Synthesis of Spiro[indazole-3,3′-indolin]-2′-ones and Indazolo [2,3-c]quinazolin-6(5H)-ones from Arynes and Isatin-Derived N-Tosylhydrazones
作者:Bin Cheng、Taimin Wang、Hongbin Zhai、Yixuan He、Xinping Zhang、Hui Li、Zijie Ding、Lizhe Feng、Haiyan Sun
DOI:10.1055/a-1509-5175
日期:2021.10
(3+2) annulation reaction between isatin-derived N-tosylhydrazones and o-(trimethylsilyl)aryl triflates allows facile synthesis of spiro[indazole-3,3′-indolin]-2′-ones in high to excellent yields. Furthermore, indazolo[2,3-c]quinazolin-6(5H)-ones could be accessed from the same starting materials in one-pot fashion via an annulation/rearrangement pathway.
靛红衍生的 N-甲苯磺酰腙和邻-(三甲基甲硅烷基)芳基三氟甲磺酸酯之间的正式 (3+2) 环化反应允许以高产率轻松合成螺[吲唑-3,3'-吲哚]-2'-酮。此外,吲唑并 [2,3-c] 喹唑啉-6(5H)-酮可以通过环化/重排途径以一锅法从相同的起始材料中获得。