Method for synthesizing 2-methyl-5-nitroimidazole-1-ethanol
A technology of nitroimidazole and methyl is applied in the field of synthesizing 2-methyl-5-nitroimidazole-1-ethanol, and can solve the problem of low reaction efficiency of a kettle type reactor, large consumption of formic acid and sodium hydroxide, and production cost. Low and other problems, to achieve the effect of high reaction efficiency and finished product conversion rate, lower production cost, and less material back-mixing
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Embodiment 1
[0023] In a 500ML stirred tubular circulating reactor, add 52 parts of formic acid with a mass concentration of 70%, dropwise add 35 parts of sulfuric acid with a mass concentration of 95%, control the temperature below 20°C, and then add 80 parts of 2-methyl -5-nitroimidazole, configured as a mixed solution, and the mixed solution was slowly heated to 72°C. Then add ethylene oxide and mass concentration to the reactor alternately and be the sulfuric acid of 95%, the ethylene oxide addition is respectively: 18,10,14 and 12 parts, the sulfuric acid addition is respectively 6,3 and 2.5 parts. After the alternate addition, keep the temperature of the reactor at 72°C, 2-methyl-5-nitroimidazole reacts with ethylene oxide to generate 2-methyl-5-nitroimidazole-1-ethanol, and the reaction time is 5 hours. Then cool down the reacted solution to room temperature, add an appropriate amount of water, stir, and add sodium hydroxide to adjust the pH to 5. Then the solution was cooled to ro...
Embodiment 2
[0025] In a 500ML stirred tubular circulating reactor, add 43 parts of formic acid with a mass concentration of 98%, dropwise add 38 parts of sulfuric acid with a mass concentration of 90%, control the temperature below 20°C, and then add 80 parts of 2-methyl -5-nitroimidazole, configured as a mixed solution, and the mixed solution was slowly heated to 85°C. Then alternately add ethylene oxide and mass concentration to the reactor and be 90% sulfuric acid, the ethylene oxide addition is respectively: 20, 12, 14 and 9 parts, the sulfuric acid addition is respectively 4, 4 and 2 parts. After the alternate addition, keep the temperature of the reactor at 85°C, and react 2-methyl-5-nitroimidazole with ethylene oxide to generate 2-methyl-5-nitroimidazole-1-ethanol, and the reaction time is 2.5 hours. Then cool down the reacted solution to room temperature, add an appropriate amount of water, stir, and adjust the pH value to 3.5 with sodium hydroxide. Then the solution was cooled t...
Embodiment 3
[0027] In a 500ML stirred tubular circulating reactor, add 46 parts of formic acid with a mass concentration of 88%, dropwise add 30 parts of sulfuric acid with a mass concentration of 98%, control the temperature below 20°C, and then add 80 parts of 2-methyl -5-nitroimidazole, configured as a mixed solution, and the mixed solution was slowly heated to 108°C. Then alternately add ethylene oxide and mass concentration to the reactor to be 98% sulfuric acid, the ethylene oxide addition is respectively: 20, 12, 14 and 9 parts, the sulfuric acid addition is respectively 4, 4 and 2 parts. After the alternate addition, the temperature of the reactor was kept at 108° C., and 2-methyl-5-nitroimidazole reacted with ethylene oxide to generate 2-methyl-5-nitroimidazole-1-ethanol. The reaction time was 3.5 hours. Then cool down the reacted solution to room temperature, add an appropriate amount of water, stir, and add sodium hydroxide to adjust the pH value to 4. Then the solution was co...
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