A radical-mediated oxidative cross-coupling of readily accessible α-alkylated styrenes with 1,3-dicarbonyl compounds utilizing a combination of Cu(OAc)2 and air as a catalytic system is described. Rather than requiring α-halocarbonyl compounds, this efficient approach enables direct installation of tertiary functionalized alkyl motifs to olefins with simple carbonyl derivatives. The novel protocol
highly effective C−O coupling reaction of (hetero)aryl electrophiles with primary and secondary alcohols is reported. Catalyzed by a NiII‐arylcomplex under long‐wave UV (390–395 nm) irradiation in the presence of a soluble amine base without any additional photosensitizer, the reaction enables the etherification of aryl bromides and arylchlorides as well as sulfonates with a wide range of primary
据报道,(杂)芳基亲电试剂与伯醇和仲醇的高效C-O偶联反应。在可溶性胺碱的存在下,在没有任何其他光敏剂的情况下,在长波紫外线(390–395 nm)辐射下,由Ni II-芳基络合物催化,该反应可以使芳基溴化物和芳基氯化物以及磺酸盐与多种伯和仲脂族醇,可提供合成上重要的醚。分子内CO偶联也是可能的。该反应似乎通过Ni I -Ni III催化循环进行。
General Paradigm in Photoredox Nickel‐Catalyzed Cross‐Coupling Allows for Light‐Free Access to Reactivity
作者:Rui Sun、Yangzhong Qin、Daniel G. Nocera
DOI:10.1002/anie.201916398
日期:2020.6.8
Self‐sustained NiI/III cycles are established as a potentially generalparadigm in photoredox Ni‐catalyzed carbon–heteroatom cross‐coupling reactions through a strategy that allows us to recapitulate photoredox‐like reactivity in the absence of light across a wide range of substrates in the amination, etherification, and esterification of aryl bromides, the latter of which has remained, hitherto, elusive
自我维持的Ni I / III循环被确立为光氧化还原Ni催化的碳-杂原子交叉偶联反应中的潜在一般范式,其策略是使我们能够在没有光的情况下在各种各样的底物上重现类似光氧化还原的反应性。在芳基溴化物的胺化,醚化和酯化反应中,迄今为止,后者在热镍催化下仍然难以捉摸。此外,在没有光照的情况下酯化的可及性尤其显着,因为先前在光氧化还原条件下对该转化进行的机理研究一致地调用了能量转移介导的途径。
[EN] SMALL MOLECULE ANTAGONISTS OF SUMO RELATED MODIFICATION OF CRMP2 AND USES THEREOF<br/>[FR] ANTAGONISTES À PETITES MOLÉCULES DE LA MODIFICATION LIÉE AU SUMO DE CRMP2 ET LEURS UTILISATIONS
申请人:UNIV ARIZONA
公开号:WO2018144900A1
公开(公告)日:2018-08-09
This invention is in the field of medicinal chemistry. In particular, the invention relates to a new class of small-molecules having a piperidinyl-benzoimidazole structure which function as antagonists of small ubiquitin like modifier (SUMO) related modification (SUMOylation) of collapsin response mediator protein 2 (CRMP2), and their use as therapeutics for the treatment of voltage gated sodium channel 1.7 (Nav1.7) related itch, anosmia, migraine event, and/or pain (e.g., neuropathic pain).
Switching on elusive organometallic mechanisms with photoredox catalysis
作者:Jack A. Terrett、James D. Cuthbertson、Valerie W. Shurtleff、David W. C. MacMillan
DOI:10.1038/nature14875
日期:2015.8
step) to occur via a Ni(iii) alkoxide intermediate. Here we demonstrate that visible-light-excited photoredox catalysts can modulate the preferred oxidation states of nickel alkoxides in an operative catalytic cycle, thereby providing transient access to Ni(iii) species that readily participate in reductive elimination. Using this synergistic merger of photoredox and nickel catalysis, we have developed