Highly stereoselective total syntheses of (+)-pachydictyol A and (-)-dictyolene, novel marine diterpenes from brown seaweeds of the family dictyotaceae
Highly stereoselective total syntheses of (+)-pachydictyol A and (-)-dictyolene, novel marine diterpenes from brown seaweeds of the family dictyotaceae
Synthesis (in ent-form) of a novel jalcaguaianolide from Ferula arrigonii Bocchieri
作者:Philippe Delair、Nina Kann、Andrew E. Greene
DOI:10.1039/p19940001651
日期:——
A recently isolated isodehydrocostus lactone from the genus Ferula(Umbelliferae) has been stereoselectively prepared in ent-form from α-santonin by photochemicaltransformation to O-acetylisophotosantonic lactone followed by functional group manipulations that conclude with a one-step γ-butyrolactone →Δα,β-butenolide conversion; the synthesis corroborates both the structure and the relative and absolute
Barton et al., Journal of the Chemical Society, 1957, p. 929,934
作者:Barton et al.
DOI:——
日期:——
Ultrasound assisted reductive cleavage of eudesmane and guaiane γ-enonelactones. Synthesis of 1α,7α,10αH-guaian-4,11-dien-3-one and hydrocolorenone from santonin
作者:Gonzalo Blay、Victoria Bargues、Luz Cardona、Begoña Garcı́a、José R Pedro
DOI:10.1016/s0040-4020(01)00986-3
日期:2001.11
Ultrasound enhances the rate of reductive cleavage of the C-6-oxygen bond of sesquiterpene enonelactones. trans-Eudesmanolides 1c-1g, cis-eudesmanolides 2a-2c, and trans-guaianolides 4a-4d react with Zn in acetic acid-H2O under sonochemical conditions to afford the corresponding sesquiterpene. acids 3a-3g and 5a-5d, respectively in good yields. Starting from 5d two natural guaianes 1 alpha ,7 alpha ,10 alphaH-guaian-4, 11-dien-3-one (6) and hydrocolorenone (7) have been prepared in good yields through a straightforward sequence. (C) 2001 Elsevier Science Ltd. All rights reserved.