Polycyclic compounds (I) can be prepared in accordance with the following reaction formula: ##STR1## wherein R.sub.1 -R.sub.8 each represents a hydrogen atom, a hydroxyl group, an alkoxyl group or a substituted or unsubstituted benzyloxy group or neighboring two groups of R.sub.1 -R.sub.8 are coupled together to form an alkylenedioxy group; and A is an alkylene group which may be substituted by one or more alkoxycarbonyl groups, an alkenylene group which may be substituted by one or more alkoxycarbonyl groups, or a group represented by any one of the following formulas: ##STR2##
多环化合物(I)可以根据以下反应方程式制备:其中R.sub.1-R.sub.8分别表示
氢原子、羟基、烷
氧基或取代或未取代的苄
氧基,或相邻的R.sub.1-R.sub.8两个基团偶合在一起形成亚烷二
氧基基团;A是一个烷基基团,可以被一个或多个烷
氧羰基基团取代,也可以是一个
烯烃基团,可以被一个或多个烷
氧羰基基团取代,或者是由以下任一公式代表的基团: