Protective group-free synthesis of 3,4-dihydroxytetrahydrofurans from carbohydrates: formal total synthesis of sphydrofuran
作者:Henri A. van Kalkeren、Stefan van Rootselaar、Frank S. Haasjes、Floris P.J.T. Rutjes、Floris L. van Delft
DOI:10.1016/j.carres.2012.09.004
日期:2012.11
investigated the protective group-free Wittig reaction and subsequential acidcatalyzed intramolecular cyclization of unprotected carbohydrates to obtain 3,4-dihydroxytetrafurans. In this process, we have found that, when using Lewisacids and poly-alcohol substrates, additional attention should always be given to the catalytic nature of the acid as it might involve its ligands instead of the metal. Furthermore