A 1,4-addition strategy using an enone and a copper reagent was studied for the synthesis of (−)-piperitylmagnolol. A MOM-protected biphenol copper reagent was added to BF3·OEt2-activated 4-isopropylcyclohexenone, whereas 1,4-addition of protected monophenol reagents possessing an allylgroup was found to be unsuccessful. The allylgroup was later attached to the p-,p′-diiodo-biphenol ring by Pd-catalyzed
The [2 + 3] and [3 + 4] annulation of enones. Enantiocontrolled total synthesis of (-)-retigeranic acid
作者:Tomas Hudlicky、Alison Fleming、Lilian Radesca
DOI:10.1021/ja00199a032
日期:1989.8
La reaction de cyclenes-2ones avec des bromocrotonates donne en une etape les vinylcyclopropanes corespondants. Ces derniers subissent differentes transpositions et fournissent des derives pentaleno dioxole, des bicyclo [3.3.0] octene-1, des bicyclo [4.3.0] nonene-7, des bicyclo [5.3.0] decene-8 ― carboxylates d'ethyle. Application a la synthese de l'acide retigeranique
La 反应 de cyclenes-2ones avec des bromocrotonates donne en une etape lesvinylcyclopropanes corespondants。Ces derniers subissent differentes transpositions etfournissent des 衍生出pentaleno dioxole, des bicyclo [3.3.0] octene-1, des bicyclo [4.3.0] nonene-7, des bicyclo [5.3.0] decene-8 - 羧酸盐d'ethyle。应用 a la synthese de l'acide retigeranique
Total synthesis of eudesmane terpenes: cyclase phase
作者:Ke Chen、Yoshihiro Ishihara、María Morón Galán、Phil S. Baran
DOI:10.1016/j.tet.2010.02.088
日期:2010.6
of the lowest oxidized members of the eudesmane family of natural products, is presented. The final synthetic sequence illustrates a nine-step, gram-scale, enantioselective route to this bicyclic terpene with excellent stereocontrol and in 21% overall yield.
Stereoselective and Modular Assembly Method for Heterocycle-Fused Daucane Sesquiterpenoids
作者:Mien Christiaens、Jan Hullaert、Kristof Van Hecke、Duchan Laplace、Johan M. Winne
DOI:10.1002/chem.201803248
日期:2018.9.18
A stereoselective synthetic method is reported for the molecular framework found in common daucane and isodaucane sesquiterpenoid natural products. The synthetic method constitutes a scalable, modular, and also asymmetric access to a complex natural product scaffold, wherein the substitution pattern and the stereochemistry can be adjusted simply by choosing different starting materials. The method allows
Diphenylprolinol Methyl Ether: A Highly Enantioselective Catalyst for Michael Addition of Aldehydes to Simple Enones
作者:Yonggui Chi、Samuel H. Gellman
DOI:10.1021/ol0517729
日期:2005.9.1
[reaction: see text] Diphenylprolinol methyl ether catalyzes intermolecular Michaeladdition of simple aldehydes to relatively nonactivated enones with the highest enantioselectivities reported to date (95-99% ee) and significantly lower catalyst loadings than have been typical in this arena.