title: Pyrimidine derivatives and related compounds. 4. A route for the synthesis of pyrazolo[3,4-e]-as-triazines, pyrazolo[3,4-d]pyrimidines, and pyrazolo[1,5-c]-as-triazines.
mesh_terms: D055598:Chemical Phenomena; D002621:Chemistry; D008722:Methods; D011720:Pyrazoles / Q000138:chemical synthesis*; D011743:Pyrimidines / Q000138:chemical synthesis*; D014227:Triazines / Q000138:chemical synthesis*
chemical_list: D011720:Pyrazoles; D011743:Pyrimidines; D014227:Triazines