首次开发了在B(C 6 F 5)3(5 mol%)存在下具有挑战性的无金属的α-芳基α-重氮酸酯叠氮化物插入物。该反应具有易于操作,底物范围宽和条件温和的特点,并以中等至高收率提供了相应的产物。更重要的是,由于未观察到环丙烷化或环丙烷化,因此对烯烃和炔烃官能团的耐受性良好。此外,在简单转化后,相应的叠氮化物产物可以转化为伯胺或1,2,3-三唑衍生物。
Rh(III)-Catalyzed Regio- and Chemoselective [4 + 1]-Annulation of Azoxy Compounds with Diazoesters for the Synthesis of 2<i>H</i>-Indazoles: Roles of the Azoxy Oxygen Atom
作者:Zhen Long、Zhigang Wang、Danni Zhou、Danyang Wan、Jingsong You
DOI:10.1021/acs.orglett.7b00631
日期:2017.6.2
tandem C–H alkylation/intramolecular decarboxylative cyclization of azoxy compounds with diazoesters for the synthesis of 3-acyl-2H-indazoles is disclosed. The azoxy instead of the azo group enables a distinct approach for cyclative capture, leading to a [4 + 1]-annulation rather than a classic [4 + 2] manner. The azoxy oxygen atom is traceless after annulation, and further removal from the product is
The intermolecular C–C, C–O, C–S and C–N bonds construction between diazo compounds and acyclic, cyclic 1,3-dicarbonyl compounds, thiophenol, alkynes were developed by using a TFMSA@SBA-15, providing a metal-free and eco-friendly platform.
diazoacetates with cysteine residues that enabled metal‐free, S−H functionalization under visible‐light conditions. Moreover, this process could be intensified by a continuous‐flow photomicroreactor on the acceleration of the reaction (6.5 min residence time). The batch and flow protocols described were applied to obtain a wide range of functionalized cysteine derivatives and cysteine‐containing dipeptides
Aminopalladation-Triggered Carbene Insertion Reaction: Synthesis of 2-(1<i>H</i>-Indol-3-yl)acetates
作者:Ziwei Hu、Shuang Luo、Qiang Zhu
DOI:10.1002/adsc.201400799
日期:2015.3.23
red carbeneinsertionreaction for the synthesis of C‐3 alkylated indole derivatives from ortho‐alkynyltrifluoroacetanilides and α‐diazoacetates is presented; it involves a palladium catalyst and a weak base in the open air. Yields range from 49–88% with excellent functional group tolerance. The reaction proceeds through intramolecular aminopalladation of alkynes followed by carbeneinsertion. Migratory
We established a highly enantioselective Si-H insertion reaction to construct chiral centers at the carbon and silicon atoms, using Ru(II)-Pheox catalyst. The catalytic asymmetric Si-H insertion reaction of [small alpha]-methyl-[small alpha]-diazoesters proceeded...