Inhibition of Lymphoid Tyrosine Phosphatase by Benzofuran Salicylic Acids
摘要:
The lymphoid tyrosine phosphatase (Lyp, PTPN22) is a critical negative regulator of T cell antigen receptor (TCR) signaling. A single-nucleotide polymorphism (SNP) in the ptpn22 gene correlates with the incidence of various autoimmune diseases, including type I diabetes, rheumatoid arthritis, and systemic lupus erythematosus. Since the disease-associated allele is a more potent inhibitor of TCR signaling, specific Lyp inhibitors May become valuable in treating autoimmunity. Using a structure-based approach, we synthesized a library of 34 compounds that inhibited Lyp with IC50 values between 0.27 and 6.2 mu M. A reporter assay was employed to screen for compounds that enhanced TCR signaling in cells, and several inhibitors displayed a dose-dependent, activating effect. Subsequent probing for Lyp's direct physiological targets by immunoblot analysis confirmed the ability of the compounds to inhibit Lyp in T cells. Selectivity profiling against closely related tyrosine phosphatases and in silico docking studies with the crystal structure of Lyp yielded valuable information for the design of Lyp-specific compounds.
handled one-pot synthetic procedure was previously developed for the synthesis of bisphosphinates starting from acyl chlorides. Herein, other trivalent derivatives as acid anhydrides and activated esters were tested to form various bisphosphinates. This modulation of the reactivity can be controlled according to the nature of the acid derivative for the use of sensitive and functionalized substrates
Antibacterial agents, and 4-thio azetidinone intermediates
申请人:Bristol-Myers Company
公开号:US04272437A1
公开(公告)日:1981-06-09
This invention relates to 2-substituted and 2,6-disubstituted penem compounds of the formula ##STR1## wherein Y is hydrogen, halo or certain organic substituents and X represents certain organic substituents. Also included in the invention are pharmaceutically acceptable salts of the above compounds and derivatives of the above compounds in which the carboxyl group at the 3-position is protected as by an easily removable ester protecting group. The compounds of the present invention are potent antibacterial agents or are of use as intermediates in the preparation of such agents.
A quick, efficient, one-pot, BF3·OEt2-mediated synthesis of substituted N-aryl lactams in good to excellent yields by reaction of various substituted arenes with a variety of ω-azido alkanoic acid chlorides at room temperature is reported.
High-throughput synthesis of azide libraries suitable for direct “click” chemistry and in situ screening
作者:Rajavel Srinivasan、Lay Pheng Tan、Hao Wu、Peng-Yu Yang、Karunakaran A. Kalesh、Shao Q. Yao
DOI:10.1039/b902338k
日期:——
building blocks (key components in clickchemistry). We report herein a highly robust and efficient strategy for high-throughput synthesis of a 325-member azide library. The method is highlighted by its simplicity and product purity. The utility of the library is demonstrated with the subsequent “click” synthesis of the corresponding bidentate inhibitors against PTP1B.
Synthesis and In vitro activities of a spacer-containing glycophospholipid ligand of a lipopolysaccharide receptor involved in endotoxin tolerance
作者:Daniel Charon、Michelle Mondange、Jean-François Pons、Karine Le Blay、Richard Chaby
DOI:10.1016/s0968-0896(98)00027-3
日期:1998.6
with tetrabenzyl pyrophosphate. Hydrogenation on a Pd on carbon catalyst permitted the isolation of 6-(6-aminohexanoyl)-2,3-dideoxy-2,3-di-[(R)-3-hydroxy-tetradecanamido ] -alpha-D-glucopyranose 1,4-diphosphate (PPDm2-B). In mouse macrophages, PPDm2-B enhanced the lipopolysaccharide (LPS)-dependent secretion of tumor necrosis factor alpha (TNF-alpha), and inhibited the LPS-induced desensitization of these