Synthesis of pyrazolo-annelated heterocyclic ring compounds such as pyrazolo[3,4-<i>b</i>]pyridines and pyrazolo[4′,3′:5,6]-pyrido[2,3-<i>d</i>]pyrimidines
作者:Madhukar N. Jachak、Appasaheb B. Avhale、Ragunath B. Toche、Ram W. Sabnis
DOI:10.1002/jhet.5570440210
日期:2007.3
A series of pyrazolo[3,4-b]pyridines has been synthesized by Friedländer condensation of 5-amino-pyrazole-4-carbaldehyde 1 with active methylene compounds in basic medium. Pyrazolo[4′3′:5,6]pyrido-[2,3-d]pyrimidines have been synthesized from pyrazolo[3,4-b]pyridines using substituted urea and acetic anhydride.
通过在碱性介质中5-氨基-吡唑-4-甲醛1与活性亚甲基化合物的弗里德兰德缩合反应合成了一系列吡唑并[3,4- b ]吡啶。吡唑并[4'3':5,6]吡啶-[2,3- d ]嘧啶是由吡唑并[3,4- b ]吡啶使用取代的尿素和乙酸酐合成的。