Rh(III)-Catalyzed Spiroannulation Reaction of <i>N</i>-Aryl Nitrones with 2-Diazo-1,3-indandiones: Synthesis of Spirocyclic Indole-<i>N</i>-oxides and Their 1,3-Dipolar Cycloaddition with Maleimides
作者:Shenghai Guo、Ziyi Zhang、Zhaotong Wei、Yuanqing Zhu、Xuesen Fan
DOI:10.1021/acs.joc.3c00117
日期:2023.3.17
An efficient strategy for the preparation of spirocyclic indole-N-oxide compounds through a Rh(III)-catalyzed [4 + 1] spiroannulation reaction of N-aryl nitrones with 2-diazo-1,3-indandiones as C1 synthons under extremely mild conditions is presented. From this reaction, 40 spirocyclic indole-N-oxides were easily obtained in up to 98% yield. In addition, the title compounds could be successfully used
Two Distinct Gold-Catalyzed Oxidative Annulations of 1,5-Allenynes with Nitrones to Yield 1-Naphthol Derivatives Bearing 2,3- versus 3,4-Fused Nitroxy Rings
作者:Debashis Barik、Chandrima Maitra、Chi-Tien Hsieh、Mu-Jeng Cheng、Rai-Shung Liu
DOI:10.1021/acscatal.3c05620
日期:2024.2.2
Nitrone cycloaddition to quinones: A novel strategy for the synthesis of benzisoxazolidenes
作者:Rony Rajan Paul、Vimal Varghese、P. B. Beneesh、C. R. Sinu、E. Suresh、E. R. Anabha
DOI:10.1002/jhet.255
日期:——
1,3‐Dipolar cycloaddition reaction involving nitrones and benzoquinones resulting in the formation of benzisoxazolidene is described. As the nitrone is selectively added to carbon–carbon double bond of the benzoquinone, the quinone‐nitrone reaction is considered as a special case among quinone‐1,3‐dipole cycloaddition reactions. Molecular orbital calculation was performed to examine the electronic