First Enantiospecific Synthesis of the Antitumor Marine Sponge Metabolite (−)-15-Oxopuupehenol from (−)-Sclareol
摘要:
[GRAPHICS]A new route toward puupehenone-related bioactive metabolites from (-)-sclareol, based on the palladium(II)-mediated diastereoselective cyclization of a drimenylphenol, is described. Utilizing this, the first enantiospecific synthesis of the antitumor and antimalarial (-)-15-oxopuupehenol, together with improved syntheses of (+)-puupehenone, (+)-puupehedione, and (+)-15-cyanopuupehenone, were accomplished.
An Efficient Stereoselective Synthesis of Cytotoxic 8-Epipuupehedione
作者:Veronica Armstrong、Alejandro F. Barrero、Enrique J. Alvarez-Manzaneda、Manuel Cortés、Beatriz Sepúlveda
DOI:10.1021/np030029r
日期:2003.10.1
An efficient and highly stereoselectivesynthesis of cytotoxic 8-epipuupehedione (1b) was achieved starting from natural (-)-drimenol (6). The key step to obtain stereoselectivity was the simultaneous demethylation and oxidation of the dihydrobenzopyran methoxy derivatives 10a and 10b.
A divergent and expeditious access to haterumadienone- and puupehenone-type marine natural products has been achieved by using a newly developed hemiacetalization/dehydroxylation/hydroxylation/retro-hemiacetalization tandem reaction as one of the key steps. Its applicability is showcased by the first synthesis of haterumadienone, 20-hydroxyhaterumadienone, 20-epihydroxy-haterumadienone and 20-acetoxy-haterumadienone
Synthesis and antitumor activity of puupehedione and related compounds
作者:Alejandro F. Barrero、Enrique J. Alvarez-Manzaneda、Rachid Chahboun、M. Cortés、V. Armstrong
DOI:10.1016/s0040-4020(99)00992-8
日期:1999.12
The first enantiospecific synthesis of bioactive marine puupehedione (2) and relatedcompounds from (−)-sclareol (11) is reported. The antitumoractivity of these compounds was assayed and compared with that of the natural products.