interactions with their target. Sesquiterpenelactones in particular are rich in Michael acceptors that react with cysteines. Several polycyclicscaffolds derived from total synthesis or readily available polycyclic terpenes were used as the starting point in the synthesis of a library aiming to project mildly reactive functionalities (Michael acceptors or chloroacetates) with diverse geometries. Screening of
A Bioinspired Approach to Tri-<i>nor</i>-guaianes. Synthesis of (−)-Clavukerin A
作者:Gonzalo Blay、Begoña García、Eva Molina、José R. Pedro
DOI:10.1021/np060184g
日期:2006.8.1
degradation of the C-7 side chain of related guaia-11-enes is described. In this approach (-)-clavukerin A (1) is obtained by selective ozonolysis-Criegge rearrangement of (+)-1alphaH,7alphaH,10alphaH-guaia-4,11-dien-3-one (4) to afford 7beta-hydroxy and 7beta-acetoxy tri-nor-guaiane derivatives 6 and 7, respectively, which after elimination and deoxygenation give the title compound. The starting guaiadienone
A Concise Catalytic Route to the Marine Sesquiterpenoids (-)-Clavukerin A and (-)-Isoclavukerin A
作者:Stephan Knüppel、Victor O. Rogachev、Peter Metz
DOI:10.1002/ejoc.201001087
日期:2010.11
zed strategy, the enantiopure title hydroazulenes were prepared in only four steps from (S)- and (R)-citronellal, respectively. A catalyst-controlled diastereoselective Michael addition of these aldehydes to methyl vinyl ketone followed by chemoselective dibromoolefination and one-pot Wittig olefination/alkyne formation afforded the key dienynes that underwent regioselective domino metathesis to yield
Enantioselective synthesis of clavukerin A and itsepimer was carried out. By the comparison of the spectral data and specific rotations of synthesized and natural ones, two trisnorsesquiterpens isolated from Clavulia and Cespitularia species are confirmed to be identical.