Intramolecular azavinyl carbene-triggered rearrangement of furans
作者:Anton S. Makarov、Maxim G. Uchuskin、A. Stephen K. Hashmi
DOI:10.1039/c9sc02299f
日期:——
An intramolecular rhodium-catalyzed reaction of 1-tosyl-1,2,3-triazoles with furans has been explored. The tosylimino functionality was found to play a significant chemical role participating in the subsequent domino-transformations of a key reaction intermediate. One of the reaction pathways leads to valuable 2-formyl- and 2-acetylpyridine building blocks, which could be obtained in one-pot starting
Gold Catalysis: Dihydroisobenzofurans and Isochromanes by the Intramolecular Furan/Alkyne Reaction
作者:A. Stephen K. Hashmi、M. Wölfle、Filiz Ata、Melissa Hamzic、Ralph Salathé、Wolfgang Frey
DOI:10.1002/adsc.200600367
日期:2006.11
furyl alcohols and homofuryl alcohols was synthesized by reduction of furfurals or reaction of furyllithium compounds with epoxides and subsequent propargylation. The gold-catalyzed cycloisomerization of these products furnished dihydroisobenzofurans and isochromanes. Crystal structure analyses proved the sequence of the substituents for both classes of products. Unsaturated dicarbonyl compounds as side-products