Synthesis process of adefovir dipivoxil raw medicine
A technology of adefovir dipivoxil and synthesis process, which is applied in the fields of compounds of Group 5/15 elements of the periodic table, chemical instruments and methods, organic chemistry, etc. The problems such as low recycling rate and high pollution and safety hazards have achieved the effect of reducing the burden of medication, low cost and low price.
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Embodiment 1
[0037] Synthesis of 1-chloro-2chloromethoxyethane
[0038] In a 500L reaction kettle, add 115Kg of 2-chloroethanol, then slowly add 42Kg of paraformaldehyde, lower the temperature to below 10°C, and slowly introduce dry hydrogen chloride gas under stirring. After 4 hours, the paraformaldehyde is completely dissolved. Stand and separate layers, add anhydrous sodium sulfate to the organic layer to dry overnight, distill under reduced pressure, collect fractions at 78-84°C / 10.64kPa, and measure by NMR to obtain 121Kg of 1-chloro-2chloromethoxyethane product, Yield: 72%.
[0039] Synthesis of Isopropyl 2-Chloroethoxymethylphosphonate
[0040] (1) In a 500L enamel reaction kettle, add 90Kg of 1-chloro-2-chloromethoxyethane, raise the temperature to 90°C, and add 130Kg of triisopropyl phosphite dropwise within 2.5 hours. After dropping, the temperature was raised to 125-130° C. to continue the reaction for 3 hours, and the reaction of 1-chloro-2-chloromethoxyethane was basically c...
Embodiment 2
[0048] Synthesis of 1-chloro-2chloromethoxyethane
[0049] In a 500L reaction kettle, add 150Kg of 2-chloroethanol, then slowly add 56Kg of paraformaldehyde, lower the temperature to below 10°C, and slowly introduce dry hydrogen chloride gas under stirring. After 4 hours, the paraformaldehyde is completely dissolved. Stand still to separate the water layer, add 80kg of anhydrous sodium sulfate to the organic layer, dry overnight, distill under reduced pressure, collect 78~84℃ / 10.64kPa fractions, and determine by NMR to obtain 1-chloro-2chloromethoxyethyl 161Kg of alkane colorless liquid, yield: 68%.
[0050] Synthesis of Isopropyl 2-Chloroethoxymethylphosphonate
[0051] In a 500L enamel reaction kettle, add 124kg of 1-chloro-2-chloromethoxyethane, raise the temperature to 90°C, and add 190Kg of triisopropyl phosphite dropwise within two hours. After dropping, the temperature was raised to 125-130° C. to continue the reaction for 3.5 hours, and the reaction of 1-chloro-2-chl...
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