Clay montmorillonite in carbohydrates : Use of 'claysil' as an efficient heterogenous catalyst for the intramolecular Ferrier reactions leading to 1,6-anhydro rare saccharides

Article abstract of DOI:10.1016/S0957-4166(00)86263-1

Clay montmorillonite supported silver reagent - claysil - was prepared and advantageously used in the intramolecular Ferrier reaction of 6-hydroxy glycals 1a-9c. The unsaturated sugars 13a-21c so obtained were stereoselectively hydroxylated leading to the