Cu-Catalyzed Tandem Aerobic Oxidative Cyclization for the Synthesis of 3,3′-Bipyrroles from the Homopropargylic Amines
作者:Zhenjie Qi、Yong Jiang、Bingxiang Yuan、Yanning Niu、Rulong Yan
DOI:10.1021/acs.orglett.8b02201
日期:2018.8.17
Cu-catalyzed method for the synthesis of 3,3′-bipyrroles from homopropargylic amines through tandem aerobic oxidative cyclization involving the formation of C–C bond has been developed. The features of this reaction are a small number of Cu catalysis and simple starting substrates. Moreover, this procedure exhibits good functional group tolerance and a series of 3,3′-bipyrroles derivatives are obtained
Gold(I)/Chiral Brønsted Acid Catalyzed Enantioselective Hydroamination-Hydroarylation of Alkynes: The Effect of a Remote Hydroxyl Group on the Reactivity and Enantioselectivity
作者:Valmik S. Shinde、Manoj V. Mane、Kumar Vanka、Arijit Mallick、Nitin T. Patil
DOI:10.1002/chem.201405061
日期:2015.1.12
range of pyrrole‐based aromatic amines to give pyrrole‐embedded aza‐heterocyclic scaffolds bearing a quaternary carbon center. The presence of a hydroxylgroup in the alkyne tether turned out to be very crucial for obtaining products in high yields and enantioselectivities. The mechanism of enantioinduction was established by carefully performing experimental and computational studies.
A Sequential Activation of Alkyne and C–H Bonds for the Tandem Cyclization and Annulation of Alkynols and Maleimides through Cooperative Sc(III) and Cp*-Free Co(II) Catalysis
[4 + 2] oxidative Diels–Alder reaction of readily available alkynols with maleimide is achieved for the rapid access of pthalimide-fused multicyclic compounds. The reaction is proposed to go through a sequence of Sc(OTf)3-catalyzed electrophilic cyclization, ligand exchange with Cp*-free cobalt, and C–H activation followed by maleimide insertion.
Gold(I)‐Catalyzed Domino Reaction: An Access to Furooxepines
作者:Roméric Galéa、Gaëlle Blond
DOI:10.1002/adsc.202200019
日期:2022.4.26
bicyclic acetals, also named furooxepines through a gold(I)-catalyzed domino reaction. During this transformation, two molecules of homopropargyl alcohol react together, in a sequence including an intramolecular hydroalkoxylation, condensation, a 1,6-enyne cycloisomerization, acetalization and an isomerization. This gold(I)-catalyzed domino reaction allow the formation of three bonds, two heterocycles