19-Methyl-9-keto-15-hydroxy-prost-18-enoic acid derivatives and process
申请人:——
公开号:US04220798A1
公开(公告)日:1980-09-02
The invention provides novel 19-methyl-9-keto-15-hydroxy-prost-18-enoic, -prosta-13,18-dienoic and -prosta-5,13,18-trienoic acids and esters having antiulcer and antiasthma activity.
The asymmetric total syntheses of (+)-vulgarisins A–E, which share a rare [5-6-4-5] tetracyclic core structure, have been achieved for the first time in a divergent manner. Key features of the strategy involve a catalytic asymmetric intramolecular cyclopropanation, a one-pot borylation/conjugate addition process, a Wolff ringcontraction and a stereocontrolled pinacol cyclization.