The present invention relates to novel oxazole compounds which act as PPAR&agr; and PPAR&ggr; agonists and are accordingly useful for the treatment of diseases modulated by PPAR&agr; and PPAR&ggr; such as diabetes.
Transition-metal-catalyzed reaction of diazocompounds, efficient synthesis of functionalized ethers by carbene insertion into the hydroxylic bond of alcohols
An Efficient catalytic synthesis of unsaturated ethers by carbeneinsertion (with diazoesters as carbene precursors) into the OH bond of unsaturated alcohols is reported. The regioselectivity for the OH insertion is high. However, depending on the catalyst counter-ions and the diazoester alkoxy group, addition to the unsaturated centre can be promoted to some extent, yielding then cyclopropyl and cyclopropenyl
Synthesis of oxacyclic carboxylic esters through ring closure of α-alkoxy ester free radicals
作者:Lucie D.M. Lolkema、Henk Hiemstra、Al Ayachi Al Ghouch、W. Nico Speckamp
DOI:10.1016/0040-4039(91)80366-e
日期:1991.3
Cyclizations of 1-methyoxycarbonyl-2-oxa-5-hexenyl (and related) radical intermediates, generated from phenylthio precursors, proceed in good yields and mainly lead to substituted 2-tetrahydrofurancarboxylic esters.
Compounds of formula I are provided
1
as well as pharmaceutically acceptable salts and esters thereof, wherein R
1
to R
8
, A, A
1
and n have the significance indicated in the specification.
提供了式I的化合物,以及其药用可接受的盐和酯,其中R1至R8,A,A1和n具有规范中指示的含义。
2,2,3-Trisubstituted Tetrahydrofurans and 2<i>H</i>-Tetrahydropyrans by Tandem Demethoxycarbonylation−Michael Addition Reactions
作者:Richard A. Bunce、Eric D. Dowdy、R. Shawn Childress、Paul B. Jones
DOI:10.1021/jo971600s
日期:1998.1.1
A tandem demethoxycarbonylation-Michael addition reaction has been developed as a synthetic route to highly functionalized five- and six-membered oxygen heterocycles. Methyl esters, activated toward decarboxylation by a C-2 ethoxycarbonyl group and tethered by a three- or four-atom chain to an acrylate Michael acceptor, have been prepared and used as the cyclization substrates. Treatment of these compounds