; Reflux; | General procedure: Acetal (1.2 mmol), alkyne (1.2 mmol), dibenzylamine (0.192 mL,1.0 mmol), and InCl3 (10 molpercent) were added to a flask (25 mL), followedby the addition of toluene (2.0 mL) under argon. The mixture was stirredunder reflux and monitored by TLC. The solution was then cooled to r.t.,diluted with dichloromethane (5.0 mL), washed with brine. The aqueouslayer was extracted with CH2Cl2 (3 × 10 mL), the combined organic layer was dried over MgSO4, filtered, and evaporated under vacuum. Theresidue was purified by column chromatography on silica gel (petroleumether) to afford the desired product. |
| Yield | Reaction Conditions | Operation in experiment |
|---|---|---|
| 73% | With potassium phosphate; diethylzinc; N,N`-dimethylethylenediamine; In acetonitrile; at 125℃; for 12h;Sealed tube; Inert atmosphere; | General procedure: A dry sealed tube was charged with 1.1 mmol (271 mg) of 2-iodophenol and 2 equiv. of K3PO4 (424 mg). To the above mixture was added 1 mmol of phenylacetylene (102 mg, 0.109 ml), 5 mol % of Et2Zn (0.05 ml), 10 mol % of DMEDA (0.01 ml) and 3 ml of acetonitrile under nitrogen. The sealed tube was heated in an oil bath which was preheated to 125 C and the reaction mixture was stirred under the same conditions for 12 hours. The reaction mixture was then cooled and extracted with ethyl acetate (3 x 15 ml) and the ethyl acetate layer was washed with distilled water. The organic layer was dried over anhydrous Na2SO4 and the solvent was removed under reduced pressure in a rotary evaporator. The crude residue was purified by column chromatography using hexane as the eluent to get 180 mg (93 %) of the product as a colourless solid. All other benzofuran derivatives were synthesized by similar procedure. |
| Yield | Reaction Conditions | Operation in experiment |
|---|---|---|
| With palladium diacetate; caesium carbonate; bis[2-(diphenylphosphino)phenyl] ether; In N,N-dimethyl-formamide; at 100℃; for 2h;Sealed tube; Inert atmosphere; | General procedure: In a 15 mL sealed tube equipped with a magnetic stirring bar were added 1 (1 mmol),2 (0.8 mmol), tert-butyl isocyanide (1.2 mmol, 136 muL), Pd(OAc)2 (0.03 mmol, 7 mg),DPEPhos (0.06 mmol, 32 mg), Cs2CO3 (0.8 mmol, 261 mg), and anhydrous DMF (2.0mL). The tube was purged with argon, and the contents were stirred at 100 °C for 2 h.Then Na2S*9H2O (1.2 mmol, 240 mg) was added for 2 h. After reaction completion,the mixture was filtered through a pad of Celite, and DMF was removed by a vacuum.The combined filtrates were refluxed in THF (15 mL) and oxalic acid (1 M, 3 mL) for 8h. The solvents were removed under reduced pressure, then poured into brine (20mL) and extracted by ethyl acetate (3 × 30 mL). The combined organic layers weredried (Na2SO4) and evaporated. The residue was purified on a silica gel column usingpetroleum ether/ethyl acetate as the eluent to give the pure target product. |
| Yield | Reaction Conditions | Operation in experiment |
|---|---|---|
| 58% | With potassium phosphate; C43H36N4O4Pd; In dimethylsulfoxide-d6; at 90℃; for 10h; | General procedure: In a typical run, performed in air, a 25 mL of round bottom askwas charged with a mixture of 2-iodophenol (0.50 mmol), terminalalkyne (0.60 mmol), and K3PO4 (1.00 mmol). A palladium complex(2a or 2b, 0.0005 mmol) was added to the mixture, followed byDMSO (ca. 2 mL) as a solvent, and then the reaction mixture washeated (either at 90C or at 120C) for 10 h. The reaction mixturewas cooled to room temperature, and water (ca. 20 mL) was added.The resulting mixture was extracted with EtOAc (ca. 50 mL). Theorganic layer was further extracted with EtOAc (ca. 2 20 mL). Theorganic layers were combined and vacuum dried to obtain a crudeproduct that was subsequently puried by column chromatog-raphy. The obtained benzofuran derivatives (3aa3ap) were char-acterized by NMR and Mass spectroscopy (See SupportingInformation Figures S4-S23). |