Intramolecular Pauson−Khand Reactions of α,β-Unsaturated Esters and Related Electron-Deficient Olefins
摘要:
The intramolecular Pauson-Khand (PK) reaction of a variety of electron-poor enynes having an ester, cyano, or phosphonate group at the olefin terminus is described. Depending on the reaction conditions and substitution at the enyne, their dicobalthexacarbonyl complexes led preferentially to the exocyclic 1,3-diene or to the PK cyclopentenone product. In general, the 1,3-diene was obtained as the major product under N-oxide-promoted conditions, while the PK product was selectively formed in refluxing acetonitrile.
Labeling and Natural Post-Translational Modification of Peptides and Proteins via Chemoselective Pd-Catalyzed Prenylation of Cysteine
作者:Thomas Schlatzer、Julia Kriegesmann、Hilmar Schröder、Melanie Trobe、Christian Lembacher-Fadum、Simone Santner、Alexander V. Kravchuk、Christian F. W. Becker、Rolf Breinbauer
DOI:10.1021/jacs.9b08279
日期:2019.9.18
The prenylation of peptides and proteins is an important post-translational modification observed in vivo. We report that the Pd-catalyzed Tsuji–Trost allylation with a Pd/BIPHEPHOS catalyst system allows the allylation of Cys-containing peptides and proteins with complete chemoselectivity and high n/i regioselectivity. In contrast to recently established methods, which use non-native connections,
Rhodium-Catalyzed Intra- and Intermolecular [5 + 2] Cycloaddition of 3-Acyloxy-1,4-enyne and Alkyne with Concomitant 1,2-Acyloxy Migration
作者:Xing-Zhong Shu、Xiaoxun Li、Dongxu Shu、Suyu Huang、Casi M. Schienebeck、Xin Zhou、Patrick J. Robichaux、Weiping Tang
DOI:10.1021/ja2109097
日期:2012.3.21
type of rhodium-catalyzed [5 + 2] cycloaddition was developed for the synthesis of seven-membered rings with diverse functionalities. The ring formation was accompanied by a 1,2-acyloxy migration event. The five- and two-carbon components of the cycloaddition are 3-acyloxy-1,4-enynes (ACEs) and alkynes, respectively. Cationic rhodium(I) catalysts worked most efficiently for the intramolecular cycloaddition
Discovery of a multi-bond forming, four-step tandem process: construction of drug-like polycyclic scaffolds
作者:Mark W. Grafton、Louis J. Farrugia、Hans Martin Senn、Andrew Sutherland
DOI:10.1039/c2cc33649a
日期:——
A one-pottandem process involving an Overman rearrangement, ring closing enyne metathesis and a hydrogen bonding directed Diels-Alder reaction has been developed for the efficient diastereoselective synthesis of functionalised amino substituted tetralin and indene ringsystems.
Synthesis of Amino-Substituted Indanes and Tetralins via Consecutive Multibond-Forming Tandem Processes
作者:Mark W. Grafton、Louis J. Farrugia、Andrew Sutherland
DOI:10.1021/jo401182r
日期:2013.7.19
approach for the synthesis of amino-substituted indanes and tetralins from readily available alkyne-derived allylic alcohols via consecutive multibond-forming tandem processes has been developed. In the first one-pottandem process, a series of cyclic dienes were prepared using an Overman rearrangement under thermal conditions, followed by a ruthenium(II)-catalyzed ring closing enyne metathesis reaction.
Diastereoselective synthesis of highly substituted polycyclic scaffolds via a one-pot four-step tandem catalytic process
作者:Mark W. Grafton、Stuart A. Johnson、Louis J. Farrugia、Andrew Sutherland
DOI:10.1016/j.tet.2014.06.020
日期:2014.10
A rapid and diastereoselectivesynthesis of highly substituted aminobicyclo[4.3.0]nonanes and bicyclo[4.4.0]decanes from alkyne derived allylicalcohols has been developed using a one-pot multi-bond forming tandem catalytic process. Overmanrearrangement of the allylic trichloroacetimidates was followed by a ring closing enyne metathesis/cross metathesis sequence of reactions, in which both steps were