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
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。