Structure of 6-Bromo-2-hexanone
CAS No.: 10226-29-6
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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. : | 10226-29-6 |
| Formula : | C6H11BrO |
| M.W : | 179.05 |
| SMILES Code : | CC(CCCCBr)=O |
| MDL No. : | MFCD00044891 |
| InChI Key : | CZGOECYPTLSLNI-UHFFFAOYSA-N |
| Pubchem ID : | 25061 |
| GHS Pictogram: |
|
| Signal Word: | Warning |
| Hazard Statements: | H302-H315-H319 |
| Precautionary Statements: | P261-P305+P351+P338 |
| Num. heavy atoms | 8 |
| Num. arom. heavy atoms | 0 |
| Fraction Csp3 | 0.83 |
| Num. rotatable bonds | 4 |
| Num. H-bond acceptors | 1.0 |
| Num. H-bond donors | 0.0 |
| Molar Refractivity | 39.03 |
| TPSA ? Topological Polar Surface Area: Calculated from |
17.07 Ų |
| Log Po/w (iLOGP)? iLOGP: in-house physics-based method implemented from |
2.02 |
| Log Po/w (XLOGP3)? XLOGP3: Atomistic and knowledge-based method calculated by |
1.36 |
| Log Po/w (WLOGP)? WLOGP: Atomistic method implemented from |
2.14 |
| Log Po/w (MLOGP)? MLOGP: Topological method implemented from |
1.91 |
| Log Po/w (SILICOS-IT)? SILICOS-IT: Hybrid fragmental/topological method calculated by |
2.09 |
| Consensus Log Po/w? Consensus Log Po/w: Average of all five predictions |
1.9 |
| Log S (ESOL):? ESOL: Topological method implemented from |
-1.54 |
| Solubility | 5.13 mg/ml ; 0.0286 mol/l |
| Class? Solubility class: Log S scale |
Very soluble |
| Log S (Ali)? Ali: Topological method implemented from |
-1.32 |
| Solubility | 8.55 mg/ml ; 0.0478 mol/l |
| Class? Solubility class: Log S scale |
Very soluble |
| Log S (SILICOS-IT)? SILICOS-IT: Fragmental method calculated by |
-2.69 |
| Solubility | 0.37 mg/ml ; 0.00207 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) |
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 |
-6.43 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 |
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) |
2.62 |
* 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 |
|---|---|---|
| 56% | A mixture of 1-methylcyclopentanol (4.00 g, 39.94 mmol) and K2CO3 (33.11 g, 239.6 mmol) in CHCl3 (130 mL) was stirred at 0 C. for 15 min., and then bromine (10.23 mL, 199.7 mmol) was then added. The reaction mixture was stirred at 0 C. for 2.5 hours, then poured slowly into an ice-chilled saturated aqueous Na2S2O3 solution (100 mL). The organic layer was separated, washed with water (2×100 mL), dried over MgSO4, filtered and concentrated in vacuo. The residue was purified by silica gel column (pet ether:EtOAc 3:1) give the desired product 6-bromohexan-2-one as a colorless oil (4 g). Yield 56% (98% purity, UV=214 nm, ESI no found). 1H- NMR (400 MHz, CDCl3) delta 1.66-1.80 (m, 2H), 1.82-1.93 (m, 2H), 2.15 (s, 3H), 2.48 (t, J=7.3 Hz, 2H), 3.41 (t, J=6.5 Hz, 2H) | |
| In a flame dried round-bottomed flask equipped with a magnetic stir bar and under inert atmosphere (N2), a solution of commercially available 1-methylcyclopentanol (4.00 g, 39.94 mmol) in CHCI3 (130 mL) at 0 0C was treated with K2CO3 (33.1 1 g, 239.62 mmol) <n="65"/>and the reaction mixture was stirred for 15 min. Bromine (10.23 ml_, 199.68 mmol) was then added and the reaction mixture was stirred at 0 0C for 2.5 h. The reaction mixture was slowly poured to an ice-chilled sat. aq. Na2S2O3 solution (100 ml_). The org. layer was washed with water (2 x 100 ml_), dried over MgSO4, filtered, and the solvent was removed under reduced pressure. Purification of the residue by FC (gradient hept ? 75:25 hept- EA) gave the title compound as a yellow oil: TLC: rf (75:25 hept-EA) = 0.36. 1H NMR (400 MHz, CDCI3) £ 1.66-1.80 (m, 2H), 1.82-1.93 (m, 2H), 2.15 (s, 3H), 2.48 (t, J = 7.3 Hz, 2H), 3.41 (t, J = 6.5 Hz, 2H). | ||
| 6-Bromo-hexan-2-oneIn a flame dried round-bottomed flask equipped with a magnetic stir bar and under inert atmosphere (N2), a solution of commercially available 1-methylcyclopentanol (4.00 g, 39.94 mmol) in CHCl3 at 0 C. (2.6 mL) was treated with K2CO3 (33.11 g, 239.62 mmol) and the reaction mixture was stirred for 15 min. Bromine (10.23 mL, 199.68 mmol) was then added and the reaction mixture was stirred at 0 C. for 2.5 h. The reaction mixture was slowly poured onto an ice-chilled sat. aq. Na2S2O3 solution (100 mL). The org. layer was washed with water (2×100 mL), dried over MgSO4, filtered, and the solvent was removed under reduced pressure. Purification of the residue by FC (gradient hept?75:25 hept-EA) gave the title compound as a yellow oil. TLC: rf (75:25 hept-EA)=0.36. 1H NMR (400 MHz, CDCl3) delta 1.66-1.80 (m, 2H), 1.82-1.93 (m, 2H), 2.15 (s, 3H), 2.48 (t, J=7.3 Hz, 2H), 3.41 (t, J=6.5 Hz, 2H). |
| With bromine; potassium carbonate; In chloroform-d1; at 0℃; for 5h; | Step A: 6-bromohexan-2-oneTo a solution of l-methylcyclopentanol (7.0 g, 69.9 mmol) in CHCI3 (200 mL) at 0 C was added K2C03 (58.0 g, 419 mmol) and then carefully Br2 (55.8 g, 349 mmol). The mixture was stirred at 0 C for 5 h. The reaction was quenched by slowly adding saturated a2S203 (200 mL) and the mixture was extracted with Et20 (200 mL). Tthe organic layer was washed with water (2x200 mL) and brine (3x200mL), dried over MgS04, and concentrated to afford the title compound: 1H NMR (500 MHz, CDC13) delta 3.43 (m, 2H)S 2.49 (m, 2H), 2.17 (s, 3H), 1.88 (m, 2H), 1.76 (m, 2H). | |
| 445 mg | With bromine; In dichloromethane; for 6h;Cooling with ice; | 1-Methylcyclopentanol (501 mg, 5.0 mmol) was dissolved in dichloromethane (15 ml), and the mixture was stirred for 10 min, and then bromine (3.995 g, 25.0 mmol) was slowly added and stirred for 6 h under ice bath. After the reaction, the solution was slowly added with saturated sodium thiosulfate solution (20 ml), and then extracted with diethyl ether, water and brine, dried over anhydrous sodium sulfate, filtered and evaporated to dryness. 6-Bromo-2-hexanone (445 mg, 2.49 mmol). |

| Yield | Reaction Conditions | Operation in experiment |
|---|---|---|
| 64% | With toluene-4-sulfonic acid; In toluene; for 3h;Dean-Stark; Inert atmosphere; Reflux; | In a flame dried round-bottomed flask equipped with a magnetic stir bar and a Dean-Stark under N2, a solution of 6-bromo-hexan-2-one (2.0 g, 11.17 mmol), ethylene glycol (6.93 g, 111.7 mmol) and TsOH (384 mg, 0.22 mmol) in toluene (40 mL) was heated to reflux for 3 h. The reaction was allowed to cool to room temperature, and sat. aq. NaHCO3 (60 mL) and ethyl acetate (100 mL.) were added. The organic layer was separated, washed with water (2×100 mL), dried over MgSO4, filtered and concentrated in vacuo. The residue was purified by silica gel column (pet ether:EtOAc 4:1) to give the desired product 2-(4-bromobutyl)-2-methyl-1,3-dioxolane as a colorless oil (1.6 g). Yield 64% (98% purity, UV=214 nm, ESI no found). 1H-NMR (400 MHz, CDCl3) delta 1.34 (s, 3H), 1.50-1.65 (m, 2H), 1.65-1.75 (m, 2H), 1.84-1.98 (m, 2H), 3.43 (t, J=6.8 Hz, 2H), 3.90-4.04 (m, 4H) |
| With toluene-4-sulfonic acid; In toluene; at 25℃;Inert atmosphere; Reflux; | 2-(4-Bromo-butyl)-2-methyl-[1,3]dioxolane: In a flame dried round-bottomed flask equipped with a magnetic stir bar and a Dean-Stark under inert atmosphere (N2), a solution of 6-bromo-hexan-2-one (3.34 g, 18.65 mmol) in toluene (71.3 ml.) was treated with ethylene glycol (10.4 ml_, 186.92 mmol) and TsOH (35 mg, 0.19 mmol). The reaction mixture was heated to reflux for 3 h, allowed to cool to rt and sat. aq. NaHCO3 (100 ml.) and ether (100 ml.) were added and the aq. phase was washed with water (2 x 100 ml_), dried over MgSO4, filtered, and the solvents were removed under reduced pressure to give the title compound. 1H NMR (400 MHz, CDCI3) delta 1.34 (s, 3H), 1.50-1.65 (m, 2H), 1.65-1.75 (m, 2H), 1.84-1.98 (m, 2H), 3.43 (t, J = 6.8 Hz, 2H), 3.90-4.04 (m, 4H). | |
| With toluene-4-sulfonic acid; for 3h;Inert atmosphere; Reflux; | 2-(4-Bromo-butyl)-2-methyl-[1,3]dioxolaneIn a flame dried round-bottomed flask equipped with a magnetic stir bar and a Dean-Stark apparatus under inert atmosphere (N2), a solution of 6-bromo-hexan-2-one (3.34 g, 18.65 mmol) in toluene (71.3 mL) was treated with ethylene glycol (10.4 mL, 186.92 mmol) and TsOH (35 mg, 0.19 mmol). The reaction mixture was heated to reflux for 3 h, allowed to cool to rt and sat. aq. NaHCO3 (100 mL) and ether (100 mL) were added and the aq. phase was washed with water (2×100 mL), dried over MgSO4, filtered, and the solvents were removed under reduced pressure to give the title compound. 1H NMR (400 MHz, CDCl3) delta 1.34 (s, 3H), 1.50-1.65 (m, 2H), 1.65-1.75 (m, 2H), 1.84-1.98 (m, 2H), 3.43 (t, J=6.8 Hz, 2H), 3.90-4.04 (m, 4H). |