Divergent pathways to furosesquiterpenes: first total syntheses of (+)-zedoarol and (Rac)-gweicurculactone
作者:Elissavet E. Anagnostaki、Vera P. Demertzidou、Alexandros L. Zografos
DOI:10.1039/c4cc09298h
日期:——
A non-natural hydroxy-elemane was found amenable to divergent transformations, producing either polyunsaturated guaianes under basic, oxygen-free conditions, or oxidized furogermacranes when anionic oxy-Cope reaction quenched by an oxidant is employed. Based on these findings, the firsttotalsyntheses of zedoarol and gweicurculactone are reported.
Non-natural Elemane as the “Stepping Stone” for the Synthesis of Germacrane and Guaiane Sesquiterpenes
作者:Elissavet E. Anagnostaki、Alexandros L. Zografos
DOI:10.1021/ol3031999
日期:2013.1.4
utilization as a common synthetic scaffold to produce structurally diverse germacrane and guaiane sesquiterpenes are described. A highly enantio- and stereoselective biomimetic tandem oxy-Cope/ene rearrangement was used as the key reaction to access the 10-membered macrocyclic core of germacranes and the condensed 5–7 carbocycles of guaiane sesquiterpenes. Additionally, reactions of furanoguaianes under acidic
Platinum-catalyzed cycloisomerizations of a common enyne: a divergent entry to cyclopropane sesquiterpenoids. Formal synthesis of sarcandralactone A
作者:Vera P. Demertzidou、Alexandros L. Zografos
DOI:10.1039/c6ob01226d
日期:——
A common enyne scaffold, resembling the structures of natural elemanes was found to be an excellent substrate for highly regioselectivecycloisomerizations to produce diverse cyclopropane sesquiterpenoids. Platinum-catalysis was utilized to produce either lindenane or myliol cores, found in natural products, starting from enyne acetate 10 and its corresponding allene 12 respectively. Based on this