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。