A convenient synthesis of pyrazolo[3,4-<i>d</i>]pyrimidine-4,6-dione and pyrazolo[4,3-<i>d</i>]pyrimidine-5,7-dione derivatives
作者:M. El Haddad、M. Soukri、S. Lazar、A. Bennamara、G. Guillaumet、M. Akssira
DOI:10.1002/jhet.5570370536
日期:2000.9
Pyrazolo-[3,4-d]pyrimidine-4,6-diones 5 and pyrazolo[4,3-d]pyrimidine-5,7-diones 7 were synthesized by Curtius rearrangement of pyrazolic mono-esters 2 and 3 followed by hetero-cyclization via the ureas derivatives 4 and 6 under alkaline conditions.
吡唑并-[3,4- d ]嘧啶-4,6-二酮5和吡唑并[4,3 - d ]嘧啶-5,7-二酮7是通过吡唑单酯2和3的Curtius重排,然后杂原子合成的。-cyclization经由脲类衍生物4和6在碱性条件下。