Demethylenative cyclization of 1,7-enynes using α-amino radicals as a traceless initiator enabled by Cu(i)-photosensitizers
摘要:
A Cu(i)-photosensitizer-enabled demethylenative radical cyclization of 1,7-enynes to access quinoline-2-(1H)-ones was successfully achieved using α-amino radicals as a traceless radical initiator.
Syntheses of <i>N</i>-Alkyl 2-Arylindoles from Saturated Ketones and 2-Arylethynylanilines via Cu-Catalyzed Sequential Dehydrogenation/Aza-Michael Addition/Annulation Cascade
We describe here a Cu-catalyzed and 4-OH-TEMPO-mediated sequential dehydrogenation/aza-Michael addition/annulation cascade reaction for the construction of N-alkyl 2-arylindoles from facilely available saturatedketones and 2-arylethynylanilines. This reaction shows high regioselectivity and tolerates a variety of functional groups. Moreover, 3-alkyl-substituted indoles can also be achieved when using
BF<sub>3</sub>-Etherate-Promoted Cascade Reaction of 2-Alkynylanilines with Nitriles: One-Pot Assembly of 4-Amido-Cinnolines
作者:Gopal Chandru Senadi、Babasaheb Sopan Gore、Wan-Ping Hu、Jeh-Jeng Wang
DOI:10.1021/acs.orglett.6b01207
日期:2016.6.17
2-alkynylanilines is described. This method achieves the formation of two new C–N bonds through a reaction sequence of diazotization with t-BuONO, nucleophilic addition of the alkyne to the BF3-coordinated diazonium ion, followed by nitrile addition to the intermediary vinyl cation and hydrolysis. The method provides efficient and general access to a variety of 4-amido-cinnolines. Notable features of the method
Enantioselective synthesis of indole derivatives by Rh/Pd relay catalysis and their anti-inflammatory evaluation
作者:Sifeng Li、Zihao Wang、Haitao Xiao、Zhaoxiang Bian、Jun (Joelle) Wang
DOI:10.1039/d0cc03158e
日期:——
An efficient Rh/Pd relay catalyzed intermolecular and cascade intramolecular hydroamination for the synthesis of exclusive trans 1-indolyl dihydronaphthalenols (up to 88% yield, 99% ee) is described under mild conditions.
An efficient palladium-catalyzed dearomatizing [2+2+1] carbocyclization of 1,7-enynes with iodophenols has been developed. A type of tetracyclicscaffold was built in this reaction, exhibiting a broad substrate scope with moderate to excellent yields. More importantly, this method provides a potential strategy for the synthesis of tetracyclic skeleton natural products.
Palladium-Catalyzed Regioselective Synthesis of 1-Benzoazepine Carbonitriles from<i>o</i>-Alkynylanilines via 7-<i>endo</i>-dig Annulation and Cyanation
作者:Ganesh Kumar Dhandabani、Mohana Reddy Mutra、Jeh-Jeng Wang
DOI:10.1002/adsc.201800865
日期:2018.12.21
report a three‐component, one‐pot cascade reaction involving an imination/annulation/cyanation sequence for the synthesis of 1‐benzoazepine carbonitrile derivatives using readily available o‐alkynylanilines, cyclic ketones and trimethylsilyl cyanide. This regio‐ and stereoselective reaction was achieved by combining palladium(II) trifluoroacetate and copper(II) acetate in dimethyl sulfoxide. The important