Structure–Activity Relationships of Lysophosphatidylserine Analogs as Agonists of G-Protein-Coupled Receptors GPR34, P2Y10, and GPR174
摘要:
Lysophosphatidylserine (LysoPS) is an endogenous lipid mediator generated by hydrolysis of membrane phospholipid phosphatidylserine. Recent ligand screening of orphan G-protein-coupled receptors (GPCRs) identified two LysoPS specific human GPCRs, namely, P2Y10 (LPS2) and GPR174 (LPS3), which, together with previously reported GPR34 (LPS1), comprise a LysoPS receptor family. Herein, we examined the structure-attivity relationships of a series of synthetic LysoPS analogues toward these recently deorphanized LysoPS,receptors, based on the idea that LysoPS can be regarded as consisting of distinct modules (fatty acid, glycerol, and L-Serine) connected by phosphodiester and ester linkages. Starting from the endogenous ligand (1-oleoyl-LysolPS, 1), we optimized the structure of each module and the ester linkage. Accordingly, we identified some structural requirements of each module for potency and for receptor subtype selectivity. Further assembly of individually structure-optimized modules yielded a series of potent and LysoPS receptor subtype-selective agonists, particularly for P2Y10 and GPR174.
The present invention provides phosphonate conjugates and methods of preparing the phosphonate conjugates so as to allow, for example, improved methods and compounds for modifying the surface of a nanoparticle to increase in vivo circulation times and targeted delivery performance.
Reaction of oxiranes with lithium: deoxygenation leading to olefins
作者:K.N. Gurudutt、B. Ravindranath
DOI:10.1016/s0040-4039(01)83943-5
日期:——
Mono-, di-, tri- and tetra-substituted epoxides undergo facile deoxygenation yielding olefins when treated with lithium in tetrahydrofuran. Aliphatic epoxides yield olefins with the same stereochemistry as the parent compound.
Pheromone, VII. Synthese von 1‐substituierten (
<i>Z</i>
)‐9‐Alkenen
作者:Hans Jürgen Bestmann、Werner Stransky、Otto Vostrowsky、Peter Range
DOI:10.1002/cber.19751081120
日期:1975.11
Es wird eine allgemeine Methode zur Darstellung von 1-substituierten (Z)-9-Olefinen durch stereoselektive Wittig-Reaktion beschrieben. Sie ermöglicht die Synthesevon Pheromonen und die systematische Abwandlung ihrer Strukturen. Die physiologische Wirksamkeit einiger auf diesem Wege erhaltener Verbindungen wird diskutiert.
Catalytic reductive deoxygenation of esters to ethers driven by hydrosilane activation through non-covalent interactions with a fluorinated borate salt
We report the catalytic and transition metal-free reductive deoxygenation of esters to ethers through the use of a hydrosilane and a fluorinated borate BArF salt as a catalyst. Experimental and theoretical studies support the role of noncovalent interactions between the fluorinated catalyst, the hydrosilane and the ester substrate in the reaction mechanism.
The present invention relates to lipid compounds and uses thereof. In particular, the compounds include a class of cationic lipids having an amine moiety, such as an amino-amine or an amino-amide moiety. The lipid compounds are useful for in vivo or in vitro delivery of one or more agents (e.g., a polyanionic payload or an antisense payload, such as an RNAi agent).