First enantioselective synthesis of (–)- and (+)-virgatusin, tetra-substituted tetrahydrofuran lignan
作者:Satoshi Yamauchi、Momotoshi Okazaki、Koichi Akiyama、Takuya Sugahara、Taro Kishida、Takehiro Kashiwagi
DOI:10.1039/b501151e
日期:——
The first highly enantioselective syntheses of tetra-substituted tetrahydrofuran lignan, (-)- and (+)-virgatusin, were achieved. Hemiacetal was stereoselectively obtained from Evans's syn-aldol product as a single isomer. This hemiacetal was converted to (-)-virgatusin via hydrogenolysis. (+)-Virgatusin was also synthesized through the same process. The enantiomeric excess of the both enantiomers was
实现了四取代的四氢呋喃木脂素(-)-和(+)-维他汀的第一个高对映选择性的合成。半缩醛以单一异构体的形式从埃文斯的顺式羟醛产物立体选择性地获得。该半缩醛通过氢解被转化为(-)-维他汀。(+)-Virgatusin也通过相同的方法合成。两种对映体的对映体过量均被确定为大于99%ee。