Inhibition of Protein Kinase Cα by Dequalinium Analogues: Dependence on Linker Length and Geometry
摘要:
Analogues of a bipartite compound, dequalinium (DECA) (quinolinium, 1,1'-(1,10-decanediyl)bis(4-amino-2-methyl diiodide)), were tested for inhibition of protein kinase C alpha (PKC alpha). In vitro assays of monomeric and dimeric analogues support a model in which DECA inhibits PKC alpha by an obligatory two-point contact, a unique mechanism among PKC inhibitors. The presence of unsaturation in the center of the C-10-alkyl linker produced geometric isomers with different inhibitory potencies: cis IC50 = 52 +/- 12 mu M and trans IC50 = 12 +/- 3 mu M, where the trans isomer was equipotent to that of the saturated C-10-DECA. DECA analogues with longer, saturated linkers (C-12, C-14, or C-16) exhibited enhanced inhibitory potencies which reached a plateau with the C-14-linker (IC50 = 2.6 +/- 0.2 mu M) Metastatic melanoma cells treated with 250 nM C-12-, C-14-, or C-16-DECA and irradiated with long-wave UV light (which causes irreversible inhibition of PKC alpha by DECA) confirmed the linker-dependent inhibition of intracellular PKC alpha activity.
A step‐ and redox‐economic route toward aminoallenes from simplealkynes and N‐fluorobenzenesulfonimide (NFSI) was established viaselenium‐π‐acid catalysis. This unprecedented method significantly streamlines the assembly of heterosubstituted 1,3‐propadiene motifs and is characterized by a broad functional group tolerance.
Stoichiometric and Catalytic (η
5-Cyclopentadienyl)cobalt-Mediated Cycloisomerizations of Ene-Yne-Ene Type Allyl Propargyl Ethers
作者:Chu-An Chang、Stefan Gürtzgen、Erik P. Johnson、K. Peter C. Vollhardt
DOI:10.1055/s-0039-1690727
日期:2020.2
CO or CH2=CH2) mediate the cycloisomerizations of α,δ,ω-enynenes containing allylic ether linkages to 3-(oxacyclopentyl or cycloalkyl)furans via the intermediacy of isolable CpCo-η 4-dienes. A suggested mechanism comprises initial complexation of the triple bond and one of the double bonds, then oxidative coupling to a cobalt-2-cyclopentene, terminal double bond insertion to assemble a cobalta-4-cycloheptene
配合物CpCoL 2(Cp = C 5 H 5; L = CO或CH 2 = CH 2)介导含有烯丙基醚键的α,δ,ω-烯炔的环异构化反应,通过以下反应介导到3-(氧杂环戊基或环烷基)呋喃可分离CpCo- η 4个-dienes。建议的机理包括三键和双键之一的初始络合,然后氧化偶联至钴2-环戊烯,末端双键插入以组装钴-4-环庚烯,β-氢化物消除,以及还原消除为配料一个CpCo- η 4-二烯。在可能的情况下,级联反应通过钴介导的氢化物转移和芳族呋喃环的解离而继续进行。氘标记实验的结果支持了这一假设。该反应显示出可变的立体选择性与用于偏好反式-产物(或被捕时,其顺式-Me CpCo- η 4 -二烯前体),但是在箱子完全区域选择性,其中两个取代基炔由存在电子分化或没有嵌入的氧气。区域选择性也可通过空间辨别或阻断两种可能的β-氢化物消除途径之一来实现。当通过这种区域控制避免了呋喃形成时,该序列以稳定的CpCo-
Discovery of Novel
<scp>Long‐Chain</scp>
Alkenyl Diacid Derivatives as
<scp>ACLY</scp>
Inhibitors
作者:Gao‐Lei Song、Lei Cao、Mei Zhang、Yu‐Rou Yang、Jie Ma、Zhi‐Fu Xie、Jing‐Ya Li、Fa‐Jun Nan
DOI:10.1002/cjoc.202200362
日期:2022.11.15
the FDA as an additional therapeutic option in high-risk hypercholesterolemia patients unable to meet goals with standard therapy. In this work, we identified a series of novel long-chain alkenyl diacids as potent direct ACLY inhibitors, and comprehensive structure-activity relationship analysis showed that compound 18f was the most potent ACLY inhibitor with an IC50 value of 1.5 μmol/L. Subsequent
ATP 柠檬酸裂解酶 (ACLY) 合成胞质乙酰辅酶 A (乙酰辅酶 A),这是脂质合成的重要生物合成前体和蛋白质乙酰化所需的乙酰供体。ACLY 的异常表达和活性已在多种人类癌症中得到证实。ETC-1002 是一种间接 ACLY 抑制剂,最近被 FDA 批准作为标准治疗无法达到目标的高危高胆固醇血症患者的额外治疗选择。在这项工作中,我们确定了一系列新型长链烯基二酸作为有效的直接 ACLY 抑制剂,综合构效关系分析表明化合物 18f 是最有效的 ACLY 抑制剂,IC 50值为 1.5 μmol/L。随后 18f 的酯形成产生了一系列新的化合物,例如 25f,它们保持了 ACLY 抑制活性并改善了抗肿瘤细胞增殖作用。
Stereospecific cobalt-mediated enediyne cyclization involving a tetrasubstituted double bond: one-step construction of the hydrophenanthrene nucleus incorporating two adjacent quaternary centers
作者:Max Malacria、K. Peter C. Vollhardt
DOI:10.1021/jo00199a056
日期:1984.12
MALACRIA, M.;VOLLHARDT, K. P. C., J. ORG. CHEM., 1984, 49, N 25, 5010-5012