作者:G. Berti、G. Catelani、F. Colonna、L. Monti
DOI:10.1016/0040-4020(82)80194-4
日期:1982.1
between 4-methoxy-3-buten-2-one and isobutyl vinyl ether, which was converted into a mixture of the isobutyl β- and α-oleandrosides through hydroboration-oxidation. The latter reaction is highly diastereoselective since attack by borane takes place exclusively anti to the OMe group: none of the diasteroisomeric cymarosides are formed. The only side-products are small amounts of the isobutyl β- and α-amicetodies
从4-甲氧基-3-丁烯-2-酮与异丁基乙烯基醚之间的狄尔斯-阿尔德加合物开始,得到外消旋的夹竹桃糖(2,6-二脱氧-3-O-甲基-阿拉伯-己酮)通过硼氢化反应氧化异丁基β-和α-油酸的混合物。后者的反应是高度非对映选择性的,因为硼烷的攻击仅对OMe基团发生:没有形成非对映异构环核苷。唯一的副产物是在硼氢化步骤中发生的脱甲氧基化作用形成的少量异丁基β-和α-酰胺基。