Molecular Formula | C9H8F4N2O |
Molar Mass | 236.17 |
Density | 1.392±0.06 g/cm3(Predicted) |
Boling Point | 268.8±40.0 °C(Predicted) |
pKa | 12.86±0.46(Predicted) |
Storage Condition | Sealed in dry,Room Temperature |
patent for invention
application (patent) number:
CN202011153129.8
date of application:
20201026
public/announcement number:
CN112159358A
date of publication/announcement:
20210101
Applicant (patentee):
Shanghai puyi chemical technology co., ltd
Inventor:
yang hanrong , Li Tao , Wang bo
national and provincial code:
CN310117
Summary:
The present invention relates to a process for the preparation of an oxagoli intermediate 1(2 fluoro 6 trifluoromethyl phenyl) 6 methyl pyrimidine 2,4(1H,3H) diketone (I). This method uses 1(2 fluoro 6 trifluoromethyl phenyl) urea (V) and ketal-protected acetoacetate (IV) as raw materials, and reacts in the presence of a base to obtain a ketal intermediate (III), and then converts the ketal intermediate (III) into N((2 fluoro 6 trifluoromethyl phenyl) carbamoyl) 3-oxobutanamide (II), finally, oxagoli intermediate 1(2 fluoro 6 trifluoromethyl phenyl) 6 methyl pyrimidine 2,4(1H,3H) dione (I) was obtained by ring-closing reaction. The starting material of the invention is cheap and easy to obtain, and the acetyl acetate (IV) protected by ketal is used as the raw material, thereby avoiding the generation of isomers and improving the product quality.