Abstract Convenient regioselective syntheses of 3‐acetates of methyl pyranosides of α‐L‐rhamnose, α‐ and β‐L‐arabinose, α‐D‐fucose, α‐D‐lyxose, and β‐D‐ribose with good yields have been attained using MoCl5 as catalyst. Methyl β‐L‐rhamnopyranoside under this conditions gave 2‐acetate.
摘要 α-
L-鼠李糖、α-和β-
L-阿拉伯糖、α-
D-岩藻糖、α-
D-来苏糖和β-
D-核糖的甲基
吡喃糖苷的3-
乙酸酯的方便区域选择性合成已获得良好的产率。以 MoCl5 为催化剂。在此条件下甲基β-L-
吡喃
鼠李糖苷生成
2-乙酸酯。