Structural Diversity from the Transannular Cyclizations of Natural Germacrone and Epoxy Derivatives: A Theoretical-Experimental Study
作者:M. Carmen Pérez Morales、Julieta V. Catalán、Victoriano Domingo、Martín Jaraíz、M. Mar Herrador、José F. Quílez del Moral、José-Luis López-Pérez、Alejandro F. Barrero
DOI:10.1002/chem.201300662
日期:2013.5.17
Treatment of germacrone (1) with different electrophiles, and of its epoxyderivativesgermacrone‐4,5‐epoxide (2), germacrone‐1,10‐epoxide (3) and isogermacrone‐4,5‐epoxide (4) with Brönsted/Lewis acids and TiIII, gives rise to a great structuraldiversity. Thus, by using a maximum of two steps, the production of more than 40 compounds corresponding to 14 skeletons is described. Computational calculations
Transannular cyclisation of germacrone and isogermacrone via oxymercuration-demercuration
作者:E. Tsankova、I. Ognyanov、T. Norin
DOI:10.1016/0040-4020(80)88012-4
日期:1980.1
Germacrone 1 undergoes transannularcyclisation by OM-DM yielding the trans-decalin derivatives 3,4 and 5. Isogermacrone 2 similarly yields 3, 4 and 5 and, as a minor product, the ketone 8. The stereochemistry and the mechanism of the intramolecular olefinic cyclisation are discussed.
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
A total synthesis of (+/-)-cuauhtemone (9) was achieved bg utilising the isopr
Sesquiterpenoids from the liverwort Bazzania fauriana
作者:Masao Toyota、Yoshinori Asakawa
DOI:10.1016/0031-9422(88)80116-x
日期:1988.1
Abstract Four new sesquiterpenoids, bazzanenyl caffeate, drimenyl caffeate, 6β-hydroxyeudesm-3-ene and 7α-valenc-1(10)-ene have been isolated from the liverwort Bazzania fauriana and their structures determined by chemical transformation and extensive NMR spectral experiments. The present species belongs to the new chemotype of Bazzaniaspecies. Part 26 in the series of ‘Chemosystematics of Bryophytes’