90004-09-4|7-Aminoquinazolin-4(1H)-one| Ambeed

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CAS No. :	90004-09-4
Formula :	C₈H₇N₃O
M.W :	161.16
SMILES Code :	NC1=CC=C2C(=O)NC=NC2=C1
MDL No. :	MFCD00234413

Yield	Reaction Conditions	Operation in experiment
70%	With stannous chloride dihydrate; In ethyl acetate; for 8h;Reflux;	General procedure: To a three necked flask, substituted anthranilic acid (1 meq.) was added in excess of formamide (6 meq). The reaction mixture was then heated at 140 C for 4-6 h. The reaction was monitored with thin layer chromatography and upon completion; ice was added to the reaction mixture. The resultant solid was filtered, washed with water, dissolved in ethyl acetate, dried over MgSO4 and concentrated to obtain the pure desired product. Where product did not precipitate on addition of ice, the reaction mixture was extracted with ethyl acetate, dried over MgSO4 and concentrated to obtain the desired quinazolin-4(3H)-one derivatives 1-9, 11-15, 17-21 and 23-25.The amino derivatives 10, 16 and 22 were prepared using the following general procedure:To a reaction flask, substituted nitroquinazolin-4(3H)-one derivative (0.3 g, 1.56 mmol) was added followed by addition of 6 mL ethyl acetate and SnCl2·2H2O (2.12 g, 9.42 mmol), then reaction mixture was refluxed for 8 h. The reaction mixture was cooled to room temperature and quenched with saturated sodium bicarbonate solution, followed by repeated extraction with ethyl acetate (3 × 50 mL). The organic layers were combined, dried over anhydrous MgSO4 and concentrated to obtain the desired amino substituted quinazolin-4(3H)-one derivatives 10, 16 and 22.The substituted anthranilic acid (1 g) was dissolved in excess acetic anhydride (10 mL) and the resulting reaction mixture was stirred at room temperature for 4-7 h. The reaction was monitored for completion using thin layer chromatography. The solvent was evaporated under vacuum and the resultant residue was stirred with ammonia solution for 7 h. Upon completion, the reaction mixture was extracted with ethyl acetate (3 × 10 mL), the organic extracts were combined, dried over MgSO4 and evaporated to obtain compounds 26-30, 31a and 32. The 2-methyl-8-nitroquinazolin-4(3H)-one intermediate (31a) was reduced to compound 31 using the same procedure as reported in Scheme 1 for the synthesis of compounds 10, 16 and 22.
54%	With hydrogen;palladium 10% on activated carbon; In methanol; N,N-dimethyl-formamide; under 2585.81 Torr; for 21h;	A suspension of 7-nitroquinazolinone (5.2 g, 22.7 mmol) in DMF (150 mL) and methanol (100 mL) was hydrogenated over 10% palladium on carbon (600 mg) in a Parr shaker at 50 psi. The starting material was consumed in 3 h, but hydrogenation was continued for 18 h to ensure complete reaction. The mixture was filtered through diatomaceous earth, washing with methanol/DMF 2:1 until all of the product was eluted. The filtrate was evaporated to dryness. The solid residue was stirred with methanol (20 mL) for 1 h, filtered, washed with methanol and dried to give the crude amine (3.88 g), which contained a minor component (ca. 10%). The crude product was dissolved in 2 N HCl (100 mL), with warming, and the resulting solution was evaporated to dryness to give the hydrochloride salt. The salt was dissolved in boiling water (30 mL) and ethanol (30 mL) was added. The solvent was boiled down to 50 mL. The hydrochloride crystallized on cooling. The crystals were filtered, washed with a little ethanol and dried to give the pure salt (3.02 g). The salt was dissolved in water (30 mL) with warming to 65 C. in an oil bath. Ammonium hydroxide was added dropwise, causing immediate precipitation of the free base. The flask was cooled in ice, the crystals filtered, washed with water and dried to give the title compound (2.35 g, 54%).

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P321
P322
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P333 + P313	IF SKIN irritation or rash occurs: Get medical advice/attention.
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P337 + P313	IF eye irritation persists: Get medical advice/attention.
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Physical hazards
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H201	Explosive; mass explosion hazard
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H260	In contact with water releases flammable gases which may ignite spontaneously
H261	In contact with water releases flammable gas
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Code	Phrase
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H371	May cause damage to organs
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Environmental hazards
Code	Phrase
H400	Very toxic to aquatic life
H401	Toxic to aquatic life
H402	Harmful to aquatic life
H410	Very toxic to aquatic life with long-lasting effects
H411	Toxic to aquatic life with long-lasting effects
H412	Harmful to aquatic life with long-lasting effects
H413	May cause long-lasting harmful effects to aquatic life
H420	Harms public health and the environment by destroying ozone in the upper atmosphere

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CAS No.: 90004-09-4

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CAS No.: 90004-09-4

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