Conformationally Constrained Analogues of Diacylglycerol. 10. Ultrapotent Protein Kinase C Ligands Based on a Racemic 5-Disubstituted Tetrahydro-2-furanone Template
摘要:
5,5-Bis(hydroxymethyl)tetrahydro-2-furanone and its isomer 4,4-bis(hydroxymethyl)tetrahydro-2-furanone were investigated as possible templates for the construction of conformationally constrained analogues of the biologically important second messenger, diacylglycerol (DAG). The former lactone contains embedded within its structure an exact glycerol moiety, while in the latter the ring oxygen has been transposed to the other side of the carbonyl group. Al target compounds were synthesized as racemates from 1,3-dihydroxy-2-propanone. The 5,5-bis(hydroxymethyl)tetrahydro-2-furanone proved to be the better template for the construction of DAG surrogates that were demonstrated to have high binding affinities for the biological target, protein kinase C (PK-C). The simplest target compounds derived from this template (3e and 3f) have one of the hydroxyl moieties functionalized either as a myristate or as an oleate ester. The simplest target compound (9e) derived from the ineffective 4,4-bis(hydroxymethyl)tetrahydro-2-furanone template was investigated only with a myristoyl acyl chain. Reducing the long acyl chain to an acetyl moiety and attaching a compensating lipophilic chain to the lactone ring as an alpha-alkylidene moiety produced compounds 10e and 10f(Z-isomers) and 11e and 11f(E-isomers), which were constructed on the more effective 5,5-bis(hydroxymethyl)tetrahydro-2-furanone template. Targets 14c (Z-isomer) and 15c (E-isomer) were derived, in turn, from 4,4-bis(hydroxymethyl)tetrahydro-2-furan. The affinities of these ligands for PK-C were assessed in terms of their ability to displace bound [H-3-20]phorbol 12,13-dibutyrate (PDBU) from the single isozyme PK-C alpha. The biological data support the hypothesis that the increase in binding affinity for PK-C shown by some of these constrained DAG mimetics appears to be entropic in nature. Two of the designed ligands (10e and 10f) showed the highest affinities (34 and 24 nM, respectively) reported so far for a DAG analogue. Assuming that the interaction between these racemic compounds and PK-C is stereospecific, the potency of the active enantiomer is anticipated to double.
Site-Selective and Stereoselective C–H Alkylations of Carbohydrates via Combined Diarylborinic Acid and Photoredox Catalysis
作者:Victoria Dimakos、Hsin Y. Su、Graham E. Garrett、Mark S. Taylor
DOI:10.1021/jacs.9b01531
日期:2019.4.3
Diphenylborinic acid serves as a cocatalyst for site- and stereoselective C-H alkylation reactions of carbohydrates under photoredox conditions using quinuclidine as the hydrogen atom transfer mediator. Products arising from selective abstraction of the equatorial hydrogens of cis-1,2-diol moieties, followed by C-C bond formation with net retention of configuration, are obtained. Computational modeling supports
二苯基硼酸在光氧化还原条件下用作碳水化合物的位点和立体选择性 CH 烷基化反应的助催化剂,使用奎宁环作为氢原子转移介体。获得了选择性提取顺式 1,2-二醇部分的赤道氢,然后形成 CC 键并保留构型的产物。计算模型支持涉及形成四配位硼酸酯的机制,该机制通过极性匹配和/或离子配对效应加速氢原子与奎宁环衍生的自由基阳离子的转移。
申请人:The United States of America as represented by the Department of Health
公开号:US05874464A1
公开(公告)日:1999-02-23
Conformationally constrained diacylglycerol analogues, pharmaceutical compositions comprising such analogues, and methods of using such analogues as agonists and antagonists of protein kinase C.
Photocatalyzed Carbon−Carbon Bond Formation Between Glycerol and Electron‐Deficient Olefins
作者:Kassem El‐Chami、Robert Madsen
DOI:10.1002/cctc.202301143
日期:2023.12.19
Valorization of glycerol can be achieved by photocatalytic coupling at C2 with electron-deficient olefins. With [Ir(dF(CF3)ppy)2(dtbpy)]PF6 as the photocatalyst (PC) coupling to acrylates can be performed while (Bu4N)4W10O32 as the photocatalyst allows for further coupling to fumaronitrile, N-methyl maleimide and itaconic anhydride.
甘油的增值可以通过在C2处与缺电子烯烃的光催化偶联来实现。使用[Ir(dF(CF 3 )ppy) 2 (dtbpy)]PF 6作为光催化剂(PC)可以与丙烯酸酯偶联,而(Bu 4 N) 4 W 10 O 32作为光催化剂则可以进一步与富马腈偶联,N-甲基马来酰亚胺和衣康酸酐。
Photoredox‐Catalyzed α−C−H Monoalkylation of Symmetric Polyols in the Presence of CO<sub>2</sub>
The transient carbonation of polyols under a CO2 atmosphere enables their C−H monoalkylation by photoredox catalysis. This reactivity results from an unprecedented C−H activation through intramolecular hydrogen bonding.
DIACYLGLYCEROL LACTONE COMPOUND, PREPARATION METHOD THEREFOR, AND IMMUNOSTIMULATOR CONTAINING SAME AS ACTIVE INGREDIENT
申请人:Enzychem Lifesciences Corporation
公开号:EP3750882A1
公开(公告)日:2020-12-16
Disclosed are a novel diacylglycerol lactone compound that promotes neutrophil migration to enhance immunity and inhibit infection, a method for preparing the same, and an immunostimulator containing the same as an active ingredient. The diacylglycerol lactone compound is represented by Chemical formula 1 in the specification. In Chemical formula 1, R1 and R2 are independently a fatty acid residue of 2 to 30 carbon atoms.