Superacidic cyclization of higher terpenoid acids and their esters
摘要:
The superacidic cyclization of aliphatic and partially cyclized C-15-C-25 terpenoid acids and their esters proceeds structure-selectively and stereospecifically, affording a-isomers of completely cyclized epimeric beta,gamma-unsaturated acids of esters; the configuration of their carboxylic or ester groups is predetermined by the configuration of the double bond conjugated with the carboxyl or ester groups in the starting compounds.
Polyprenyl compound, process for the production thereof and drug
申请人:Eisai Co., Ltd.
公开号:US04742058A1
公开(公告)日:1988-05-03
A novel polyprenyl compound such as a polyprenyl carboxylic acid amide is disclosed. It has antithrombic and antiplatelet aggregation activity.
揭示了一种新型的聚戊二烯化合物,例如聚戊二烯羧酸酰胺。它具有抗血栓和抗血小板聚集活性。
CYCLISATION PROCESS OF FORMING A MULTIPLE RING COMPOUND
申请人:Loh Teck Peng
公开号:US20100228058A1
公开(公告)日:2010-09-09
The present invention relates to a cyclisation process of forming a multiple ring compound from an isoprenoid compound. The cyclisation process involves reacting the isoprenoid compound with an acetal initiator under conditions sufficient to form the multiple ring compound. The isoprenoid compound is contacted with an initiator an optionally with a catalyst. Cyclisation occurs by reaction of the initiator with the isoprenoid compound. Cyclic acetal compounds wherein the acetal forms part of 6-membered unsaturated ring are also defined.