Branched-chain 2-nitroimidazole compound and application thereof in dosing system
A technology of nitroimidazoles and drug delivery system, applied in the field of compounds, can solve problems such as poor effect and insufficient targeting, and achieve the effects of improving targeting, reducing toxic and side effects, enhancing curative effect and bioavailability
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preparation example 1
[0047] Preparation of compound 2
[0048]
[0049] Under nitrogen protection, compound 1 (11.5 g, 50.9 mmol) was dissolved in anhydrous tetrahydrofuran (100 mL), and n-butyllithium (25.5 mL, 61.1 mmol) was slowly added dropwise at -78°C. After stirring at -78°C for 1 hour, p-toluenesulfonyl azide (7.0 g, 45.8 mmol) was added dropwise, and stirring was continued at -78°C for 1 hour. It was quenched by adding saturated ammonium chloride solution, extracted with ethyl acetate, and dried over anhydrous sodium sulfate. After the organic phase was concentrated, it was separated and purified by column chromatography (petroleum ether: ethyl acetate = 10:1) to obtain a yellow liquid (10.0 g, 82%). 1 H NMR (400MHz, CDCl 3 )δ6.73(s,1H),4.55(s,2H),3.40(s,3H),0.87(s,9H),0.04(s,6H). 13 C NMR (101MHz, CDCl 3 )δ141.43, 130.31, 125.17, 55.50, 29.57, 25.84, 18.23, -5.26. HRMS (ESI) m / z Calcd for C 11 h 22 N 5 OSi,[M+H] + :272.1907,found:272.1829.
preparation example 2
[0051] Preparation of compound 3
[0052]
[0053] Compound 2 (10.0 g, 37.5 mmol) was dissolved in 1M hydrochloric acid / methanol solution (100 mL), and after stirring at room temperature for 4 hours, triethylamine was added to adjust to neutrality. After the reaction solution was concentrated, it was washed with ether to obtain a yellow solid (5.0 g, 87%). Melting point: 105-107°C. 1 H NMR (400MHz, CDCl 3 )δ6.60(s, 1H), 4.47(s, 2H), 4.06(br, 1H), 3.40(s, 3H). 13 C NMR (101MHz, CDCl 3 )δ141.49, 130.80, 125.06, 54.21, 29.52. MS (ESI) Calcd forC 5 h 8 N 5 O,[M+H] + :154.07,found:154.07.
preparation example 3
[0055] Preparation of Compound 4
[0056]
[0057] Compound 3 (5.0 g, 32.7 mmol) was dissolved in dimethyl sulfoxide (30 mL), and 2-iodobenzoic acid (18.3 g, 65.4 mmol) was added in batches under ice-cooling, and stirred overnight at room temperature. It was quenched by adding water, the solid was filtered off, extracted with ethyl acetate, dried over anhydrous sodium sulfate, and the organic phase was concentrated to give a yellow solid (5.0 g, 100%). Melting point: 103-105°C. 1 H NMR (400MHz, CDCl 3 )δ9.58(s,1H),7.61(s,1H),3.71(s,3H). 13 C NMR (101MHz, CDCl 3 )δ178.4, 148.0, 142.3, 131.2, 31.8. MS (ESI) Calcd for C 5 h 6 N 5 O,[M+H] + :152.05,found:152.05.
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