Synthesis of α-enaminones from cyclic ketones and anilines using oxoammonium salt as an oxygen transfer reagent
作者:Biping Xu、Yaping Shang、Xiaoming Jie、Xiaofeng Zhang、Jian Kan、Subhash Laxman Yedage、Weiping Su
DOI:10.1039/c9gc03845k
日期:——
A convenient and straightforward transformation of cyclicketones with anilines at room temperature has been developed using oxoammonium salt TEMPO+PF6− as an oxidant. This method enabled the synthesis of a broad range of α-enaminones. The 18O-labeling experiment demonstrated that oxoammonium salt served as the oxygen transfer reagent.
Rh‐Catalyzed Chemodivergent [3+3] Annulations of Diazoenals and α‐Aminoketones: Direct Synthesis of Functionalized 1,2‐Dihydropyridines and Fused 1,4‐Oxazines
作者:Pratap Kumar Mandal、Sreenivas Katukojvala
DOI:10.1002/chem.202303862
日期:2024.4.2
Chemodivergent [3+3] annulations: The reactivity of Rh-enalcarbenoid has been switched from carbenoid to vinylogous NH-insertion by altering acyclic to cyclic α-amino ketones to deliver functionalized 1,2-dihydropyridines (1,2-DHPs) and fused 1,4-oxazines respectively. The structural diversification of 1,2-DHP and fused 1,4-oxazines gave valuable piperidines, pyrido[1,2-a]indole, 2-pyridone, hexahydroquinolin-2(1H)-ones