A RhIII‐catalyzed C–H activation/cyclativecaptureapproach, involving a nucleophilic addition of C(sp3)–Rh species to polarized double bonds is reported. This constitutes the first intermolecular catalytic method to directly access 1‐aminoindolines with a broad substituent scope under mild conditions.
Synthesis of Cinnolines and Cinnolinium Salt Derivatives by Rh(III)-Catalyzed Cascade Oxidative Coupling/Cyclization Reactions
作者:Yanwei Wang、Bin Li、Baiquan Wang
DOI:10.1021/acs.joc.8b01548
日期:2018.9.21
A novel method for the synthesis of cinnolines and cinnolinium salt derivatives via Rh(III)-catalyzed cascade oxidative coupling/cyclizationreaction from Boc-arylhydrazines and alkynes has been developed. The reactions have a broad substrate scope and high stereoselectivity with readily available starting materials and provides an efficient synthetic route for this kind of compounds. A catalytically
A redox‐neutral cobalt(III)‐catalyzed synthetic approach for the direct synthesis of unprotected indoles showcasing an N−Nbondcleavage is reported. The herein newly introduced Boc‐protected hydrazines establish a beneficial addition to the limited portfolio of oxidizing directing groups for cobalt(III) catalysis. Moreover, the developed catalytic methodology tolerates a good variety of functional
Synthesis of Hydrazines via Radical Generation and Addition of Azocarboxylic <i>tert</i>-Butyl Esters
作者:Chen-Hao Ru、Shi-Huan Guo、Gao-Fei Pan、Xue-Qing Zhu、Ya-Ru Gao、Yong-Qiang Wang
DOI:10.1021/acs.orglett.8b00448
日期:2018.4.6
A new chemistry of azo compounds that is a radical generation and addition in situ of azocarboxylic tert-butyl esters to synthesize hydrazines has been described. The protocol provides a novel strategy for the synthesis of various hydrazines. The advantages of the transformation include broad substrate scope, benign conditions, and convenient operation.
Diaza [1,4] Wittig-type rearrangement of N-allylic-N-Boc-hydrazines into γ-amino-N-Boc-enamines
作者:Eiji Tayama、Yoshiaki Kobayashi、Yuka Toma
DOI:10.1039/c6cc04626f
日期:——
Diaza [1,4] Wittig-type rearrangement of N-allylic-N-Boc-hydrazines into [small alpha]-amino-N-Boc-enamines was demonstrated. The scope and limitation, experimental mechanistic studies, and a proposed reaction mechanism were also described.