A Formal Total Synthesis of (+)-Methyl Trachyloban-18-oate and (+)-Methyl 16-Oxo-17-norkauran-18-oate: Regio- and Diastereoselective Preparation of Methyl (13S)-13-Hydroxyisoatisiren-18-oate from (?)-Abietic Acid
作者:Marco Berettoni、Giovanna De Chiara、Tommaso Iacoangeli、Paola Lo Surdo、Rinaldo Marini Bettolo、Lorenzo Montagnini Di Mirabello、Luca Nicolini、Rita Scarpelli
DOI:10.1002/hlca.19960790724
日期:1996.10.30
A novel preparation of methyl (13S)-13-hydroxyisoatisiren-18-oate (4), a key-intermediate in a synthesis of (+)-methyl trachyloban-18-oate ((+)-1), from (−)-abietic acid, is described. Since (−)-1 has been previously converted into (−)-methyl 16-oxo-17-norkauran-18-oate ((−)-16), our preparation of 4 constitutes also a formal total synthesis, from (−)-abietic acid, of (+)-16. Key steps in this approach