of the ring-chain tautomerism occurring in compounds equipped with two neighbouring carboxylic functions. Since 4-aroylfuran derivatives show a typical lignan backbone, suitable hydrogenation conditions were found out to gain tetrahydrofuran lignans.
通过简单调节
三氟甲磺酸酐促进的Friedel-Crafts酰化反应条件,可以从普通前体中选择性地高收率地制备3-或4-芳基
呋喃。可以根据在具有两个相邻羧基官能团的化合物中发生的环链互变异构现象来解释产物的形成。由于4-芳基
呋喃衍
生物显示出典型的
木脂素主链,因此发现合适的氢化条件获得了
四氢呋喃木脂素。