Structure of 6625-94-1
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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. : | 6625-94-1 |
Formula : | C8H3Cl3N2 |
M.W : | 233.48 |
SMILES Code : | ClC1=CC2=NC(Cl)=NC(Cl)=C2C=C1 |
MDL No. : | MFCD09954887 |
InChI Key : | MFVNIGBXSLGABC-UHFFFAOYSA-N |
Pubchem ID : | 246037 |
GHS Pictogram: |
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Signal Word: | Warning |
Hazard Statements: | H315-H319-H335 |
Precautionary Statements: | P261-P305+P351+P338 |
* 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 |
---|---|---|
89% | With N-ethyl-N,N-diisopropylamine; trichlorophosphate; In acetonitrile; for 36h;Reflux; | Step B: Preparation of 2,4,7-trichloroquinazoline. A mixture of 7-chloro-1H-quinazoline-2,4-dione (2.0 g, 10 mmol) was suspended in ACN (50 mL), then POCl3 (5.0 mL, 55 mmol) was added. This was followed by addition of DIEA (5.0 mL, 28 mmol). The resulting mixture was heated to reflux for 36 h, and then allowed to cool to rt and concentrated. The residue was carefully treated with ice and sodium bicarbonate. The resulting solid was collected by filtration and dried. Chromatographic purification (EtOAc/hexanes 0:100 to 10:90) provided the titled compound (2.1 g, 89%). The MS and NMR data are in agreement with those that have been previously described: Bioorganic & Medicinal Chemistry, 2003, 11, 2439-2444. 1H NMR (400 MHz, DMSO-d6): 8.32 (d, J=8.7 Hz, 1H), 8.20 (d, J=1.9 Hz, 1H), 7.93 (dd, J=9.0, 2.1 Hz, 1H). |
In ice-water; trichlorophosphate; | b) 10.5 g (0.053 mol) of 7-chloro-1,2,3,4-tetrahydro-quinazoline-2,4-dione were suspended in 35 ml (0.48 mol) of phosphorus oxychloride and heated to 120 C. for 24 hrs. The reaction mixture was left to cool to room temperature and poured on to ice-water. The brown precipitate was filtered off under suction, dried and chromatographed over silica gel with methylene chloride as the eluent. There were obtained: 7.2 g (58%) of 2,4,7-trichloroquinazoline as yellow crystals; MS: me/e=232, 234 (M+). | |
3.88 g | With N-ethyl-N,N-diisopropylamine; trichlorophosphate; for 4h;Reflux; | <Step 2> 2,4,7-trichloroquinazoline Diisopropylethylamine (9.21 ml, 52.9 mmol) was added to a mixture of 7-chloroquinazoline-2,4(1H,3H)-dione (5.2 g, 26.5 mmol) prepared in Step 1 and phosphorus oxychloride (26 ml), and they were stirred at reflux for 4 hours. After cooling the reaction mixture to room temperature, the same was added into ice water, and basified to pH 7-8 by using sodium bicarbonate. The aqueous layer was extracted with dichloromethane, and the organic layer was dried on anhydrous magnesium sulfate and concentrated under reduced pressure. The resulting residue was purified with silica gel column chromatography (dichloromethane) to give the titled compound (3.88 g) as a white solid. 1H NMR (400 MHz, CDCl3) delta 8.22 (d, 1H), 8.01 (s, 1H), 7.68 (d, 1H). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
3% | In N,N-dimethyl acetamide; at 200℃; for 0.5h;Microwave irradiation; | Step 2 (Method F):; A solution of <strong>[6625-94-1]2,4,7-trichloro-quinazoline</strong> (35.0 mg, 0.15 mmol, 1.0 equiv) and 1-(3-ethoxy-4-methoxy-benzyl)-piperidin-4-ylamine (47.6 mg, 0.18 mmol, 1.2 equiv; intermediate Al) in DMAc (2 mL) was heated by microwave irradiation to 200 0C for 30 min. Removal of the solvent under reduced pressure and purification by preparative HPLC on reversed phase eluting with a gradient of acetonitrile/water provided 1.8 mg (3%) of the title compound. MS (ISP): 461.3 [M+H]+. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With trichlorophosphate; In N,N-dimethyl-aniline; for 3h;Reflux; | General procedure: 2,4-Dihydroxy-6-chloroquinazoline (M1) (16.0 g, 0.081 mol) was added to the reaction flask.Add phosphorus oxychloride (47 ml, 0.515 mol),N,N-dimethylaniline (31 ml, 0.243 mol) was added dropwise with stirring at room temperature for 3 hours under reflux.Stop heating,Pour into 500ml of ice water.Precipitating a brownish black solid,Filtering,dry,Column chromatography (petroleum ether - ethyl acetate) to give a pale yellow solid 8.74g, yield 46.2%. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
In ice-water; dimethyl sulfoxide; butan-1-ol; | c) 0.845 g (8.13 mmol) of ethyl carbazate was added to a solution of 0.95 g (4.07 mmol) of <strong>[6625-94-1]2,4,7-trichloroquinazoline</strong> in 40 ml of dimethyl sulphoxide. The reaction mixture was stirred at 70 C. for 2 hrs. and then poured on to ice-water. The brown precipitate was filtered off and dried. The brown crystals were suspended in 20 ml of n-butanol and the suspension was heated to 90 C. for 2 hrs. The mixture was left to cool to room temperature, the crystals were filtered off and dried in a vacuum. There was obtained 0.45 g (39%) of ethyl 7-chloro-2-hydroxy-4-quinazolinecarbazate as white crystals; MS: me/e=282 (M+). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
72% | 0.20 g (0.86 mmol) of <strong>[6625-94-1]2,4,7-trichloroquinazoline</strong> was reacted with methylamine and purified according to general procedure C to furnish 0.17 g of the title compound in 72% yield. 1H NMR (500 MHz, CDCl3) delta 7.72 (d, J=2.0 Hz, 1H), 7.62 (d, J=8.8 Hz, 1H), 7.39 (dd, J=8.7, 2.0 Hz, 1H), 3.22 (d, J=4.9 Hz, 3H). 13C NMR (126 MHz, CDCl3) delta 161.2, 158.9, 151.5, 139.6, 126.9, 122.2, 123.5, 111.7, 28.6. Rf=0.80 (DCM/MeOH 10:1). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
92% | Step C: Preparation of 2,7-dichloro-4-oxoquinazoline. A 1.0 M aqueous solution of sodium hydroxide (19 mL, 19 mmol) was added to a mixture of <strong>[6625-94-1]2,4,7-trichloroquinazoline</strong> (2.0 g, 8.5 mmol) and THF (30 mL) that had been cooled to 0 C. The reaction mixture was allowed to warm to rt and was stirred vigorously for 2 h. The mixture was concentrated to remove the THF, and the remaining aqueous phase was cooled to 0 C. and acidified by addition of 1.0 M aqueous HCl (25 mL). The resulting mixture was allowed to stand at 0 C. for 20 min, the solid was collected by filtration and dried to provide the titled compound (1.7 g, 92%). The MS and NMR data are in agreement with those that have been previously described: Journal of Medicinal Chemistry, 2007, 50, 2297-2300. |