Copper Hydride Catalyzed Enantioselective Synthesis of Axially Chiral 1,3-Disubstituted Allenes
作者:Liela Bayeh-Romero、Stephen L. Buchwald
DOI:10.1021/jacs.9b07582
日期:2019.9.4
The general enantioselective synthesis of axially chiral disubstituted allenes from prochiral starting materials remains a long-standing challenge in organic synthesis. Here, we report an efficient enantio- and chemoselective copper hydride catalyzed semireduction of conjugated enynes to furnish 1,3-disubstituted allenes using water as the proton source. This protocol is sufficiently mild to accommodate
Molecular construction of HIV-gp120 discontinuous epitope mimics by assembly of cyclic peptides on an orthogonal alkyne functionalized TAC-scaffold
作者:P. R. Werkhoven、M. Elwakiel、T. J. Meuleman、H. C. Quarles van Ufford、J. A. W. Kruijtzer、R. M. J. Liskamp
DOI:10.1039/c5ob02014j
日期:——
An orthogonally alkyne functionalized TAC-scaffold was used for molecular construction of biologically active gp120 protein mimics containing different peptide loops.
Oxidative alkynylation of acrylate esters with propargylic alcohols giving conjugated enyne esters was realized by use of a diene–rhodium catalyst. Propargylic alcohols were found to be useful alkynylating reagents in the present reaction to produce alkynylrhodium species via carbon–carbon bond cleavage. An excess of the acrylate ester worked as a hydride acceptor to reproduce the active rhodium species