Synthesis and evaluation of 2-{[2-(4-hydroxyphenyl)-ethyl]amino}pyrimidine-5-carboxamide derivatives as novel STAT6 inhibitors
摘要:
The STAT6 (signal transducers and activators of transcription 6) protein is activated by interleukin (IL)-4 and IL-13, and plays an important role in T-helper cell 2 (Th2) differentiation. STAT6 might therefore be an excellent therapeutic target for various allergic conditions, including asthma and atopic diseases. We synthesized a series of 2-{[2-(4-hydroxyphenyl)ethyl]amino}pyrimidine-5-carboxamide derivatives and evaluated their STAT6 inhibitory activities. Among these compounds, 4-(benzylamino)-2-{[2-(3-chloro-4-hydroxyphenyl)ethyl]amino}pyrimidine-5-carboxamide (2t, AS1517499) showed potent STAT6 inhibition with an IC50 value of 21 nM, and also inhibited IL-4-induced Th2 differentiation of mouse spleen T cells with an IC50 value of 2.3 nM and without influencing T-helper cell 1 (Th1) differentiation induced by IL-12. (c) 2006 Elsevier Ltd. All rights reserved.
C(sp<sup>3</sup>)–H bond functionalization with styrenes <i>via</i> hydrogen-atom transfer to an aqueous hydroxyl radical under photocatalysis
作者:Shogo Mori、Susumu Saito
DOI:10.1039/d1gc00753j
日期:——
of α-C–H bonds of acetonitrile and acetone to styrenes was enabled via the hydrogen-atom transfer from relatively acidic and water-miscible C(sp3)–H bonds to an aqueous hydroxyl radical generated cleanly and iteratively by the oxidation of water under silver-nanoparticle-loaded titania photocatalysis without using stoichiometric oxidation agents.
the assistance of appropriate directing groups, low-valent titanium was found to homolytically cleave non-strained C–O bonds. In particular, a newly designed catechol monoether directing group rendered a route toward the activation of non-benzylic C(sp3)–O bonds. This method has been applied to conventional radicaladdition reactions to alkenes.