Structure of 22876-16-0
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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. : | 22876-16-0 |
Formula : | C8H7NO2 |
M.W : | 149.15 |
SMILES Code : | O=C1OC2=CC(C)=CC=C2N1 |
MDL No. : | MFCD02090051 |
InChI Key : | SAQACWOVZKNHSB-UHFFFAOYSA-N |
Pubchem ID : | 322634 |
GHS Pictogram: |
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Signal Word: | Warning |
Hazard Statements: | H315-H319 |
Precautionary Statements: | P264-P280-P302+P352-P305+P351+P338-P332+P313-P337+P313-P362 |
* 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 |
---|---|---|
90% | In acetonitrile; at 23 - 70℃; | To a solution of 2-amino-5-methylphenol (777 mg, 6.32 mmol) in acetonitrile (27 mL) at 23 C. was added 1,1'-carbonyldiimidazole (3.07 g, 18.9 mmol) and the reaction mixture was heated to 70 C., and stirred overnight. The reaction mixture was cooled to room temperature and partitioned between ethyl acetate (150 mL) and H2O (100 mL). The organic layer was separated and washed with brine (100 mL), dried (MgSO4) and concentrated to yield the crude product which was purified by silica gel column chromatography (20-50% EtOAc in hexanes) to yield 6-methyl-3H-benzooxazol-2-one (853 mg, 90%). |
In dichloromethane; at 20℃; for 24h;Inert atmosphere; | General procedure: To a solution of the corresponding 2-amino phenol (1 equiv.) in dry dichloromethane was added 1,1’,-dicarbonyldiimidazole (1.1 equiv) and stirred at ambient temperature under a nitrogen atmosphere for 24 h. The reaction mixture was quenched with water and extracted with ethyl acetate (3x). The organic layer was washed with brine, dried over sodium sulfate, filtered and concentrated in vacuo. The benzoxazolone residue was purified by silica gel chromatography. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
73% | With cesium fluoride; In diethylene glycol dimethyl ether; at 100℃; for 20h;Glovebox; Schlenk technique; | General procedure: In a glove box, add o-phenylenediamine (1mmol), CsF (2mol), and diglyme (3mL) to a 10ml Schlenk bottle, and replace the air with CO2; connect the Schlenk bottle with a CO2 balloon, and then PMHS (4.5 mmol) was poured into a reaction bottle using a syringe, and the mixture was placed in an oil bath and stirred at 100 C for 20 hours. After the reaction was completed, the temperature was lowered to room temperature, and then poured into 30 mL of H2O to immediately obtain a large amount of precipitate. Then, a large amount of solid powder was obtained by suction filtration. The solid powder was washed with n-hexane (3 × 5 mL) to remove unreacted raw materials, and then ethyl acetate (3 × 10 mL) Wash the solid powder. The ethyl acetate layer was collected, dried over anhydrous magnesium sulfate, and then subjected to vacuum rotary evaporation to obtain a pure product with an isolated yield of 95%. |
3.38 6-Methyl-3H-benzooxazol-2-one (86KK20c) 2-Hydroxy-4-methylanilin (0.145 g, 1.17 mmol) and carbonyldiimidazole (0.250 g, 1.54 mmol) were reacted according to GP6 to give the crude title compound (86KK20d). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With NaH; In chlorhydrate de methyl-5 orthoaminophenol-1,2; N,N-dimethyl-formamide; mineral oil; | EXAMPLE 5 8-(6-Methyl-2-oxo-benzoxazolin-3-yl)-caprylic acid methyl ester The product is produced as described in example 1 from 3.6 g. of NaH (of 80% suspension in mineral oil), 19.9 g. of <strong>[22876-16-0]6-methylbenzoxazolin-2-one</strong> (produced in usual manners by subjecting 2-amino-5-methyl-phenol-hydrochloride to reaction with phosgene), 240 cc. of DMF, 28.4 g. of 8-bromo caprylic acid methyl ester and 3.6 g. NaJ. Yield: 31.1 g. (oil). IR (film): 1780 and 1740 cm-1. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With potassium carbonate; In N,N-dimethyl-formamide; at 45℃;Inert atmosphere; | To a solution of <strong>[22876-16-0]6-methylbenzo[d]oxazol-2(3H)-one</strong> (300 mg, 1.98 mmol) and K2CO3 (668 mg, 4.95 mmol) in DMF was added benzyl bromide (375 mg, 2.1 mmol) at 45 0C and the reaction was stirred under nitrogen atmosphere for 5 h. The reaction mixture was poured into ice water and the precipitate was filtered, washed with n-hexane and dried under vacuum to give compound 2 (250 mg, 50%) as a white solid. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
83% | With triethylamine; In tetrahydrofuran; at 0 - 20℃; | A solution of triphosgene (1.93g, 6.5mmol) in anhydrous THF (40mL) was added to a solution of 2-amino-5-methylphenol (10g, 8.1mmol) and Et3N (2.3mL) in anhydrous THF (40mL) at 0C. The resulting solution was stirred at room temperature (RT) for overnight and was diluted with water (10mL). After 30min, the reaction mixture was concentrated in vacuo and the residue was extracted with ethyl acetate (50mL×3). The combined organic layer was washed by saturated sodium chloride solution for three times, dried over anhydrous Na2SO4 and concentrated under reduced pressure to afford 6-methylbenzo[d]oxazol-2(3H)-one as an off-white solid. Yield 83% (1.93g). MS (ESI): 150.1 [M+H]+ |
With N-ethyl-N,N-diisopropylamine; In dichloromethane; at 0℃;Inert atmosphere; | Synthesis of 3-benzyl-6-methyl-3H-benzooxazol-2-one (2)A solution of 2-amino-5-methyl-phenol (1.0 gm, 8.1 mmol) in CH2Cl2 (30 ml) was cooled to 0 0C. Triphosgene (721 mg, 2.43 mmol) was added followed by diisopropylethylamine (7.0 ml, 17.6 mmol) and the reaction mixture was stirred under nitrogen atmosphere for 2 h. The reaction mixture was washed with water and brine. The organic phase was dried over anhydrous MgSO4 and evaporated under vacuum. The crude product 6- methylbenzo[d]oxazol-2(3H)-one was used for the next step without any purification. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
57% | To a portion of <strong>[22876-16-0]6-methyl-3H-benzooxazol-2-one</strong> (450 mg, 3.02 mmol) in DMF (10 mL) at 23 C. was added K2CO3 (900 mg, 6.51 mmol), and the reaction mixture was stirred for 30 min. Benzyl-2-bromoacetate (909 μL, 5.74 mmol) was slowly added to the reaction mixture, while stirring. After 17 h, the reaction mixture was diluted with ethyl acetate (100 mL) and washed with 1.0 N HCl (100 mL), saturate aqueous NaHCO3 (100 mL), then brine (100 mL), and then was dried (Na2SO4) and concentrated to yield the crude product that was purified by silica gel column chromatography (20-50% EtOAc in hexanes) to afford (6-methyl-2-oxobenzooxazol-3-yl)acetic acid benzyl ester (512 mg, 57%). |
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