Pairs of the skeletal isomers of eremophilane-type lactones were synthesized from furanofukinol via photosensitized oxygenation, followed by lactone cleavage and reformation. Their stereochemistry has been clarified so as to be consistent with a classification method outlined in our earlier papers.
Furanoeremophilanes from Petasites niveus: High solvolytic reactivity at the C-6β position bearing an α,β-unsaturated ester group
作者:Antonio Guerriero、Francesco Pietra
DOI:10.1016/0031-9422(80)85061-8
日期:1980.1
Rhizomes and roots of Petasitesniveus gave some new cis -fused, unstable furanoeremophilanesbearing the senecioyloxy group either at C-2β or at C-3β and C-6β, besides the known, unstable 2β-pangeloyloxy-10β-H-furanoeremophilane (furanojaponin) and 3β,6β-diangeloyloxy-10β-H-furanoeremophilane. The senecioyloxy or angeloyloxy group at C-6 was easily replaced in alcohols, by the alkoxyl group, leading in medium