8-Polycycloalkyl-1,3-dipropylxanthines as potent and selective antagonists for A1-adenosine receptors
摘要:
With the aim of characterizing the hydrophobic interactions between xanthines and the A1 receptor site, 1,3-dipropyl-8-substituted xanthines were synthesized. Introduction of a quaternary carbon and the conformationally restricted cyclopentyl moiety into the 8-position of xanthines enhanced the adenosine A1 antagonism. 1,3-Dipropyl-8-(3-noradamantyl)xanthine (42) was identified to be a selective and the most potent A1 receptor antagonist reported to date. Under our structure-activity relationship, the 8-substituent of xanthine antagonists and the N6-substituent of adenosine agonists appears to bind to the same region of the A1 receptor.
Disclosed herein are KCNQ potassium channels modulators of formula (I)
wherein ring Z
1
, R
1
, p, R
3
, and R
4
are as defined in the specification. Compositions comprising such compounds; and methods for treating conditions and disorders using such compounds and compositions are also described.
Palladium-Catalyzed Double Activation and Arylation of 2° and 3° C(sp3)–H Bonds of the Norbornane System: Formation of a C–C Bond at the Bridgehead Carbon and Bridgehead Quaternary Stereocenter
作者:Srinivasarao Babu、Ramarao Parella
DOI:10.1055/s-0033-1341242
日期:——
Pd-catalyzed activation and direct arylation of both 2° and the bridgehead 3° (sp3) C–H bonds and an unprecedented C–C bond formation at the bridgehead carbon of the norbornane system are reported. The assembly of bridgehead-substituted norbornane frameworks having contiguous stereocenters was accomplished. X-ray crystal structure analysis of representative molecules unambiguously established the stereochemistry
据报道,Pd 催化的 2° 和桥头 3°(sp3)C-H 键的活化和直接芳基化以及在降冰片烷系统的桥头碳上形成了前所未有的 C-C 键。完成了具有连续立体中心的桥头取代降冰片烷骨架的组装。代表性分子的 X 射线晶体结构分析明确地建立了立体化学。
Synthesis and Identification of Novel Berberine Derivatives as Potent Inhibitors against TNF-α-Induced NF-κB Activation
作者:Yan-Xiang Wang、Lu Liu、Qing-Xuan Zeng、Tian-Yun Fan、Jian-Dong Jiang、Hong-Bin Deng、Dan-Qing Song
DOI:10.3390/molecules22081257
日期:——
A preliminary mechanism study revealed that all of them could inhibit TNF-α-induced NF-κB activation via impairing IκB kinase (IKK) phosphorylation as well as cytokines interleukin (IL)-6 and IL-8 induced by TNF-α. Therefore, the results provided powerful information on further structural modifications and development of BBR derivatives into a new class of anti-inflammatory candidates for the treatment
A Detailed Study of Antibacterial 3-Acyltetramic Acids and 3-Acylpiperidine-2,4-diones
作者:Yong-Chul Jeong、Zsolt Bikadi、Eszter Hazai、Mark G. Moloney
DOI:10.1002/cmdc.201402093
日期:2014.5.18
Inspired by the core fragment of antibacterial natural products such as streptolydigin, 3‐acyltetramic acids and 3‐acylpiperidine‐2,4‐diones have been synthesised from the core heterocycle by direct acylation with the substituted carboxylic acids using a strategy which permits ready access to a structurally diverse compound library. The antibacterial activity of these systems has been established against
Addition of Carboxyalkyl Radicals to Alkenes through a Catalytic Process, Using a Mn(II)/Co(II)/O<sub>2</sub> Redox System
作者:Koji Hirase、Satoshi Sakaguchi、Yasutaka Ishii
DOI:10.1021/jo034584+
日期:2003.7.1
production of mono- and dicarboxylic acids by the addition of carboxyalkyl radicals to alkenes and dienes, respectively, was successfully developed through a catalytic process with use of Mn(II)/Co(II)/O(2) system. Thus, a variety of carboxylic acids were prepared by the reaction of alkenes and dienes with acid anhydrides in the presence of a very small amount of Mn(OAc)(2) (0.5 mol %) and Co(OAc)(2)