9-[2-(phosphonomethoxy)ethyl] adenine bicycloalkoxide and its preparation
A technology of bicyclic alcohol and phosphonyl, applied in the field of bicyclic alcohol ester compound and preparation thereof, can solve the problems such as insufficient antiviral resistance of bicyclic alcohol
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example 1
[0060] Example 1 Preparation of diethyl p-toluenesulfonylmethylphosphonate (intermediate 1)
[0061] Add 74ml of diethyl phosphite, 9ml of triethylamine, 22g of paraformaldehyde and 340ml of toluene into a three-necked flask, control the temperature at 87°C for 2hrs, then raise the temperature and reflux for 5hrs, stop the reaction, cool to 0°C, add 100g of benzenesulfonyl chloride After that, 82 g of triethylamine was added dropwise (the temperature was controlled to be less than 10°C, and the drop was completed in about 3 hours), reacted at room temperature for 24 hours, cooled, filtered, washed with toluene, washed with water, dried over anhydrous magnesium sulfate, filtered, and concentrated to obtain 100 g of intermediate 1.
example 2
[0062] Example 2 Preparation of 9-[2-hydroxyethyl)adenine (intermediate 2)
[0063] Add 4g of sodium hydroxide, 200g of adenine, 160g of ethylene carbonate and 1000ml of DMF into a three-neck flask, raise the temperature to 135°C and react for 8hr-10hr (TLC detects that no adenine stops the reaction, developer: acetone: ethyl acetate: ammonia water =4:3:1), cooled to 50°C, added 1400ml of toluene, freeze crystallized, filtered, washed with cold toluene and absolute ethanol, dried in vacuum (60°C) to obtain 290g of off-white solid.
example 3
[0064] Example 3 Preparation of 9-[2-[diethyloxyphosphorylmethoxy]ethyl]adenine (intermediate 3, referred to as PMEA ethyl ester)
[0065] Add 20g of 9-(2-hydroxyethyl)adenosine and 80ml of DMF into a three-necked flask, raise the temperature to 125°C for 1 hour, and add 19g of sodium tert-butoxide in batches under cooling conditions (the feeding temperature should be less than 20°C). Complete, ice-bath cooling, dropwise the solution (temperature control 0 ℃) of the 80ml DMF of 54g benzenesulfonylmethylphosphonic acid diethyl ester, dropwise, 0 ℃ reaction 5hr (TLC detects that there is no 9-(2-hydroxyethyl base) adenine raw material, developer: ethanol: dichloromethane=1:4), add 67g of glacial acetic acid, react for 1hr at 20°C, concentrate in vacuum to semi-solid, add dichloromethane, filter, the filtrate is concentrated, and dichloromethane Extract with methane, wash with water, dry, concentrate, add 150ml of toluene to the concentrated solution, freeze and crystallize, filt...
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