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
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.
Copper-Catalyzed Cascade Substitution/Cyclization of<i>N</i>-Isocyanates: A Synthesis of 1-Aminobenzimidazolones
作者:Jing An、Howard Alper、André M. Beauchemin
DOI:10.1021/acs.orglett.6b01686
日期:2016.7.15
A copper-catalyzedcascadereaction of in situ generated nitrogen-substituted isocyanates (N-isocyanates) and 2-iodoanilines has been developed. The cascade relies on the base-catalyzed substitution of masked N-isocyanates, followed by Cu(I)-catalyzed coupling to afford a variety of 1-aminobenzimidazolones in moderate to excellent yields. This is the first example of a transition-metal-catalyzed cascade