Towards the total synthesis of tangutorine by intramolecular Diels–Alder reaction
作者:James A. Wilkinson、Nicolas Ardes-Guisot、Sylvie Ducki、John Leonard
DOI:10.1016/j.tetlet.2005.09.058
日期:2005.11
The syntheses of 3,5-disubstituted-2-sulfolenes, and their participation in Pictet–Spengler reactions to give precursors of tangutorine, are described.
Novel methods for the synthesis of 5-substituted-3-carboxy-2,5- and 4,5-dihydrothiophenes and 5-substituted 2- and 3-sulfolenes
作者:James A. Wilkinson、Nicolas Ardes-Guisot、Sylvie Ducki、John Leonard
DOI:10.1016/j.tet.2006.11.061
日期:2007.1
Various approaches to the syntheses of 5-substituted-3-carbomethoxy-2,5-dihydrothiophenes and their product sulfolenes, required as synthetic precursors for tangutorine, are described. An efficient route to 3,5-disubstituted-4,5-dihydrothiophenes and hence 3,5-disubstituted-2-sulfolenes by radical chemistry is also described.