Diastereoselective hydrogenations of α-alkyl α-(2,3,4,6-tetra-O-acetyl-β-<scp>D</scp>-glucopyranosyloxy)methylene carbonyl compounds. New route to stereopure α-alkyl α-oxymethyl carbonyl compounds
作者:David S. Larsen、Anthony Schofield、Richard J. Stoodley、Peter D. Tiffin
DOI:10.1039/p19960002487
日期:——
Wittigcondensation of the stabilisedphosphoranes 9, 10 and 26 with 1-formyl-2,3,4,6-tetra-O-acetyl-β-D-glucopyranose 11 leads to the vinylogous carbonates 12, 13 and 22. The salts 27–30 and 44, prepared from the corresponding carbonyl compounds, ethyl formate and sodium methoxide, react with acetobromoglucose 21 to give compounds 22–25 and 43.