Preparation method of 2, 4-diamino-6-chloropyrimidine
A technology of diamino and chloropyrimidine, which is applied in the field of preparation of 2,4-diamino-6-chloropyrimidine, can solve the problems of complex operation, high cost and low yield, and achieve high yield and strong repeatability , the effect of reducing risk
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Embodiment 1
[0016] A kind of preparation method of 2,4-diamino-6-chloropyrimidine provided by the present invention, first carry out the synthesis of 2,4-diamino-6-hydroxypyrimidine: use methanol as solvent, under the action of sodium methylate, hydrochloric acid Guanidine and ethyl cyanoacetate were heated to reflux for cyclization. After the reaction was complete, the solvent was evaporated to dryness, and then water was added, and the pH was adjusted to 7 with acetic acid, stirred thoroughly and then filtered to obtain 2,4-diamino-6-hydroxypyrimidine. This step can significantly improve the yield: the experimental data results show that when pH=7 is adjusted with hydrochloric acid, because the precipitated 2,4-diamino-6-hydroxypyrimidine is easy to react with hydrochloric acid to form hydrochloride and dissolve in water, while at pH When =9, 2,4-diamino-6-hydroxypyrimidine is not easy to react with hydrochloric acid, so the yield of adjusting pH to below 8 with hydrochloric acid is not...
Embodiment 2
[0021] The preparation method of 2,4-diamino-6-hydroxypyrimidine in this example: add guanidine hydrochloride (100.00 g, 1.00 eq.) and MeOH (300 mL) to the reaction flask, add MeONa (62.21 g, 1.10 eq. .), heated to 60-70°C and stirred for 0.5h. Under stirring at 60-70°C, ethyl cyanoacetate (118.41 g, 1.00 eq.) was added dropwise to the reaction system, and stirring was continued for more than 3 hours after the addition was completed. Cool down to 40-50°C, concentrate, and remove the solvent as much as possible. Add water (800 mL) to the concentrate, and add about 20 mL of glacial acetic acid to adjust the pH to 7 while stirring and controlling the temperature at 0-10 °C. After filtration, the filter cake was rinsed with 100 mL of water, collected and dried to obtain 2,4-diamino-6-hydroxypyrimidine (127.00 g, 96.2% yield).
[0022] 2,4-Diamino-6-chloropyrimidine was prepared by adding 2,4-diamino-6-hydroxypyrimidine (20.00 g, 1.00 eq.) to the reaction flask, followed by caref...
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