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.
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.