Syntheses of Theaspirone and Vitispirane <i>via</i> Palladium(II)-Catalyzed Oxaspirocyclization
作者:Ylva I. M. Nilsson、Attila Aranyos、Pher G. Andersson、Jan-E. Bäckvall、Jean-Luc Parrain、Christelle Ploteau、Jean-Paul Quintard
DOI:10.1021/jo9505031
日期:1996.1.1
Total syntheses of theaspirone (A and B) and vitispirane (A and B) are described. The key step in the syntheses is the palladium(II)-catalyzed intramolecular oxaspirocyclization of diene alcohol 4 to either vitispirane or the allylic alcohol 9. The outcome of the oxaspirocyclization is very much dependent on the solvent employed. In water-acetic acid (4:1) a 1:1 mixture of the diastereomeric alcohols
Marschall, Helga; Penninger, Josef; Weyerstahl, Peter, Liebigs Annalen der Chemie, 1982, # 1, p. 68 - 72
作者:Marschall, Helga、Penninger, Josef、Weyerstahl, Peter
DOI:——
日期:——
Elucidation of the regio- and chemoselectivity of enzymatic allylic oxidations with <i>Pleurotus sapidus</i> – conversion of selected spirocyclic terpenoids and computational analysis
作者:Verena Weidmann、Mathias Schaffrath、Holger Zorn、Julia Rehbein、Wolfgang Maison
DOI:10.3762/bjoc.9.262
日期:——
Allylic oxidations of olefins to enones allow the efficient synthesis of value-added products from simple olefinic precursors like terpenes or terpenoids. Biocatalytic variants have a large potential for industrial applications, particularly in the pharmaceutical and food industry. Herein we report efficient biocatalytic allylic oxidations of spirocyclic terpenoids by a lyophilisate of the edible fungus
Diastereoisomeric vitispiranes have been synthesized from 2,6,6-trimethyl-1-(3-oxo-1-butenyl)-1,3-cyclohexadiene by five-step reactions including photooxy-genation.