Rh(<scp>iii</scp>)-Catalyzed tandem indole C4-arylamination/annulation with anthranils: access to indoloquinolines and their application in photophysical studies
the tandem C4 arylamination/annulation of indole derivatives with anthranil to provide indoloquinoline moieties. This method is simple and regioselective with a wide scope and functional group tolerance. Mechanistic studies revealed the important role of the newly installed azacycle in the conversion of O-protected aldoximes to their cyano derivatives. Studies were carried out to explore the promising
Interrupting the [Au]-Catalyzed Nitroalkyne Cycloisomerization: Trapping the Putative α-Oxo Gold Carbene with Benzo[<i>c</i>]isoxazole
作者:Pawan S. Dhote、Chepuri V. Ramana
DOI:10.1021/acs.orglett.1c00539
日期:2021.4.2
interrupted by possible trapping of the postulated intermediate α-oxo gold carbene with an external nucleophile such as benzo[c]isoxazole (anthranil). At the outset, this provides a simple synthesis of highly functionalized 3-acyl-(2-formylphenyl)-2H-indazoles with the sequential C–O, C–N, and N–N bond formations. This provides indirect support for the existence of α-oxo gold carbenes in the [Au]-catalyzed internal
通过假想的中间体α-氧代金卡宾可能被外部亲核试剂(例如苯并[ c ]异恶唑(蒽))捕获,从而中断了导致蒽基的2-炔基硝基苯的Au催化硝基炔环异构化。首先,它提供了具有连续C–O,C–N和N–N键形成的高度官能化的3-酰基-(2-甲酰基苯基)-2 H-吲唑的简单合成方法。这为在α-催化的炔炔的内部氧化还原过程中α-氧羰金的存在提供了间接支持。
Simple and scalable electrochemical synthesis of 2,1-benzisoxazoles and quinoline <i>N</i>-oxides
作者:Eduardo Rodrigo、Haralds Baunis、Edgars Suna、Siegfried R. Waldvogel
DOI:10.1039/c9cc06054e
日期:——
intramolecular cyclization affords different substituted 2,1-benzisoxazoles and quinoline N-oxides. This methodology allows the synthesis of two different types of heterocycles from common simple starting materials, using electrons as a sole reagent for this transformation. The electrolysis can be conducted in a very simple undivided electrolysis cell under constant current conditions. This permits working
A coupling reaction of 2-iodobiphenyl with benzoisoxazole under the cooperative catalysis of Pd(CH3CN)2Cl2 and P(4-F−Ph)3 is disclosed. The reaction proceeds via intramolecular C−H activation/N−O cleavage/migratory insertion sequence to give an array of N-arylcarbazoles with an aldehyde or a ketone. The employment of benzoisoxazoles as an amination agent obviates the need for stoichiometric amount