Gold-Catalyzed Intramolecular Oxidative Cross-Coupling of Nonactivated Arenes
作者:Matthew N. Hopkinson、Arnaud Tessier、Andrew Salisbury、Guy T. Giuffredi、Lorraine E. Combettes、Antony D. Gee、Véronique Gouverneur
DOI:10.1002/chem.201000322
日期:2010.4.26
An (Au)some coupling! Gold‐catalyzed cascade CO cyclizations of benzyl‐substituted allenoate esters followed by intramolecular oxidative CC cross‐coupling involving aryl CH functionalization were performed with Selectfluor as the oxidant (see scheme). This operationally simple and mild procedure benefits from complete axis‐to‐center chirality transfer and allows for the preparation of surprisingly
Catalytic Cross-Coupling of Vinyl Golds with Diazonium Salts under Photoredox and Thermal Conditions
作者:Dilip V. Patil、Hokeun Yun、Senghoon Shin
DOI:10.1002/adsc.201500525
日期:2015.8.24
Catalytically generated vinyl gold complexes from tert‐butyl allenoates were found to undergo an efficient cross‐coupling with arenediazonium salts. The gold(I)‐gold(III) redox cycle can be accessed under two different conditions, i.e., visible‐light photoredox as well as a thermally induced radical chain pathway. The current C(sp2)C(sp2) cross‐coupling protocol that is catalytic in gold, would make available
The palladium(II)-catalyzed direct oxidative C–H olefination of readily available N-tosylacrylamides and allenoates for the synthesis of dienyl esters is described. The amide and ester moieties both act as the directing groups for the regio- and the stereo-controlled C–H functionalization/cyclization, which was proved by DFT calculations. Molecular oxygen was used as the terminaloxidant in the approach
Gold-Catalyzed Cascade Cyclization−Oxidative Alkynylation of Allenoates
作者:Matthew N. Hopkinson、Jonathan E. Ross、Guy T. Giuffredi、Antony D. Gee、Véronique Gouverneur
DOI:10.1021/ol102061k
日期:2010.11.5
A gold(I)-catalyzed cascade cyclization−oxidative cross-coupling process has been applied to prepare β-alkynyl-γ-butenolides directly from allenoates and various terminal alkynes. Following an initial gold-catalyzed C−O bond forming allenoatecyclization, a mechanism based on a AuI/AuIII redox cycle has been proposed with Selectfluor acting as the external oxidant.
金(I)催化的级联环化-氧化交叉偶联工艺已被用于直接从脲基酸酯和各种末端炔烃制备β-炔基-γ-丁烯内酯。在最初的金催化的C-O键形成脲酸酯环化之后,已经提出了一种基于Au I / Au III氧化还原循环的机理,其中Selectfluor用作外部氧化剂。
Gold-Catalyzed Simultaneous Formation of C–C, C═O, and C–F bonds in the Presence of Selectfluor: A Synthesis of Fluoroindenes from Allene Esters
作者:Yunkui Liu、Jie Zhu、Jianqiang Qian、Zhenyuan Xu
DOI:10.1021/jo3006528
日期:2012.6.15
An approach for the synthesis of fluorinated indene derivatives has been developed via a gold-catalyzed three-component tandem reaction between allene esters, Selectfluor, and water.