The benzyl mesylate was employed to construct the tetrasubstituted tetrahydrofuran lignan with avoiding Friedel-Crafts type of reaction. The optically pure 7,8-trans, 7′,8′-trans, 7,7′-cis, and 8,8′-cis-virgatusin stereoisomers were synthesized. The enantiomeric excess was >>99%.
利用
甲磺酸苄酯构建四代
四氢呋喃木质素,避免了 Friedel-Crafts 反应。合成了光学纯度为 7,8-反式、7′,8′-反式、7,7′-顺式和 8,8′-cis-irgatusin 立体异构体。对映体过量率>>99%。