Tellurium in organic synthesis: a general approach to buteno- and butanolides
作者:Renan S. Ferrarini、Alcindo A. Dos Santos、João V. Comasseto
DOI:10.1016/j.tet.2012.07.088
日期:2012.10
The naturally occurring butanolides (−)-blastmycinolactol, (+)-blastmycinone, (−)-NFX-2, (+)-antimycinone as well as the four stereoisomers of the butenolide Acaterin were prepared in high enantiomeric purity using hydroxy-vinyl tellurides as starting materials.
Elucidation of the stereostructure of the annonaceous acetogenin (+)-montecristin through total synthesis
作者:Christian Harcken、Reinhard Brückner
DOI:10.1039/b002905j
日期:——
Total syntheses of ent-5-epi-montecristin (1a) and of (−)-montecristin (1b) were accomplished. The stereocenters of compounds 1a and 1b were established by asymmetric dihydroxylations of the trans-configurated β,γ-unsaturated esters 6 ( → 4, up to 80% ee; Scheme 3; improved procedure with up to 94% ee: Scheme 7) and 56 ( → 55, 97% ee: Scheme 9) while the stereogenic CC bonds stem from the carbocuprations
Sharpless AD strategy towards the γ-methyl butenolide unit of acetogenins: enantioselective synthesis of butenolide I and II with mosquito larvicidal activity
作者:Yan-Tao He、Hui-Na Yang、Zhu-Jun Yao
DOI:10.1016/s0040-4020(02)01063-3
日期:2002.10
butenolides has been established based on Sharpless asymmetric dihydroxylation in high yields and good enantiopurity. The route could be expanded to the synthesis of α,γ-disubstituted butenolide units of naturally occurring annonaceous acetogenins. Utilizing this strategy, three simple natural products with butenolide segments were synthesized enantioselectively.
Organocatalytic Enantiospecific Total Synthesis of Butenolides
作者:Rudrakshula Madhavachary、Rosy Mallik、Dhevalapally B. Ramachary
DOI:10.3390/molecules26144320
日期:——
Biologically important, chiral natural products of butenolides, (-)-blastmycinolactol, (+)-blastmycinone, (-)-NFX-2, (+)-antimycinone, lipid metabolites, (+)-ancepsenolide, (+)-homoancepsenolide, mosquito larvicidal butenolide and their analogues were synthesized in very good yields in a sequential one-pot manner by using an organocatalytic reductive coupling and palladium-mediated reductive deoxygenation