Stereoselective first total synthesis of (4S)-trans-β-elemenone was achieved from (S)-2-cyclohexen-1-ol, prepared easily by the asymmetric reduction of 2-cyclohexen-1-one with chiral hydride reagent.
One-Step Synthesis of Furan Rings from α-Isopropylidene Ketones Mediated by Iodine/DMSO: An Approach to Potent Bioactive Terpenes
作者:Jonida Salihila、Lúcia Silva、Helena Pérez del Pulgar、Ana Quílez Molina、Azucena González-Coloma、A. Sonia Olmeda、José F. Quílez del Moral、Alejandro F. Barrero
DOI:10.1021/acs.joc.9b00704
日期:2019.6.7
transformation of α-isopropylidene ketones into furan rings following a biomimetic approach. This methodology has been used for the synthesis of terpene furans such as mintfurane, curzerene, atractylon, and isoatractylon, all of them possessing interesting biological activities. The synthesis of linderazulene directly from 4,5-epoxygermacrone via a cascade reaction shows the potential of this protocol
Abnormal Cope rearrangement of cis,trans-cyclodeca-1,5-diene derivatives with a furan ring
作者:Ken'ichi Takeda、I. Horibe、H. Minato
DOI:10.1039/c29710000088
日期:——
The abnormalCoperearrangement of cis,trans-furanodiene (I) and neolinderalactone (II) is caused not by the methyl groups on the double bonds at C-1 and C-5, but by the furanring.
Ohloff et al., Justus Liebigs Annalen der Chemie, 1959, vol. 625, p. 206,222
作者:Ohloff et al.
DOI:——
日期:——
The use of 4,4-disubstituted nopinones for natural-product synthesis. Synthesis of elemanoid sesquiterpenes
作者:Michiharu Kato、Masataka Watanabe、Bernhard Vogler、Bahlul Z. Awen、Yoshiaki Masuda、Youichi Tooyama、Akira Yoshikoshi
DOI:10.1021/jo00025a023
日期:1991.12
A general and convenient synthetic route to 4,4-disubstituted nopinones 14 from (+)-nopinone (1) is developed and applied to the asymmetric synthesis of some representative elemanoid sesquiterpenes. Phenylsulfenylation of 1 provided sulfide 6 in high yield. A convenient transformation of 6 to 3-(phenylsulfonyl)-4,4-disubstituted-nopinones 13 was accomplished by (i) m-CPBA oxidation of a sulfide compound followed by the Pummerer rearrangement and (ii) the conjugate addition of carbon nucleophiles to the resulting enones, 6 --> 8 --> 9 and 9 --> 10,11 --> 13. Subsequent reductive desulfurization of the adducts 13 provided 14 in good overall yield from 1. Bicyclic ketones 14 are envisioned as promising intermediates for natural product synthesis. As examples, syntheses of two elemanoid sesquiterpenes, beta-elemenone (16) and eleman-8-beta,12-olide (17) in optically active form from (1R,4S,5S)-4,6,6-trimethyl-4-vinylbicyclo[3.1.1]heptan-2-one (14a) were carried out.