Hetero Diels-Alder reaction involving (E)-3-(tert-butyldimethylsiloxy)-1-(2′,3′,4′,6′-tetra- O-acetyl-β-d-glucopyranosyloxy)buta-1,3-diene and p-nitrobenzaldehyde
摘要:
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 dichloromethane.
Dirhodium(II) Tetrakis[N-benzene-fused Phthaloyl-(S)-piperidinonate] as a Chiral Lewis Acid: Catalytic Enantioselective Aldol Reactions of Acetate-derived Silylketene Acetals and Aldehydes