Potent Kv1.3 inhibitors from correolide—modification of the C18 position
摘要:
Kv1.3, the voltage-gated potassium channel in human T cells, represents a new target for treating immunosuppression and autoimmune diseases. Correolide (1), a pentacyclic natural product, is a potent and selective Kv1.3 channel blocker. Simplification of correolide via removal of its E-ring generates enone 4, whose modification produced a new series of tetracyclic Kv1.3 blockers. The structure-activity relationship for this class of compounds in two functional assays, Rb_Kv and human T cell proliferation, is presented herein. The most potent analog 43 is 15-fold more potent than correolide as inhibitor of human T cell proliferation. (C) 2004 Elsevier Ltd. All rights reserved.
formation of homocoupled alkane byproducts have been identified in the reduction of bromoalkanes via photoredoxgold catalysis with dimeric Au(I) complexes. This prompted further investigation into the mechanism of formation of these byproducts and the diversity of C–X bonds amenable to this transformation. Examples were found when considering bromoalkanes while a wide variety of iodoarenes underwent this
Tethered ruthenium(II) η6-arene complexes: assessing the potential of benzylic substituents to control metal-centred chirality, and applications in asymmetric transfer hydrogenations of ketones
作者:Stephanie Shroot、Timothy J. Prior、Charlotte Wiles、Benjamin S Murray
DOI:10.1016/j.jorganchem.2021.122232
日期:2022.2
of a small series of tethered ruthenium(II) η6-arene complexes is described, where a single benzylic substituent is examined as a route to enforcing chirality at the metal centre upon ligation of a tethered bidentate ligand. The application of these complexes as catalysts in the asymmetric transferhydrogenation of ketones is described, with moderate enantioselectivities confirming the validity of the
描述了小系列系留钌 (II) η 6 -芳烃配合物的合成和表征,其中检测单个苄基取代基作为在连接系留双齿配体时在金属中心增强手性的途径。描述了这些配合物作为催化剂在酮的不对称转移氢化中的应用,适度的对映选择性证实了该方法的有效性。
Tetracyclic triterpene derivatives with immunosuppressant activity
申请人:Merck & Co., Inc.
公开号:US06100293A1
公开(公告)日:2000-08-08
The compounds of Formula I ##STR1## are useful as immunosuppressive agents.
or M) in the corresponding hydrogen-bondedassemblies 1(3).(CA)(6) (de>98 %). The high degree of chiral induction results from the presence of six chiral centers in close proximity (C(alpha)) to the core of the assembly. A much lower level of chiral induction is observed for assemblies with chiral centers that are more remote (C(beta)). All diastereomerically pure assemblies 1(3).(CA)(6) exhibit very
杯[4]芳烃1的二蜜胺组分中或氰尿酸酯组分CA中存在的手性中心在相应的氢键键合组件1(3)。(CA)(6)(de)中定量诱导一种惯性(P或M)。 > 98%)。高度的手性诱导是由于六个手性中心(Cα)与装配体的核心非常接近。对于具有更远的手性中心(Cβ)的装配体,观察到了更低的手性诱导水平。所有非对映体纯组装1(3)。(CA)(6)都显示出非常高的CD活性(deltavarepsilon(max)约100 L mol(-1)cm(-1)),与低CD活性(deltavarepsilon (最大)
Crombie,L. et al., Journal of the Chemical Society. Perkin transactions I, 1975, p. 1090 - 1099