title: Synthesis and biological activities of some N4-substituted 4-aminopyrazolo(3,4-d)pyrimidines.
abstract: Syntheses and biological activities of 26 N4-substituted 4-aminopyrazolo[3,4-d]pyrimidines as analogs of naturally occurring modified nucleic acid bases, N-(purin-6-ylcarbamoyl)-L-threonine and N6-(delta2-isopentenyl)adenine, are described. 4-Aminopyrazolo[3,4-d]pyrimidine was converted into the desired intermediate, ethyl pyrazolo[3,4-d]pyrimidine-4-carbamate (2). 4-Ureidopyrazolo[3,4-d]pyrimidines (6-26) were prepared by displacement of the ethoxy group of the carbamate 2 by amino acids and a variety of amines and by a reaction of 4-aminopyrazolo[3,4-d]pyrimidine (1) with isocyanates. N4-Alkylaminopyrazolo[3,4-d]pyrimidines were generally prepared by displacement of the chlorine from 4-chloropyrazolo[3,4-d]pyrimidine with various amines. Several analogs exhibited moderate to very good growth inhibitory activities against cultured L1210 leukemia and 6410 human leukemic myeloblasts.
mesh_terms: D000818:Animals; D000970:Antineoplastic Agents / Q000138:chemical synthesis* / Q000494:pharmacology; D002478:Cells, Cultured; D006801:Humans; D066298:In Vitro Techniques; D007939:Leukemia L1210 / Q000378:metabolism; D015470:Leukemia, Myeloid, Acute / Q000378:metabolism; D051379:Mice; D011720:Pyrazoles / Q000138:chemical synthesis / Q000494:pharmacology; D011743:Pyrimidines / Q000138:chemical synthesis* / Q000494:pharmacology
chemical_list: D000970:Antineoplastic Agents; D011720:Pyrazoles; D011743:Pyrimidines