Structure of 403-25-8
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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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CAS No. : | 403-25-8 |
Formula : | C7H5F2NO2 |
M.W : | 173.12 |
SMILES Code : | O=[N+](C1=CC(C(F)F)=CC=C1)[O-] |
MDL No. : | MFCD18071057 |
InChI Key : | QOGPXSPKXMNSLH-UHFFFAOYSA-N |
Pubchem ID : | 21407905 |
GHS Pictogram: |
![]() |
Signal Word: | Warning |
Hazard Statements: | H319 |
Precautionary Statements: | P305+P351+P338 |
Num. heavy atoms | 12 |
Num. arom. heavy atoms | 6 |
Fraction Csp3 | 0.14 |
Num. rotatable bonds | 2 |
Num. H-bond acceptors | 4.0 |
Num. H-bond donors | 0.0 |
Molar Refractivity | 40.33 |
TPSA ? Topological Polar Surface Area: Calculated from |
45.82 Ų |
Log Po/w (iLOGP)? iLOGP: in-house physics-based method implemented from |
1.34 |
Log Po/w (XLOGP3)? XLOGP3: Atomistic and knowledge-based method calculated by |
2.71 |
Log Po/w (WLOGP)? WLOGP: Atomistic method implemented from |
3.05 |
Log Po/w (MLOGP)? MLOGP: Topological method implemented from |
2.61 |
Log Po/w (SILICOS-IT)? SILICOS-IT: Hybrid fragmental/topological method calculated by |
0.55 |
Consensus Log Po/w? Consensus Log Po/w: Average of all five predictions |
2.05 |
Log S (ESOL):? ESOL: Topological method implemented from |
-2.86 |
Solubility | 0.24 mg/ml ; 0.00138 mol/l |
Class? Solubility class: Log S scale |
Soluble |
Log S (Ali)? Ali: Topological method implemented from |
-3.33 |
Solubility | 0.0818 mg/ml ; 0.000473 mol/l |
Class? Solubility class: Log S scale |
Soluble |
Log S (SILICOS-IT)? SILICOS-IT: Fragmental method calculated by |
-2.38 |
Solubility | 0.72 mg/ml ; 0.00416 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 |
-5.43 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 |
0.55 |
PAINS? Pan Assay Interference Structures: implemented from |
0.0 alert |
Brenk? Structural Alert: implemented from |
2.0 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) |
1.67 |
* 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 |
---|---|---|
99% | With diethylamino-sulfur trifluoride; In dichloromethane; at -78 - 20℃; | Step 1 : DAST (16.5 mL, 125 mmol) was added dropwise to a -78 C solution of 3- nitrobenzaldehyde (3.78 g, 25 mmol) in dichloromethane (20 mL). The mixture was stirred for 15 min and then allowed to warm to room temperature. After 4 hrs, TLC showed incomplete conversion, so the mixture was cooled again to -78 C and additional DAST (1 .5 mL, 125 mmol) was added. The mixture was allowed to warm to room temperature and was stirred overnight. The mixture was poured in ice and dilute NH40H(aq) and extracted 2x with dichloromethane. The combined organic extracts were washed with brine and dried over sodium sulfate. Filtration and solvent evaporation gave a residue which was passed over a short plug of silica eluting with 10% ethyl acetate in hexanes to yield 1 -(difluoromethyl)-3-nitrobenzene (4.3 g, 24.8 mmol, 99%). |
97.3% | With diethylamino-sulfur trifluoride; In dichloromethane; at -78 - 20℃; for 15h; | Preparation Example 7-1 The synthesis of 1-(difluoromethyl)-3-nitrobenzene DAST (20 ml, 13.23 mmol) diluted in 5 ml of dichloromethane was slowly dropped at -78 C. into 3-nitrobenzaldehyde (1 g, 6.61 mmol) dissolved in 20 ml of dichloromethane and the mixture was stirred for 15 hours at room temperature. After adding 100 ml of water and extraction with 100 ml of dichloromethane, the organic layer was concentrated under vacuum and column chromatography (ethylacetate/n-hexane, 1/15) was carried out to obtain the title compound (1.11 g, 97.3%) as brown oil. 1H-NMR (400 MHz, CDCl3); δ 8.40 (s, 1H), 8.37-8.35 (m, 1H), 7.87 (d, J=7.6 Hz, 1H), 7.69 (t, J=8.0 Hz, 1H), 6.75 (t, J=56.0 Hz, 1H) |
79% | With diethylamino-sulfur trifluoride; In dichloromethane; at -78 - 20℃; for 2h;Inert atmosphere; | To a solution of Compound 1 (0.5 g, 3.3 mmol) in anhydrous DCM (10 mL) was added DAST(1.3 g, 7.95 mmol) drop-wise at -78 C under N2. The reaction mixture was stirred at rt for 2 h, and poured into a beaker containing 5 g of ice, decomposing any unreacted DAST. The mixture was extracted twice with DCM (45 mL). The combined organic layer was washed with 50 mL of water, and dried over anhydrous magnesium sulfate. Evaporation to dryness under reduced pressure gives crude product which was purified by silica gel chromatography (eluted with PE: EA=100: 1) to afford Compound 2 (0.45 g, yield: 79%). |
78% | With (bis-(2-methoxyethyl)amino)sulfur trufluoride; In dichloromethane; toluene; at 20℃; | To a solution of 2.6 g (17 mmol) of 3-nitrobenzaldehyde in 5 ml_ of dichloromethane is added 11.4 ml_ of 50% bis(2-methoxyethyl)aminosulfurtrifluoride <n="82"/>solution in toluene. The mixture is stirred overnight at room temperature, washed twice with a saturated aqueous sodium hydrogen carbonate solution then with brine, dried over magnesium sulfate, filtered and concentrated under reduced pressure. The residue is purified over 150 g of silica gel (eluant heptane/ethyl acetate 85/15) to give 2.3 g (78%) of 1-difluoromethyl-3-nitrobenzene as an oil.1H NMR: 8.4 (s, 1 H) ; 8.35 (d, 1 H, J = 7,5) ; 7.9 (d, 1 H, J = 7.5) ; 7,7 (t, 1 H, J = 7.5) ; 7.0 (t, 1 H1 J = 55) |
332 mg | With diethylamino-sulfur trifluoride; In dichloromethane; at -78 - 20℃; for 3h; | To a stirred solution of 3-nitrobenzaldehyde (506 mg, 3.35 mmol) in anhydrous dichloromethane (10 mL) was dropwise added DAST (1.32 mL, 10.04 mmol) at -78 C. The mixture was gradually warmed up to RT and stirred for 3 h. The mixture was quenched with saturated sodium bicarbonate solution and extracted twice with ethyl acetate. The combinedorganic extracts were washed with brine and dried over anhydrous sodium sulfate. The solution was filtered and concentrated under reduced pressure and the residue obtained was purified by silica gel column chromatography to yield 332 mg of the desired compound. The compound was as such taken forward to the next step without characterization. |
55 g | With diethylamino-sulfur trifluoride; In dichloromethane; at -78 - 20℃; for 2h; | To a solution of 3-nitrobenzaldehyde (50.0 g, 331 mmol) in DCM (800 ml) was added diethylaminosulfur trifluoride (130 ml, 990 mmol) at -78 C. After stirring at rt for 2 h, the reaction mixture was poured into ice-water and extracted with DCM. The organic phase was concentrated and purified by silica gel chromatography (1000 mesh, petroleum ether: ethyl acetate = 1: 0, then 100: 1) to give 1-(difluoromethyl)-3-nitrobenzene (55.0 g) as yellow oil. 1H NMR (400 MHz, DMSO-d6): δ [ppm] = 8.42-8.38 (m, 2H), 8.06 (d, J = 8.0 Hz, 1H), 7.86-7.82 (m, 1H), 7.22 (t, J = 55.2 Hz, 1H). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
50% | With iron; acetic acid; for 1h;Reflux; | Preparation Example 7-2 The synthesis of 3-(difluoromethyl)aniline 100 mg of Fe was added intio 3 ml of acetic acid and refluxed for 15 minutes. After lowering the temperature into room temperature, the mixture was added with <strong>[403-25-8]1-(difluoromethyl)-3-nitrobenzene</strong> (0.2 g, 1.15 mmol) and refluxed again for 1 hour. After addition of 20 ml ethyl acetate, impurities were removed using cellite and the organic layer was concentrated under vacuum. After column chromatography (ethylacetate/n-hexane, 1/15), the title compound (0.16 g, 50%) was obtained. 1H-NMR (600 MHz, CDCl3); δ 7.22 (t, J=7.8 Hz, 1H), 6.86 (d, J=7.8 Hz, 1H), 6.81 (s, 1H), 6.77-6.75 (m, 1H), 6.54 (t, J=56 Hz, 1H), 3.91 (brs, 2H) |
With palladium on activated charcoal; hydrogen; In ethanol; | A solution of Compound 2 (0.45 g, 2.9 mmol) and Pd/C(50 mg) in EtOH (5 mL) was stirred at rt under H2 atmosphere overnight. The Pd/C was removed by filtered. The filtrate was concentrated in vacuo to give the desired product, which was used for the next step directly | |
0.85 g | With iron; ammonium chloride; In ethanol; water; at 80℃; for 4h; | To a stirred solution of <strong>[403-25-8]1-(difluoromethyl)-3-nitrobenzene</strong> (0.9 g, 5 mmol) in ethanol:water (15:3 mL) was added iron powder (3.0 g, 52 mmol) and ammoniumchloride (0.3 g, 5 mmol) at ambient temperature. The reaction mixture was refluxed at 80 C. for 4 h. Completion of the reaction was confirmed by TLC. The reaction mixture was filtered through bed of celite and the filtrate was concentrated under vacuum to afford 3-(difluoromethyl) aniline (0.85 g) as brown gummy solid. MS (ESI) m/z 144 [M+1]+. |
42 g | With iron; ammonium chloride; In methanol; water; at 70℃; for 12h; | To a solution of <strong>[403-25-8]1-(difluoromethyl)-3-nitrobenzene</strong> (55.0 g, 318 mmol) in a mixed solvent of methanol (500 ml) and water (200 ml) were added iron (53.2 g, 953 mmol) and ammonium chloride (85.0 g, 1.59 mol). The reaction mixture was stirred at 70 C for 12 h. The reaction mixture was cooled to rt and filtered. The filtrate was diluted with water and extracted with ethyl acetate. The organic phase was washed with brine, dried over anhydrous sodium sulfate and filtered. The filtrate was concentrated under reduced pressure to give 3-(difluoromethyl)aniline (42.0 g) as yellow oil. 1H NMR (400 MHz, DMSO-d6): δ [ppm] = 7.11 (t, J = 8.0 Hz, 1H), 6.82 (t, J = 56.4 Hz, 1H), 6.72-6.62 (m, 3H), 5.35 (s, 2H). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
56.3% | With N-Bromosuccinimide; sulfuric acid; In water; at 20 - 60℃; for 1.5h; | Step 2: l-(Difluoromethyl)-3-nitrobenzene (866 mg, 5.00 mmol) was added to cold cone.H2SO4 and then NBS (890 mg, 5.00 mmol) was added. The mixture was warmed to room temperature for 30 minutes then 50-60 C for 1 h. The mixture was then poured in water and ice and extracted diethyl ether twice. The organic layer was washed with dilute aqueous NaHC03 and brine. Purification by chromatography on silica gel (0-15% ethyl acetate in hexanes) yielded l-bromo-3-(difluoromethyl)-5-nitrobenzene (710 mg, 2.82 mmol, 56.3%). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
60% | With tris-(dibenzylideneacetone)dipalladium(0); potassium carbonate; hydroquinone; 4,5-bis(diphenylphosphino)-9,9-dimethylxanthene; In 1,4-dioxane; at 110℃; for 48h;Schlenk technique; Inert atmosphere; | General procedure: According to the general method A, the reaction was carried out with 0.3 mmol of arylboronic acid to give 4 (44 mg, yield: 72%).The product was purified by silica gel column chromatography.(n-hexane), a colorless, transparent oil. _: General Method A: Palladium catalyzed difluoromethylation of chlorodifluoroethane and arylboronic acid or ethylene arylborate. Add anhydrous K2CO3 (powder, 4.0 when) to a 25 mL Schlenk back bottle with argon anhydrous and anaerobic protection.Amount), hydroquinone (2.0 equivalents), Pd2 (dba) 3 (2.5 mol%), Xantphos (7.5 mol%) and ArB(OH) 2 (0.3 or 0.5 mmol) or Ar-Beg (0.3 or 0.5 mmol) Level reaction).Then add ClCF2H in 1,4 dioxane solution (2.0M,1.5 mL, 0.3 mmol grade reaction or 2.5 mL, 0.5 mmol grade reaction, 10 equivalents) and freshly distilled 1,4 dioxane (1.0 mL,0.3 mmol level reaction or 2.5 mL, 0.5 mmol level reaction).After the plug was plugged, the reaction mixture was heated to 110 C and stirred for 48 hours.After the completion of the reaction, the column chromatography was concentrated to give the object product. |
1.5 g | With diethylamino-sulfur trifluoride; In dichloromethane; at 20℃; for 18h;Inert atmosphere; | General procedure: A solution of 2-fluoro-5-nitrobenzaldehyde (3.0 g, 17 mmol) in DCM (50 mL) was added DAST (3.42 g, 21 mmol) and stirred at RT for 18 h under nitrogen atmosphere. The reaction mass was quenched in ice-water and extracted with DCM. The organic layer was dried and concentrated to afford 2.5 g of desired product. 1H NMR (300 MHz, DMSO 6): δ 7.31 (s, 1H), 7.69 (t, / = 8.7 Hz, 1H), 8.46-8.50 (m, 2H). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
60% | With tris-(dibenzylideneacetone)dipalladium(0); potassium carbonate; hydroquinone; 4,5-bis(diphenylphosphino)-9,9-dimethylxanthene; In 1,4-dioxane; at 110℃; for 48h;Inert atmosphere; Sealed tube; | General procedure: To a 25 ml sealed tube were added anhydrous K2CO3 (powder, 4.0 equiv.), hydroquinone (2.0 equiv.), Pd2(dba)3 (2.5 mol%), Xantphos (7.5 mol%) and ArB(OH)2 (0.3 or 0.5 mmol) or Ar-Beg (0.3 or 0.5 mmol) under argon. A solution of ClCF2H in 1,4-dioxane (2.0 M, 1.5 ml for 0.3 mmol scale or 2.5 ml for 0.5 mmol scale, 10 equiv.) and fresh distilled 1,4-dioxane (1.0 ml for 0.3 mmol scale or 2.5 ml for 0.5 mmol scale) were added subsequently. The sealed tube was screw capped and heated to 110 C (oil bath). After stirring for 48 h, the reaction was cooled to room temperature and fluorobenzene (1.0 equiv.) was added. The yield was determined by 19F NMR before working up. The reaction mixture was then diluted with ethyl acetate, filtered through a pad of Celite and concentrated. The residue was purified with silica gel chromatography to provide the desired product. |
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