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
化学发散 [3+3] 环化:通过将无环 α-氨基酮改变为环状 α-氨基酮,Rh-enalcarbenoid 的反应性已从类胡萝卜素转变为插烯 NH-插入,以提供功能化的 1,2-二氢吡啶 (1,2-DHP) 和融合分别为1,4-恶嗪。 1,2-DHP和稠合1,4-恶嗪的结构多样化得到有价值的哌啶、吡啶并[1,2-a]吲哚、2-吡啶酮、六氢喹啉-2( 1H )-酮、六氢喹啉和四氢喹啉酮。