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:——
Wittig condensation of the stabilised phosphoranes 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.
稳定的膦烷9、10和26与1-甲酰基-2,3,4,6-四-O-乙酰基-β - D-吡喃葡萄糖11的维蒂希缩合产生碳酸乙烯基酯12、13和22。盐27由相应的羰基化合物,甲酸乙酯和甲醇钠制备的–30和44,与乙酰溴葡萄糖21反应,得到化合物22–25和43。