From Tetronic Acid and Furfural to C(4)-Halogenated, Vinylated and Formylated Furan-2(5H)-ones and Their 5-Alkoxy Derivatives
作者:E. Lattmann、H. M. R. Hoffmann
DOI:10.1055/s-1996-4156
日期:1996.1
Tetronic acid and furfural have been elaborated into the title compounds. Palladium-catalyzed cross coupling with vinylstannanes and controlled ozonolysis followed by anhydrous workup are key reactions.
Pyranofuranones via Lewis Acid Mediated Hetero-Diels-Alder Reactions of 4-Furan-2(5H)-ones: A Convergent Route to the Manoalide Substructure
作者:E. Lattmann、J. Coombs、H. M. R. Hoffmann
DOI:10.1055/s-1996-4158
日期:1996.1
A variety of dienes and 4-formylfuran-2(5H)-ones enter into hetero-Diels-Alder reactions. The choice of Lewis acid is decisive and must be tuned to the reactivity of both diene and dienophile. Sensitive cycloadducts are prepared in the presence of Me3Al/AlCl3 and a straightforward route to pyranofuranones is described.