Palladium-Catalyzed Intramolecular C-H Amination in Water
作者:Lizheng Yang、Hao Li、Haifei Zhang、Hongjian Lu
DOI:10.1002/ejoc.201601043
日期:2016.12
found to be effective for intramolecular C–H amination in water. With 2-azidobiphenyls as substrates, the reaction efficiently provided various carbazoles with N2 as the sole byproduct. The reaction showed high functional-group tolerance and could be used in the synthesis of several natural carbazole alkaloids. The catalytic process was promoted by water, and the reaction was inefficient in the organic
发现钯 (II) 催化对水中的分子内 C-H 胺化有效。以 2-叠氮联苯为底物,该反应有效地提供了各种咔唑,N2 作为唯一的副产物。该反应显示出高官能团耐受性,可用于合成多种天然咔唑生物碱。催化过程受水促进,在所研究的有机溶剂中反应效率低下。
Rh<sub>2</sub>(II)-Catalyzed Synthesis of Carbazoles from Biaryl Azides
作者:Benjamin J. Stokes、Brankica Jovanović、Huijun Dong、Kathleen J. Richert、Ryan D. Riell、Tom G. Driver
DOI:10.1021/jo9002536
日期:2009.4.17
An array of carbazoles (23 examples) can be synthesized from substituted biaryl azides at 60 degrees C using substoichiometric quantities of Rh-2(O2CC3F7)(4) or Rh-2(O2CC7H15)(4).
AbstractThe nucleophilic iron complex Bu4N[Fe(CO)3(NO)] (TBA[Fe]) catalyzes the direct intramolecular C−H amination of α‐azidobiaryls and (azidoaryl)alkenes into the corresponding carbazoles and indoles, respectively, under mild conditions and with low catalyst loadings. These features and the broad functional‐group tolerance render this method a particularly attractive alternative to established noble‐metal‐based procedures.
Catalytic enantioselective synthesis of chiral spirocyclic 1,3-diketones <i>via</i> organo-cation catalysis
作者:Xiao-Yan Zhang、Ya-Ping Shao、Bao-Kuan Guo、Kun Zhang、Fu-Min Zhang、Xiao-Ming Zhang、Yong-Qiang Tu
DOI:10.1039/d1cc05205e
日期:——
provides convenient access to a range of enantioenriched spirocyclic 1,3-diketones in moderate to high yields and enantioselectivities and features a broad substrate scope in terms of enol lactones. The catalytic capability of this triazolium salt catalyst is also demonstrated in this enantioselective transformation, which could inspire its further application.
Visible-light-promoted intramolecular C–H amination in aqueous solution: synthesis of carbazoles
作者:Lizheng Yang、Yipin Zhang、Xiaodong Zou、Hongjian Lu、Guigen Li
DOI:10.1039/c7gc03392c
日期:——
An effective and operationally simpleprotocol is reported for the synthesis of versatile carbazoles. With water as a co-solvent, visible-light rather than various metals is used to facilitate the conversion of readily available 2-azidobiphenyls under mild conditions. Various functionalized bioactive natural alkaloids, such as glycoborine, clausine C, clausine L, clausine H and clauszoline K, were