Structure of 610794-15-5
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CAS No. : | 610794-15-5 |
Formula : | C9H8BrN |
M.W : | 210.07 |
SMILES Code : | CC1=C(Br)C2=C(NC=C2)C=C1 |
MDL No. : | MFCD11878622 |
InChI Key : | DVCLJDAZHYRZHZ-UHFFFAOYSA-N |
Pubchem ID : | 10488635 |
GHS Pictogram: |
![]() |
Signal Word: | Warning |
Hazard Statements: | H302-H317 |
Precautionary Statements: | P280 |
Num. heavy atoms | 11 |
Num. arom. heavy atoms | 9 |
Fraction Csp3 | 0.11 |
Num. rotatable bonds | 0 |
Num. H-bond acceptors | 0.0 |
Num. H-bond donors | 1.0 |
Molar Refractivity | 50.96 |
TPSA ? Topological Polar Surface Area: Calculated from |
15.79 Ų |
Log Po/w (iLOGP)? iLOGP: in-house physics-based method implemented from |
2.0 |
Log Po/w (XLOGP3)? XLOGP3: Atomistic and knowledge-based method calculated by |
3.1 |
Log Po/w (WLOGP)? WLOGP: Atomistic method implemented from |
3.24 |
Log Po/w (MLOGP)? MLOGP: Topological method implemented from |
2.61 |
Log Po/w (SILICOS-IT)? SILICOS-IT: Hybrid fragmental/topological method calculated by |
3.67 |
Consensus Log Po/w? Consensus Log Po/w: Average of all five predictions |
2.92 |
Log S (ESOL):? ESOL: Topological method implemented from |
-3.7 |
Solubility | 0.0418 mg/ml ; 0.000199 mol/l |
Class? Solubility class: Log S scale |
Soluble |
Log S (Ali)? Ali: Topological method implemented from |
-3.1 |
Solubility | 0.167 mg/ml ; 0.000795 mol/l |
Class? Solubility class: Log S scale |
Soluble |
Log S (SILICOS-IT)? SILICOS-IT: Fragmental method calculated by |
-4.53 |
Solubility | 0.00621 mg/ml ; 0.0000296 mol/l |
Class? Solubility class: Log S scale |
Moderately 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 |
-5.38 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 |
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) |
1.44 |
* 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 |
---|---|---|
20% | With acetic acid; zinc In water at 0 - 110℃; | [2-(2-Bromo-3-methyl-6-nitro-phenyl)-vinyl]-dimethyl-amine (10 g) was dissolved in AcOH /H2O(100mL:25mL), cooled to 0°C and treated with Zn (30 g) added slowly in portions. After complete addition, the reaction mixture was heated at 110°C overnight. The mixture was diluted with water and extracted with EtOAc. The organic layer was dried over Na2S0 and concentrated to give the crude product. The crude product was purified by silica gel column chromatography to afford the title compound (1.4 g, 20 percent) 1H NMR CDCI3400 MHz δ 2.47 (m, 3H), 6.50-6.51 (m, 1H), 6.97-6.99 (m, 1 H), 7.12- 7.18(m, 2H), 8.12 (s, 1 H) |
1.4 g | With acetic acid; zinc In water at 0 - 110℃; | 2-(2-Bromo-3-methyl-6-nitro-phenyl)vinyl]-dimethyl-amine (10 g) was dissolved in AcOH/H2O (100 mL:25 mL), cooled to 0° C. and treated with Zn (30 g) added slowly in portions. After complete addition, the reaction mixture was heated at 110° C. overnight. The mixture was diluted with water and extracted with EtOAc. The organic layer was dried over Na2SO4 and concentrated to give the crude product. The crude product was purified by silica gel column chromatography to afford the title compound (1.4 g, 20percent) 1H NMR CDCl3 400 MHz δ 2.47 (m, 3H), 6.50-6.51 (m, 1H), 6.97-6.99 (m, 1H), 7.12-7.18 (m, 2H), 8.12 (s, 1H) |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
5.5% | Stage #1: With pyrrolidine In 1,4-dioxane at 100℃; for 18 h; Inert atmosphere Stage #2: at 110℃; for 4 h; |
ep 2: A mixture of 298 (3.0 g, 13.04 mmol), pyrrolidine (926 mg, 13.04 mmol), and DMF-DMA (7.76 g, 65.22 mmol) in 1,4-dioxane (20 mL) under nitrogen atmosphere was heated at 100 °C for 18 h. The reaction was concentrated under to dryness in vacuo and to the residue was added iron (3.65 g, 65.22 mmol) and HO Ac (40 mL). The resulting mixture was heated at 110 °C for 4 h, cooled to RT and filtered. The filtrate was concentrated in vacuo. The crude was purified by S1O2 chromatography eluting with petroleum ether/EtOAc (10:1) to afford 150 mg (5.5percent) of 4-bromo-5-methyl-lH-indole (300) as a yellow solid: MS (ESI) m/z = 210.1 (M+l). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
Bredereck's reagent (tert-butoxybis (dimethylamino) methane (16 g, 91 mmol) is added to a solution of 2, 6-dimethyl-3-nitrobromobenzene (20 g, 87 mmol) in anhydrous DMF (120 mL) at room temperature. The reaction mixture is heated at 120-125 C under N2 for 5 hours or until starting material is mostly consumed according to TLC. The reaction mixture is allowed to cool to room temperature, poured into water (300 mL), and extracted with dichloromethane (100 mL * 3). The combined extracts are dried over anhydrous sodium sulfate, filtered, and concentrated to obtain a mixture of enamines as a dark brown oil. This material is used in the next step without purification. The crude mixture is dissolved in acetic ACID/WATER (250 mL of 4: 1), cooled to 0 C and treated with zinc dust (57 g, 870 mmol) added slowly in portions. After complete addition, the reaction mixture is heated at 110 C for 4 hours. Zinc is removed by filtration through a celite pad and the filtrate is extracted with dichloromethane (100 mL * 3). The combined extracts are dried over anhydrous sodium sulfate, concentrated, and purified by flash chromatography on silica gel (EtOAc/Hexane 1: 20) to obtain 4-bromo-5-methylindole as a light purple oil. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
A solution of <strong>[610794-15-5]4-bromo-5-methylindole</strong> (800 mg, 3.8 mmol) in anhydrous ether (8 ML) is added with stirring to a suspension of potassium hydride (560 mg, 4.2 mmol, 30% dispersion in mineral oil) in anhydrous ether at 0 C under argon. The resulting mixture is cooled to-78 C and TERT-BUTYLLITHIUM (4.9 ML of 1.7 M in pentane, 8.4 mmol) is slowly added. The resulting cream-colored mixture is stirred at-78C for 1 hour. Tributylborate (3.1 mL, 11.4 mmol) is slowly added and the reaction mixture is stirred for 1 hour at-78C before being allowed to slowly warm to room temperature. More anhydrous ether is added to facilitate stirring. After stirring for 24 hours, the resulting sticky mixture is diluted with ether and transferred in portions with stirring to a precooled solution of 1 M phosphoric acid (50 mL). After stirring for 30 minutes, the acidic mixture is extracted with diethyl ether (75 mL * 3) and the combined extracts are extracted with 1 N sodium hydroxide (20 mL * 4). The combined base extracts are cooled with an ice bath, acidified with 1 M phosphoric acid and extracted with ethyl acetate (20 mL * 3). The combined extracts are washed with brine (20 mL), dried over anhydrous sodium sulfate, filtered and concentrated to obtain a beige residue. The residue is triturated with hexane to obtain the desired 5-methylindole-4-boronic acid as a beige gum (230 mg). | ||
To a suspension of potassium hydride (143 mg, 1.07 mmol) in anhydrous diethyl ether (2 mL) at 0 0C is added a solution of <strong>[610794-15-5]4-bromo-5-methylindole</strong> (186 mg, 0.89 mmol) in diethyl ether (2 mL). The reaction mixture is cooled to -78 0C prior to dropwise addition of tert-butyllithium (1.56 mL of a 1.7 M solution in hexane, 2.7 mmol). The resulting mixture is stirred for 40 min prior to slow addition of tributylborate (980 muL, 3.54 mmol) and the reaction mixture is allowed to slowly warm to ambient temperature. After stirring for 18 h the reaction is quenched by the addition of phosphoric acid (IM) and extraction with diethyl ether. The organic layer is back-extracted with aqueous sodium hydroxide (IM) and the resulting aqueous layer is acidified with phosphoric acid (IM) and extracted with ethyl acetate. The organic layer was washed with brine, dried (MgSO4), filtered and concentrated in vacuo. Trituration with hexane affords the desired 5- methylindole-4-boronic acid as a beige gum. | ||
A solution of <strong>[610794-15-5]4-bromo-5-methylindole</strong> (800 mg, 3.8 mmol) in anhydrous ether (8 mL) is added with stirring to a suspension of potassium hydride (560 mg, 4.2 mmol, 30% dispersion in mineral oil) in anhydrous ether at 0 C under argon. The resulting mixture is cooled to -78 C and rert-butyllithium (4.9 mL of 1.7 M in pentane, 8.4 mmol) is slowly added. The resulting cream-colored mixture is stirred at -78 C for 1 h. Tributylborate (3.1 mL, 11.4 mmol) is slowly added and the reaction mixture is stirred for 1 h at -78 C before being allowed to slowly warm to room temperature. More anhydrous ether is added to facilitate stirring. After stirring for 24 h, the resulting sticky mixture is diluted with ether and transferred in portions with stirring to a precooled solution of 1 M phosphoric acid (50 mL). After stirring for 30 min, the acidic mixture is extracted with diethyl ether (75 mL x 3) and the combined extracts are extracted with 1 N sodium hydroxide (20 mL x 4). The combined base extracts are cooled with an ice bath, acidified with 1 M phosphoric acid and extracted with EtOAc (20 mL x 3). The combined extracts are washed with brine (20 mL), dried over anhydrous sodium sulfate, filtered and concentrated to obtain a beige residue. The residue is triturated with hexane to obtain the desired 5-methylindole-4-boronic acid as a beige gum. |
A solution of <strong>[610794-15-5]4-bromo-5-methylindole</strong> (800 mg, 3.8 mmol) in anhydrous ether (8 mL) is added with stirring to a suspension of potassium hydride (560 mg, 4.2 mmol, 30% dispersion in mineral oil) in anhydrous ether at 0 C under argon. The resulting mixture is cooled to-78 C and tert-butyllithium (4.9 mL of 1.7 M in pentane, 8.4 mmol) is slowly added. The resulting cream- colored mixture is stirred at-78 C for 1 hour. Tributylborate (3.1 mL, 11.4 mmol) is slowly added and the reaction mixture is stirred for 1 hour at-78 C before being allowed to slowly warm to room temperature. More anhydrous ether is added to facilitate stirring. After stirring for 24 h, the resulting sticky mixture is diluted with ether and transferred in portions with stirring to a precooled solution of 1 M phosphoric acid (50 mL). After stirring for 30 min, the acidic mixture is extracted with diethyl ether (75 mL x 3) and the combined extracts are extracted with 1 N sodium hydroxide (20 mL x 4). The combined base extracts are cooled with an ice bath, acidified with 1 M phosphoric acid and extracted with EtOAc (20 mL x 3). The combined extracts are washed with brine (20 mL), dried over anhydrous sodium sulfate, filtered and concentrated to obtain a beige residue. The residue is triturated with hexane to obtain the desired 5-methylindole-4-boronic acid as a beige gum. | ||
Fuming nitric acid (>90% yellow fuming HN03) is slowly added to a solution of 2-bromo-m-xylene (20 g, 150 mmol) in acetic acid (100 mL) cooled in an ice bath (above freezing point). The resulting mixture is allowed to warm to room temperature, stirred for 1 h, and heated at 80 C for 2 h or until the reaction is complete by GC/MS analysis following micro-scale base work-up. The reaction mixture is cooled to room temperature and poured into ice/water with stirring. The resulting yellow precipitates are collected by suction filtration and air dried to obtain 2,6-dimethyl-3-nitrobromobenzene. Bredereck's reagent (tert-butoxybis(dimethylamino)methane (16 g, 91 mmol) is added to a solution of 2,6-dimethyl-3-nitrobromobenzene (20 g, 87 mmol) in anhydrous DMF (120 mL) at room temperature. The reaction mixture is heated at 120-125 C under N2 for 5 h or until starting material is mostly consumed according to TLC. The reaction mixture is allowed to cool to room temperature, poured into water (300 mL), and extracted with dichloromethane (100 mL x 3). The combined extracts are dried over anhydrous sodium sulfate, filtered, and concentrated to obtain a mixture of enamines as a dark brown oil. This material is used in the next step without purification. The crude mixture is dissolved in acetic acid/water (250 mL of 4 : 1), cooled to 0 C and treated with zinc dust (57 g, 870 mmol) added slowly in portions. After complete addition, the reaction mixture is heated at 110 C for 4 h. Zinc is removed by filtration through a celite pad and the filtrate is extracted with dichloromethane (100 mL x 3). The combined extracts are dried over anhydrous sodium sulfate, concentrated, and purified by flash chromatography on silica gel (EtOAc/Hexane 1:20) to obtain <strong>[610794-15-5]4-bromo-5-methylindole</strong> as a light purple oil. A solution of <strong>[610794-15-5]4-bromo-5-methylindole</strong> (800 mg, 3.8 mmol) in anhydrous ether (8 mL) is added with stirring to a suspension of potassium hydride (560 mg, 4.2 mmol, 30% dispersion in mineral oil) in anhydrous ether at 0 C under argon. The resulting mixture is cooled to-78 C and tert-butyllithium (4.9 mL of 1.7 M in pentane, 8.4 mmol) is slowly added. The resulting cream- colored mixture is stirred at -78 C for 1 h. Tributylborate (3.1 mL, 11.4 mmol) is slowly added and the reaction mixture is stirred for 1 h at -78 C before being allowed to slowly warm to room temperature. More anhydrous ether is added to facilitate stirring. After stirring for 24 h, the resulting sticky mixture is diluted with ether and transferred in portions with stirring to a precooled solution of 1 M phosphoric acid (50 mL). After stirring for 30 min, the acidic mixture is extracted with diethyl ether (75 mL x 3) and the combined extracts are extracted with 1 N sodium hydroxide (20 mL x 4). The combined base extracts are cooled with an ice bath, acidified with 1 M phosphoric acid and extracted with ethyl acetate (20 mL x 3). The combined extracts are washed with brine (20 mL), dried over anhydrous sodium sulfate, filtered and concentrated to obtain a beige residue. The residue is triturated with hexane to obtain the desired 5-methylindole-4-boronic acid as a beige gum. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
To 2,6-dimethyl-3-nitrobromobenzene (2.31 g, 10.0 mmol) in anhydrous DMF (15 mL) is added Bredereck's reagent (tert-butoxybis(dimethylamino)methane) (4.35 mL, 21.1 mmol) and the resultant solution is heated at 125 0C for 5h. Upon cooling to ambient temperature, the reaction mixture is diluted with water and extracted with methylene chloride. The organic layer is isolated, dried (Na2SO4), filtered and concentrated in vacuo to give a dark brown oil. The crude mixture is dissolved in acetic acid/water (12 mL of 4:1) and <n="63"/>cooled to 0 C prior to portion-wise addition of zinc dust (6.56 g, 100.4 mmol) over 2 h. On completion of the addition the reaction mixture is stirred at ambient temperature for 1 h prior to heating at 110 0C for 2 h. The resultant reaction mixture is passed through a pad of Celite eluting with methylene chloride. The filtrate was extracted with methylene chloride and the organic layer is isolated, dried (Na2SO4), filtered and concentrated in vacuo. The crude product is purified by silica gel column chromatography eluting with ethyl acetate/heptane to give 4-bromo-5-niethylindole as a dark brown oil which solidified on standing. | ||
STEP A. SYNTHESIS OF 4-BROMO-5-METHYLINDOLE Fuming nitric acid (>90% yellow fuming HNO3) is slowly added to a solution of 2- bromo-m-xylene (20 g, 150 mmol) in acetic acid (100 ml) cooled in an ice bath (above freezing point). The resulting mixture is allowed to warm to room temperature, stirred for 1 hour, and heated at 80C for 2 hours or until the reaction is shown to be complete by GC/MS analysis following micro-scale base work-up. The reaction mixture is cooled to room temperature and poured into ice/water with stirring. The resulting yellow precipitates are collected by suction filtration and air dried to obtain 2,6-dimethyl-3-nitrobromobenzene. Bredereck's reagent (tert-butoxybis (dimethylamino) methane-16 g, 91 mmol) is added at room temperature to a solution of 2,6-dimethyl-3-nitrobromobenzene (20 g, 87 mmol) in anhydrous DMF (120 ml). The reaction mixture is heated at 120-125 C under N2 for 5 hours or until starting material is mostly consumed according to TLC. The reaction mixture is allowed to cool to room temperature, poured into water (300 ml), and extracted with dichloromethane (100 ml x 3). The combined extracts are dried over anhydrous sodium sulfate, filtered, and concentrated to obtain a mixture of enamines as a dark brown oil. This material is carried on to the next step without purification. The crude mixture is dissolved in acetic acid/water (250 ml of 4: 1), cooled to 0C and treated with zinc dust (57 g, 870 mmol) added slowly in portions. After complete addition, the reaction mixture is heated at 110 C for 4h. Zinc is removed by filtration through a celite pad and the filtrate is extracted with dichloromethane (100 ml x 3). The combined extracts are dried over anhydrous sodium sulfate, concentrated and purified by flash chromatography on silica gel (EtOAc/Hexane 1: 20) to obtain 4-bromo-5-methylindole (5.3 g) (21) as a light purple oil. | ||
Fuming nitric acid (>90% yellow fuming HN03) is slowly added to a solution of 2-bromo-m-xylene (20 g, 150 mmol) in acetic acid (100 mL) cooled in an ice bath (above freezing point). The resulting mixture is allowed to warm to room temperature, stirred for 1 h, and heated at 80 C for 2 h or until the reaction is complete by GC/MS analysis following micro-scale base work-up. The reaction mixture is cooled to room temperature and poured into ice/water with stirring. The resulting yellow precipitates are collected by suction filtration and air dried to obtain 2,6-dimethyl-3-nitrobromobenzene. Bredereck's reagent (tert-butoxybis(dimethylamino)methane (16 g, 91 mmol) is added to a solution of 2,6-dimethyl-3-nitrobromobenzene (20 g, 87 mmol) in anhydrous DMF (120 mL) at room temperature. The reaction mixture is heated at 120-125 C under N2 for 5 h or until starting material is mostly consumed according to TLC. The reaction mixture is allowed to cool to room temperature, poured into water (300 mL), and extracted with dichloromethane (100 mL x 3). The combined extracts are dried over anhydrous sodium sulfate, filtered, and concentrated to obtain a mixture of enamines as a dark brown oil. This material is used in the next step without purification. The crude mixture is dissolved in acetic acid/water (250 mL of 4 : 1), cooled to 0 C and treated with zinc dust (57 g, 870 mmol) added slowly in portions. After complete addition, the reaction mixture is heated at 110 C for 4 h. Zinc is removed by filtration through a celite pad and the filtrate is extracted with dichloromethane (100 mL x 3). The combined extracts are dried over anhydrous sodium sulfate, concentrated, and purified by flash chromatography on silica gel (EtOAc/Hexane 1:20) to obtain 4-bromo-5-methylindole as a light purple oil. A solution of 4-bromo-5-methylindole (800 mg, 3.8 mmol) in anhydrous ether (8 mL) is added with stirring to a suspension of potassium hydride (560 mg, 4.2 mmol, 30% dispersion in mineral oil) in anhydrous ether at 0 C under argon. The resulting mixture is cooled to-78 C and tert-butyllithium (4.9 mL of 1.7 M in pentane, 8.4 mmol) is slowly added. The resulting cream- colored mixture is stirred at -78 C for 1 h. Tributylborate (3.1 mL, 11.4 mmol) is slowly added and the reaction mixture is stirred for 1 h at -78 C before being allowed to slowly warm to room temperature. More anhydrous ether is added to facilitate stirring. After stirring for 24 h, the resulting sticky mixture is diluted with ether and transferred in portions with stirring to a precooled solution of 1 M phosphoric acid (50 mL). After stirring for 30 min, the acidic mixture is extracted with diethyl ether (75 mL x 3) and the combined extracts are extracted with 1 N sodium hydroxide (20 mL x 4). The combined base extracts are cooled with an ice bath, acidified with 1 M phosphoric acid and extracted with ethyl acetate (20 mL x 3). The combined extracts are washed with brine (20 mL), dried over anhydrous sodium sulfate, filtered and concentrated to obtain a beige residue. The residue is triturated with hexane to obtain the desired 5-methylindole-4-boronic acid as a beige gum. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With acetic acid; zinc; In water; at 0 - 110℃; for 4h; | Bredereck's reagent (tert-butoxybis(dimethylamino)methane (16 g, 91 mmol) is added to1 a solution of 2,6-dimethyl-3-nitrobromobenzene (20 g, 87 mmol) in anhydrous DMF (120 mL) at room temperature. The reaction mixture is heated at 120-125 C under N2 for 5 h or until starting material is mostly consumed according to TLC. The reaction mixture is allowed to cool to room temperature, poured into water (300 mL), and extracted with dichloromethane (100 mL x 3). The combined extracts are dried over anhydrous sodium sulfate, filtered, and concentrated to obtain a mixture of enamines as a dark brown oil. This material is used in the next step without purification.The crude mixture is dissolved in acetic acid/water (250 mL of 4:1), cooled to 0 C and treated with zinc dust (57 g, 870 mmol) added slowly in portions. After complete addition, the reaction mixture is heated at 110 C for 4 h. Zinc is removed by filtration through a celite pad and the filtrate is extracted with dichloromethane (100 mL x 3). The combined extracts are dried over anhydrous sodium sulfate, concentrated, and purified by flash chromatography on silica gel (EtOAc/Hexane 1:20) to obtain 4-bromo-5-methylindole as a light purple oil. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With acetic acid; zinc; In water; at 0 - 110℃; for 4h; | B. 5-Methy.-4-bromo indole; EPO <DP n="45"/>The crude mixture from examp,e 21 A was dissolved in acetic acid/water (250 mL, 4/1), cooled to 0 0C and treated with zinc dust (5.7 g, 87 mmol) added in small portions. After the addition, the reaction mixture was heated at 110 0C for 4 h. Zinc was removed through a pad of celite and the filtrate was extracted in dichloromethane (100 ml X 3). The combined extracts were dried over sodium sulfate, concentrated and puried by column chromatography using 10% ethyl acetate/methanol. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
20% | With acetic acid; zinc; In water; at 0 - 110℃; | [2-(2-Bromo-3-methyl-6-nitro-phenyl)-vinyl]-dimethyl-amine (10 g) was dissolved in AcOH /H2O(100mL:25mL), cooled to 0C and treated with Zn (30 g) added slowly in portions. After complete addition, the reaction mixture was heated at 110C overnight. The mixture was diluted with water and extracted with EtOAc. The organic layer was dried over Na2S0 and concentrated to give the crude product. The crude product was purified by silica gel column chromatography to afford the title compound (1.4 g, 20 %) 1H NMR CDCI3400 MHz delta 2.47 (m, 3H), 6.50-6.51 (m, 1H), 6.97-6.99 (m, 1 H), 7.12- 7.18(m, 2H), 8.12 (s, 1 H) |
1.4 g | With acetic acid; zinc; In water; at 0 - 110℃; | 2-(2-Bromo-3-methyl-6-nitro-phenyl)vinyl]-dimethyl-amine (10 g) was dissolved in AcOH/H2O (100 mL:25 mL), cooled to 0 C. and treated with Zn (30 g) added slowly in portions. After complete addition, the reaction mixture was heated at 110 C. overnight. The mixture was diluted with water and extracted with EtOAc. The organic layer was dried over Na2SO4 and concentrated to give the crude product. The crude product was purified by silica gel column chromatography to afford the title compound (1.4 g, 20%) 1H NMR CDCl3 400 MHz delta 2.47 (m, 3H), 6.50-6.51 (m, 1H), 6.97-6.99 (m, 1H), 7.12-7.18 (m, 2H), 8.12 (s, 1H) |
With acetic anhydride; zinc; In water; at 110℃; for 4h; | A solution of 4-bromo-5-methylindole (800 mg, 3.8 mmol) in anhydrous ether (8 mL) is added with stirring to a suspension of potassium hydride (560 mg, 4.2 mmol, 30% dispersion in mineral oil) in anhydrous ether at 0 C under argon. The resulting mixture is cooled to-78 C and tert-butyllithium (4.9 mL of 1.7 M in pentane, 8.4 mmol) is slowly added. The resulting cream- colored mixture is stirred at-78 C for 1 hour. Tributylborate (3.1 mL, 11.4 mmol) is slowly added and the reaction mixture is stirred for 1 hour at-78 C before being allowed to slowly warm to room temperature. More anhydrous ether is added to facilitate stirring. After stirring for 24 h, the resulting sticky mixture is diluted with ether and transferred in portions with stirring to a precooled solution of 1 M phosphoric acid (50 mL). After stirring for 30 min, the acidic mixture is extracted with diethyl ether (75 mL x 3) and the combined extracts are extracted with 1 N sodium hydroxide (20 mL x 4). The combined base extracts are cooled with an ice bath, acidified with 1 M phosphoric acid and extracted with EtOAc (20 mL x 3). The combined extracts are washed with brine (20 mL), dried over anhydrous sodium sulfate, filtered and concentrated to obtain a beige residue. The residue is triturated with hexane to obtain the desired 5-methylindole-4-boronic acid as a beige gum. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
92% | NaH (60% in oil, 81.4 mg, 3.39 mmol) is added to a RT solution of 4-bromo-5-methyl-1 H-indole (500 mg,2.26 mmol) in DMF (5 mL). It is stirred at RT for 20 min and iodomethane (0.156 mL, 2.49 mmol) is added. The RM is stirred at RT for 3h. Water is added, and the mixture is extracted twice with EtOAc. Combined organic layers are washed with brine, dried (MgSCXi), filtered and concentrated under reduced pressure. The residue is purified by FC (heptane:EtOAc, 1 :0 to 7:3), affording the title compound as a beige solid (464 mg, 92%). LC-MS B: tR = 1.02 min; [M+H]+ = 226.2. | |
STEP B. PREPARATION OF 4-BROMO-1, 5-DIMETHYL-lH-INDOLE A solution of <strong>[610794-15-5]4-bromo-5-methylindole</strong> (3.55g, 16. 9mmol) (21) in 10 ml of anhydrous DMF is added to a suspension of sodium hydride (l. Olg, 60% in mineral oil, 25.3 mmol, 1.5 eq. ) in 10 ml of DMF under nitrogen at 0C. The resulting mixture is stirred at 0C for 30 minutes, and then warmed to room temperature. After stirring at room temperature for an additional 2 hours, the reaction mixture is cooled to 0C. Iodomethane (2.40g, 18.6mmol, 1.1 eq. ) is added dropwise, the mixture is stirred at 0C for 2 hours, and then is warmed to 50C and stirred for an additional 2 hours. The reaction mixture is poured into 100ml of ice-water, extracted with ethyl acetate (30 ml x 3), washed with water and brine dried over anhydrous sodium sulfate. The solvent is evaporated and the product (22) is taken to dryness under high vacuum to give 3.75g of pure compound.'H NMR (400 MHz, CDC13) 8 7.17 (1H, d, J = 8.4 Hz), 7.08 (1H, d, J = 8.4 Hz), 7.05 (1H, 4, J = 3.2 Hz), 650 (1H, dd, J = 0.4, 2.8 Hz), 3.77 (3H, 3), 2.51 (3H, s); MS (+VE) m/z 224 (M+). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
48.5% | With 1,1'-bis-(diphenylphosphino)ferrocene; tris-(dibenzylideneacetone)dipalladium(0); zinc; In 1-methyl-pyrrolidin-2-one; at 145℃; for 18h; | step 3: A mixture of 300 (150 mg, 0.714 mmol), Pd2(dba)3 (131 mg, 0.143 mmol), dppf (159 mg, 0.286 mmol), Zn(CN)2 (84 mg, 0.714 mmol), and zinc (4.6 mg, 0.0714 mmol) in NMP (10 mL) under nitrogen atmosphere was heated at 145 C for 18 h. The reaction mixture was poured into water (50 mL) and extracted with EtOAc (20 mL x 3). The combined extracts were dried (MgS04), filtered, and concentrated to dryness. The crude was purified by S1O2 chromatography eluting with petroleum ether/EtOAc (3:1) to afford54 mg (48.5%) 5-methyl-lH-indole-4-carbonitrile (302) as yellow solid: MS (ESI) m/z = 157.1 (M+l). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
5.5% | ep 2: A mixture of 298 (3.0 g, 13.04 mmol), pyrrolidine (926 mg, 13.04 mmol), and DMF-DMA (7.76 g, 65.22 mmol) in 1,4-dioxane (20 mL) under nitrogen atmosphere was heated at 100 C for 18 h. The reaction was concentrated under to dryness in vacuo and to the residue was added iron (3.65 g, 65.22 mmol) and HO Ac (40 mL). The resulting mixture was heated at 110 C for 4 h, cooled to RT and filtered. The filtrate was concentrated in vacuo. The crude was purified by S1O2 chromatography eluting with petroleum ether/EtOAc (10:1) to afford 150 mg (5.5%) of 4-bromo-5-methyl-lH-indole (300) as a yellow solid: MS (ESI) m/z = 210.1 (M+l). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
43% | With dichloro(1,1'-bis(diphenylphosphanyl)ferrocene)palladium(II)*CH2Cl2; potassium acetate; at 90℃; for 2.5h;Inert atmosphere; | A solution of <strong>[610794-15-5]4-bromo-5-methylindole</strong> (805 mg, 3.64 mmol, 1.0 eq) in degassed1,4-dioxane (10 mL) was degassed with argon for a further 5 mm before the addition of bis(pinacolato)diboron (1 .20 g, 4.73 mmol, 1 .3 eq). Whilst degassing,potassium acetate (1.07 g, 10.9 mmol, 3.0 eq) and PdCI2(dppf)CH2CI2 (149 mg,0.182 mmol, 5 mol%) were added. The vessel was then sealed and stirred at90C for 2.5 h. Upon cooling, the reaction mixture was diluted with H20 (10 mL),poured into 50% brine (50 mL) and extracted with EtOAc (3 x 50 mL). Thecombined organic extracts were dried over MgSO4, filtered and concentrated invacuo. Purification twice by silica gel column chromatography with hexane/EtOAc (1 :0-14:1) then hexane/CH2CI2 (1:0-1:1) yielded Intermediate 38 as a white solid (400 mg, 43%).1H NMR (300MHz, ODd3) oH. 8.05 (br 5, 1H), 7.34 (d, J=8.3 Hz, 1H), 7.20 (t,J=2.7 Hz, 1H), 7.03 (d, J=8.3 Hz, 1H), 6.98 (td, J=2.0, 1.0 Hz, 1H), 2.64 (5, 3H),1.42 (5, 12H).MS (ESj 258.2 (100%, [M+H]j, 280.1 (40%, [M+Na]j. |
33% | With (1,1'-bis(diphenylphosphino)ferrocene)palladium(II) dichloride; potassium acetate; In dimethyl sulfoxide; at 180℃; for 0.666667h;Microwave irradiation; | 4-Bromo-5-methylindole (0.7 g, 3.35 mmol), bis(pinacolato)diboron (1.7 g, 6.7 mmol), KOAc (1 g, 10 mmol) and Pd(dppf)CI2 (73 mg, 3 mol%) were suspended in dry DMSO (20 mL) in two 40 mL glass tubes which were tightly sealed with an aluminium/Teflon crimp. The samples were irradiated at 250 W, 180 C for 40 min in a CEM-Discover mono-mode microwave reactor. After completion of the reactions, the vessels were cooled down to 60C, combined and the crude mixture was filtered through a thin plug of celite. The celite plug was washed with EtOAc (50 mL), the organic fractions were combined and the solvent was removed under reduced pressure. The crude product was purified by silica gel column chromatography and then prep-HPLC to give 5 (280mg, 33 %). 1H NMR CDCI3400 MuEtazeta delta 1.41 (s, 12H), 2.63 (s, 3H), 6.96-6.97 (m, 1 H), 7.01-7.03 (m, 1 H), 7.18-7.20(m, 1 H), 7.32-7.34 (m, 1 H), 8.13 (s, 1 H) |
33% | With (1,1'-bis(diphenylphosphino)ferrocene)palladium(II) dichloride; potassium acetate; In dimethyl sulfoxide; at 180℃; for 0.666667h;Sealed tube; Microwave irradiation; | 4-Bromo-5-methylindole (0.7 g, 3.35 mmol), bis(pinacolato)diboron (1.7 g, 6.7 mmol), KOAc (1 g, 10 mmol) and Pd(dppf)Cl2 (73 mg, 3 mol %) were suspended in dry DMSO (20 mL) in two 40 mL glass tubes which were tightly sealed with an aluminium/Teflon crimp. The samples were irradiated at 250 W, 180 C. for 40 min in a CEM-Discover mono-mode microwave reactor. After completion of the reactions, the vessels were cooled down to 60 C., combined and the crude mixture was filtered through a thin plug of celite. The celite plug was washed with EtOAc (50 mL), the organic fractions were combined and the solvent was removed under reduced pressure. The crude product was purified by silica gel column chromatography and then prep-HPLC to give 5 (280 mg, 33%). 1H NMR CDCl3400 MHz delta 1.41 (s, 12H), 2.63 (s, 3H), 6.96-6.97 (m, 1H), 7.01-7.03 (m, 1H), 7.18-7.20 (m, 1H), 7.32-7.34 (m, 1H), 8.13 (s, 1H) |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
91.8% | With (1,1'-bis(diphenylphosphino)ferrocene)palladium(II) dichloride; potassium carbonate; In 1,4-dioxane; at 90℃; for 5h;Inert atmosphere; | A mixture of bromide 1 (1.0 g, 4.78 mmol), methyl boronic acid (860 mg, 14.3 mmol), Pd(dppf)2Cl2 (194 mg, 0.239 mmol), and K2CO3 (1.32 g, 9.56 mmol) in dioxane (20 mL) was degassed and stirred at 90 C. for 5 h under nitrogen. The reaction mixture was concentrated, and the residue was purified by silica gel chromatography (EtOAc/petroleum ether=1/4) to give the desired product (636 mg, 4.39 mmol, 91.8%) as a white solid. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
56.4% | With quinoline; copper; at 250℃; for 2h;Inert atmosphere; Reflux; | A mixture of carboxylic acid 4 (1.58 g, 6.24 mmol), copper powder (280 mg, 4.37 mmol, 0.7 eq.) and quinoline (10 mL) was refluxed at 250 C. for 2 h under N2. The mixture was then cooled and poured into ice-water. The solution was brought to pH 4 with concentrated HCl and extracted with EtOAc. The combined extracts were washed with HCl (2 M), saturated NaHCO3 and brine, dried over Na2SO4 and concentrated. The residue was purified by silica gel chromatography (petroleum ether/EtOAc=5/1) to give the desired product (736 mg, 3.52 mmol, 56.4%) as a gray solid. To avoid side reactions at high temperature, the reaction was carried out under inert atmosphere |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
63% | A solution of <strong>[610794-15-5]4-bromo-5-methyl-1H-indole</strong> (100 mg, 0.476 mmol) in dry THF (2 mL) under nitrogen was cooled with stirring in an ice-salt bath. Sodium hydride (23 mg 60% in oil, 0.57 mg, 1.2 eq.) was added and the mixture was stirred for 30 min at -5° C., then 1 h at room temperature (gas evolution ceased). Chlorotriisopropylsilane (0.10 mL, 0.48 mmol, 1 eq.) was next added and the reaction mixture was stirred at r.t. for 2 hours. The reaction was divided between EtOAc (15 mL) and water (10 mL) and the layers separated. The organic layer was washed with water (5 mL), brine (5 mL), dried over Na 2SO 4 and evaporated in vacuo. The residue was purified on silica gel using hexanes as eluent to give product. (107 mg, 63%). |
Tags: 610794-15-5 synthesis path| 610794-15-5 SDS| 610794-15-5 COA| 610794-15-5 purity| 610794-15-5 application| 610794-15-5 NMR| 610794-15-5 COA| 610794-15-5 structure
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