Gold Catalysis: Synthesis of 3-Acylindenes from 2-Alkynylaryl Epoxides
作者:A. Stephen K. Hashmi、Miriam Bührle、Ralph Salathé、Jan W. Bats
DOI:10.1002/adsc.200800385
日期:2008.9.5
A series of 2-alkynylarylepoxides were prepared by a sequence of Sonogashira coupling, Wittig olefination and epoxidation or a Darzens’ glycid ester synthesis. The conversion of these substrates with gold(I) catalysts furnished 3-acylindenes and, in occasional cases as side-products, the products of an isomerization of the oxirane ring to a ketone. Isotope labelling of the epoxide oxygen indicates
Gold(I) Complexes of KITPHOS Monophosphines: Efficient Cycloisomerisation Catalysts
作者:A. Stephen K. Hashmi、Annette Loos、Anna Littmann、Ingo Braun、Julian Knight、Simon Doherty、Frank Rominger
DOI:10.1002/adsc.200800681
日期:2009.3
Abstractmagnified imageGold(I)‐triflimide (AuNTf2)complexes of H‐KITPHOS and o‐MeO‐KITPHOS have been prepared and shown to be efficient catalysts for a range of intramolecular cyclisations to afford phenols, acylindenes, alkylidene oxazoles, tetrahydropyrans and lactones, in the majority of cases these catalysts are superior to those previously reported.