A New Approach to the Nazarov Reaction via Sequential Electrocyclic Ring Opening and Ring Closure
作者:Tina N. Grant、F. G. West
DOI:10.1021/ja063421a
日期:2006.7.1
furnishes vinylcyclopropanol silyl ethers in good yield. Treatment with silver(I) at room temperature effects disrotatory electrocyclic opening to a 2-chloro-3-silyloxypentadienyl cation, which then undergoes conrotatory (Nazarov) electrocyclization to provide chlorocyclopentenones. This two-step sequence offers a convenient and mild alternative to the standard Nazarovcyclization protocol via a formal 4+1
Synthesis of Cyclopentenediolates and Cyclopentane-1,2-diones by Carbonylation of Titanacyclobutane Complexes Prepared by Free Radical Alkylation
作者:Charles A. G. Carter、Gary L. Casty、Jeffrey M. Stryker
DOI:10.1055/s-2001-14658
日期:——
The synthesis of titanium cyclopentenediolates by the double carbonylation of titanacyclobutane complexes is reported, a process known as the Bercaw carbonylation. The reaction is general for a range of titanacyclobutanes prepared by free radical alkylation of allyltitanium(III) precursors. Titanacyclobutane formation and carbonylation can be conducted in one pot without the isolation of sensitive intermediates. Subsequent conversion to lithium cyclopentenediolates and cyclopentane-1,2-diones provides access to a range of synthetically valuable organic products.
The present invention relates to sulfonamide-, sulfinamide- or sulfonimidamide containing compounds which bind to the liver X receptor (LXRa and/or LXRβ) and act preferably as inverse agonists of LXR.
AMINE OR (THIO)AMIDE CONTAINING LXR MODULATORS
申请人:Phenex-FXR GmbH
公开号:US20200131144A1
公开(公告)日:2020-04-30
The present invention relates to derivatives of formula (I) which bind to the liver X receptor (LXRα and/or LXRβ) and act preferably as inverse agonists of LXR.
Arnarp; Enzell; Petersson, Acta chemica Scandinavica. Series B: Organic chemistry and biochemistry, 1986, vol. 40, # 10, p. 839 - 854