Photochemical O−H Functionalization Reactions of Cyclic Diazoamides
作者:Claire Empel、Dennis Verspeek、Sripati Jana、Rene M. Koenigs
DOI:10.1002/adsc.202000818
日期:2020.11.4
Herein, we describe the photochemical O−H functionalization reaction of acidic alcohols with cyclic diazoamides. We studied the O−H functionalization reaction of different fluorinated and non‐fluorinated alcohols to give the corresponding ether products in high yields (43 examples, up to 97% yield). Furthermore, we performed studies to evaluate a photoexcited proton transfer reaction pathway in comparison
Construction of 2-alkynyl aza-spiro[4,5]indole scaffolds <i>via</i> sequential C–H activations for modular click chemistry libraries
作者:Jun Zhang、Mengmeng Wang、Huiying Wang、Hui Xu、Junjie Chen、Ziqiong Guo、Biao Ma、Shu-Rong Ban、Hui-Xiong Dai
DOI:10.1039/d1cc02798k
日期:——
one-pot, three-step synthesis demonstrated the utility of this protocol. Hybrid conjugates with an oseltamivir derivative further offered a powerful tool for the construction of a versatile spiroindole-containing library via click chemistry.
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.
A facile synthesis of indanone-fused spirooxindoles is disclosed by directing the reactivity of η3-oxoallyl Pd-intermediate toward 5-exo-trig mode of cyclization. The Pd-catalyzed reaction of the rationallydesigned starting material 3-arylidene oxindoles with isatin-derived tosylhydrazone afforded the spirooxindoles having all-carbon quaternary center through carbene migratory insertion followed by
Copper(II)-Catalyzed Domino Synthesis of Indolo[3,2-<i>c</i>]quinolinones via Selective Carbonyl Migration
作者:Dhanarajan Arunprasath、Govindasamy Sekar
DOI:10.1021/acs.orglett.8b03557
日期:2019.2.15
A Cu(II)-catalyzed dominoprocess involving the carbene N–H insertion, intramolecular aldol-type trapping and unprecedented ring-expansion of oxindole core through C3-selective 1,2-carbonyl migration is described for the synthesis of indolo[3,2-c]quinolinones. This tetracyclic core, having an all-carbon quaternary center, was efficiently synthesized in high yields from amines and 3-diazo-oxindoles
描述了吲哚合成的Cu(II)催化的多米诺过程,该过程涉及卡宾N–H插入,分子内醛醇型捕获和通过C3选择性1,2-羰基迁移引起的羟吲哚核的空前扩环[3, 2- c ]喹啉酮。该四环核具有全碳的季中心,可以高效率地由胺和3-重氮-氧吲哚合成。机理研究表明,该反应是通过逐步途径进行的,并且路易斯酸铜与原位形成的TfOH痕迹的隐含布朗斯台德酸度之间具有协同催化作用。