A diastereo- and enantioselective Michael addition of chiral amide enolates to α, β-unsaturated esters a stereoelective synthesis of (+)-dehydroiridodiol and (−)-isodehydroiridodiol
(+)-Dehydroiridodiol and (−)-isodehydroiridodiol were synthesized stereoselectively using the diastereo- and enantioselective Michael addition of chiral amide enolates to α, β-unsaturatedesters.
(±)-Dehydroiridodiol and its epimer (±)-isodehydroiridodiol were synthesized stereoselectively using the homoconjugate addition of cyanide anion to methyl 6-methyl-2-oxobicyclo[3.1.0]hexane-1-carboxylates. Both enantiomers of dehydroiridodiol were prepared after the resolution of l-menthyl 6-methyl-2-oxobicyclo[3.1.0]hexane-1-carboxylate, whose absolute configurations became clear as the result.
New Monoterpene Lactones of the Iridane Type from<i>Actinidia polygama</i>Miq.
作者:Tsutomu Sakai、Kimiko Nakajima、Takeo Sakan
DOI:10.1246/bcsj.53.3683
日期:1980.12
Fourteen iridoid monoterpene lactones including eight new compounds were isolated from the volatile oil of fresh fruits of the cat- and lacewing-attracting plant Actinidia polygama Miq., and their structures were established on the basis of spectral evidence and chemical transformation.
The base-catalyzed cyclization of 10-oxocitral synthesis of chrysomelidal and dehydroiridodial
作者:Franco Bellesia、Franco Ghelfi、Ugo M. Pagnoni、Adriano Pinetti
DOI:10.1016/s0040-4039(00)84024-1
日期:1986.1
Base treatment of 10-oxocitral () gives chrysomelidial () and dehydroiridodial (), supporting the intermediacy of in the biosynthesis of some iridoid glucosides. Cannizzaro reaction of and affords regioselectively a new iridolactone, 1,2-dehydroisoiridomirmecin ().