作者:Timothy J. Donohoe、Peter R. Moore、Michael J. Waring、Nicholas J. Newcombe
DOI:10.1016/s0040-4039(97)01061-7
日期:1997.7
The preparation and dihydroxylation of a series of polyenes and cyclicallylicalcohols using the TMEDA/osmium tetroxide mixture is reported. Remarkably, these reagents lead to high levels of regiochemical and stereochemical control as the oxidant hydrogen-bonds to the allylicalcohol group. A mechanistic hypothesis is presented which invokes the formation of a reactive, bidentate complex between osmium
The Absolute Configuration of 1-(3‘,4‘-Dihydroxycinnamoyl)cyclopentane-2,3-diol from the Amazonian Tree <i>Chimarrhis </i><i>t</i><i>urbinata</i>
作者:Carmen Lucia Cardoso、Vanderlan da Silva Bolzani、Dulce Helena Siqueira Silva、Hideki Ishii、Nina Berova、Koji Nakanishi
DOI:10.1021/np050522y
日期:2006.7.1
4'-dihydroxyphenyl)acrylate (1)], and two known trans- and cis-chlorogenic acid methyl esters were isolated from the ethanolic extract of the leaves of Chimarrhis turbinata. The relative configuration of 1 was determined by NMR and by comparison of the circular dichroic spectrum (CD) with those of the enantiomers of synthetic 3',4'-dimethoxycinnamoyl analogues. The absolute configuration of one of