Tsumura Co., Ltd.

Takeshi Wakamatsu

Akihide Koda

Hiroshi Mitsuhashi, Deceased

By Tomoai Mitsuhashi, Heir

Yutaka Ono

Masahide Tanaka

By Hiroyuki Mitsuhashi, Heir

Hideyuki Ozawa

By Mieko Mitsuhashi, Heiress

Hideki Kawamura

Koji Waragai

Masao Maruno

Compound and use of the same as medicine

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##

Process for the preparation of polycyclic compounds using ferric

Growing community of inventors

Ibaraki, Japan

Takeshi Wakamatsu