Hetero Diels-Alder reaction involving (E)-3-(tert-butyldimethylsiloxy)-1-(2',3',4',6'-tetra-O-acetyl -β-D-gl ucopyranosyloxy)buta-1,3-diene and p-nitrobenzaldehyde

Article abstract of DOI:10.1016/S0040-4039(00)73430-7

The title reaction, when carried out in carbon tetrachloride in the presence of a catalytic amount of Eu(fod)₃, leads mainly to the cis-cycloadduct 6a; the product undergoes isomerisation to its epimer 7a in the presence of the catalyst in dich