Synthesis of Pyrido[2,3-d]pyrimidines Catalyzed by 2,3-Dichloro-5,6-dicyano-1,4-benzoquinone (DDQ)/tert-Butyl Nitrite (TBN)/O2
作者:Dongping Cheng、Jing-Hua Li、Xiaoliang Xu、Hongshuang Xia、Huafang Gu、Yawei Wang
DOI:10.1055/a-2156-7470
日期:2023.12
uracils/thiouracil with 1,3-diarylpropenes is disclosed. It undergoes oxidative coupling, intramolecular cyclization, and dehydro-aromatization to provide multi-substituted pyrido[2,3-d]pyrimidines/thiopyrido[2,3-d]pyrimidines in moderate to excellent yields. It has the advantages of high atom economy, green terminal oxidant, and metal-free conditions.
公开了在2,3-二氯-5,6-二氰基-1,4-苯醌(DDQ)/亚硝酸叔丁酯(TBN)/O2催化下,尿嘧啶/硫尿嘧啶与1,3-二芳基丙烯的高效串联氧化反应。它经历氧化偶联、分子内环化和脱氢芳构化,以中等至优异的产率提供多取代的吡啶并[2,3-d]嘧啶/硫代吡啶并[2,3-d]嘧啶。具有原子经济性高、末端氧化剂绿色、无金属条件等优点。