Adding a certain compound to certain chemical reactions, such as: 60792-79-2, name is 2,2′-Oxybis(ethylamine) dihydrochloride, belongs to ethers-buliding-blocks compound, can increase the reaction rate and produce products with better performance than those obtained under traditional synthetic methods. Here is a downstream synthesis route of the compound 60792-79-2, name: 2,2′-Oxybis(ethylamine) dihydrochloride
To a solution of 7-chloro-1-cyclopropyl-6-fluoro-4-oxo-1,4-dihydro-quinoline-3-carboxylic acid (0.55 g, 1.95 mmol) in 1-methyl-2-pyrrolidone (40 mL) bis-(2-aminoethyl)-ether dihydrochloride (2.1 g, 11.9 mmol, 6eq.) and DBU (3.49 mL, 23.4 mmol, 12 eq.) added and the reaction mixture was stirred at 110 C. for 18 hours. The reaction mixture was then diluted with water (70 mL) and the pH was adjusted to 11 and extracted with CH2Cl2 (9*40 mL). Water layer was then acified with H2SO4 to pH 6.8, extracted with 50 mL of CH2Cl2 and then evaporated in vacuum. Crude product was diluted in 2-propanol (60 mL), stirred at 82 C. for 20 minutes and filtrated. Precipitate was pure salt (Na2SO4). 2-Propanol was evaporated in vacuum and product was purified by column chromatography (fraction, eluent: CH2Cl2-MeOH-NH3-CH3CN=4:4:2:1) yielding 0.5 g of title compounds as a mixture of chloro and fluoro derivatives in ratio 3:1 MS (ES+) m/z: [MH]+=365.8 (A) (75%) MS (ES+) m/z: [MH]+=349.4 (B) (25%).
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Reference:
Patent; Pliva-Istrazivacki Institut d.o.o.; Glaxo Group Limited; US2006/258600; (2006); A1;,
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