Zinc-promoted reactions. Part 5. The behaviour of alkyl substituted 1,3-diketones
摘要:
The zinc-promoted reaction of 2,4-pentanedione and related beta-dicarbonyl substrates have been investigated under a variety of conditions. The results were explained according to a general mechanism, involving ionic and nonionic pathways.
Compounds that have agonist activity at one or more of the SlP receptors are provided. The compounds are sphingosine analogs that, after phosphorylation, can behave as agonists at SlP receptors.
[EN] S1P MODULATING AGENTS<br/>[FR] AGENTS MODULATEURS DE S1P
申请人:BIOGEN IDEC INC
公开号:WO2014120764A1
公开(公告)日:2014-08-07
Compounds of formula (I) can modulate the activity of one or more S 1P receptors. Sphingosine 1-phosphate (S IP) is a lysophospholipid mediator that evokes a variety of cellular responses by stimulation of five members of the endothelial cell differentiation gene (EDG) receptor family, namely S1P1, S1P2, S1P3, S1P4, and S1P5 (formerly EDG1, EDG5, EDG3, EDG6 and EDG8). The EDG receptors are G-protein coupled receptors (GPCRs) and on stimulation propagate second messenger signals via activation of heterotrimeric G-protein alpha (Ga.) subunits and beta-gamma (G()y) dimers.
S1P5 is one of the five sphingosine-1-phosphate (S1P) receptors which play important roles in immune and CNS cell homeostasis, growth, and differentiation. Little is known about the effect of modulation of S1P5 due to the lack of S1P5 specific modulators with suitable druglike properties. Here we describe the discovery and optimization of a novel series of potentselectiveS1P5 antagonists and the
Divergent Diels–Alder methodology from methyl coumalate toward functionalized aromatics
作者:Jennifer J. Lee、George A. Kraus
DOI:10.1016/j.tetlet.2013.02.083
日期:2013.5
An inverseelectron-demandDiels–Alderreaction between methyl coumalate and electron-rich dienophiles produces substituted benzoates. A high-yielding, single-pot procedure transforms readily accessible vinylether, ketal, or orthoester dienophiles into functionalized aromatic systems in a versatile route.