Preparation method of drug intermediate 1,3-dicyclohexyl barbituric acid for inhibiting angiogenesis, tumorigenesis and proliferative diseases
A technology for dicyclohexylbarbituric acid and proliferative diseases, applied in the fields of organic chemistry and drug synthesis, can solve problems such as reversible loss of female fertility, and achieve the effects of high product yield, easy operation and simple process
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Embodiment 1
[0021] In a three-necked flask, add 150.0ml of glacial acetic acid, 65.0g of N'N-dicyclohexylurea and 33.0g of malonic acid, raise the temperature, add 120ml of acetic anhydride dropwise at 80°C, keep the temperature for 4 hours, and distill under reduced pressure. Add 500ml of absolute ethanol, reflux, cool to 0-5°C, stir and crystallize, and filter to obtain 75.0g of product with a content of more than 99.5%.
Embodiment 2
[0023] In a three-necked flask, add 150.0ml of glacial acetic acid, 65.0g of N'N-dicyclohexylurea and 33.0g of malonic acid, raise the temperature, add 120ml of acetic anhydride dropwise at 100°C, keep the temperature for 4 hours, and distill under reduced pressure. Add 500ml of absolute ethanol, reflux, cool to 0-5°C, stir and crystallize, and filter to obtain 78.0g of product with a content of more than 99.5%.
[0024]
Embodiment 3
[0026] Add 150.0ml of glacial acetic acid, 65.0g of N'N-dicyclohexyl urea and 33.0g of malonic acid into a three-necked flask, raise the temperature, add 120ml of acetic anhydride dropwise, keep the temperature for 4 hours, distill under reduced pressure, and add 100.0ml Water and 60.0ml concentrated hydrochloric acid were heated to reflux, cooled and filtered to obtain 59.0g with a content of more than 99.0%.
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