[EN] NOVEL COMPOUNDS WITH A 3A-AZABICYCLO [4.1.0] HEPTANE CORE ACTING ON OREXIN RECEPTORS [FR] NOUVEAUX COMPOSÉS DOTÉS D'UN COEUR 3A-AZABICYCLO[4.1.0]HEPTANE AGISSANT SUR LES RÉCEPTEURS D'OREXINE
Copper-Mediated Perfluoroalkylation of Heteroaryl Bromides with (phen)CuR<sub>F</sub>
作者:Michael G. Mormino、Patrick S. Fier、John F. Hartwig
DOI:10.1021/ol500422t
日期:2014.3.21
synthetic goal over the past several decades. Previously, our group reported phenanthroline-ligated perfluoroalkyl copperreagents, (phen)CuRF, which react with aryliodides and aryl boronates to form the corresponding benzotrifluorides. Herein the perfluoroalkylation of a series of heteroaryl bromides with (phen)CuCF3 and (phen)CuCF2CF3 is reported. The mild reaction conditions allow the process to tolerate
The aromatic perfluoroalkylation catalyzed by a copper(I) salt with bis(perfluoroalkyl)zinc reagents Zn(RF)2(DMPU)2, which were prepared and then isolated as a stable white powder from perfluoroalkyl iodide and diethylzinc, was accomplished to provide the perfluoroalkylated products in good‐to‐excellent yields. The advantages of this reliable and practical catalytic reaction are 1) air‐stable and easy‐to‐handle
prepared and tested as simple catalysts of oxidations with hydrogen peroxide, using sulfoxidation as a model reaction. Their catalyticefficiency strongly depends on the type of substituent and is remarkable for derivatives with an electron-withdrawing group, showing reactivity comparable to that of flaviniumsalts which are the prominent organocatalysts for oxygenations. Because of their high stability
制备了一系列的单取代的嘧啶鎓和吡嗪鎓三氟甲磺酸酯和3,5-二取代的吡啶鎓三氟甲磺酸酯,并使用硫氧化作为模型反应,对过氧化氢的简单氧化催化剂进行了测试。它们的催化效率在很大程度上取决于取代基的类型,并且对于具有吸电子基团的衍生物而言是显着的,其反应性与黄酮盐相当,后者是氧合作用的主要有机催化剂。由于它们的高稳定性和良好的可及性,4-(三氟甲基)嘧啶鎓和3,5-二硝基吡啶鎓三氟甲磺酸盐是选择的催化剂,并显示出催化脂肪族和芳香族硫化物氧化为亚砜的作用,定量转化率高,制备产率高,并且具有优异的性能。化学选择性。K R +值(p K R + <5)和较小的负还原电位(E red > -0.5 V)。在催化氧化过程中原位形成的过氧化氢加合物充当底物氧化剂。通过在B3LYP / 6-311 ++ g(d,p)水平上的计算获得的从这些杂环氢过氧化物到硫代苯甲醚的转移的吉布斯自由能表明,它们是比烷基氢过氧化
C−H Cyanation of 6-Ring N-Containing Heteroaromatics
作者:Bryony L. Elbert、Alistair J. M. Farley、Timothy W. Gorman、Tarn C. Johnson、Christophe Genicot、Bénédicte Lallemand、Patrick Pasau、Jakub Flasz、José L. Castro、Malcolm MacCoss、Robert S. Paton、Christopher J. Schofield、Martin D. Smith、Michael C. Willis、Darren J. Dixon
DOI:10.1002/chem.201703931
日期:2017.10.20
them have the potential for far‐reaching impact across synthetic chemistry and the biomedical sciences. Herein, we report an approach to heteroaromatic C−H cyanation through triflic anhydrideactivation, nucleophilicaddition of cyanide, followed by elimination of trifluoromethanesulfinate to regenerate the cyanated heteroaromatic ring. This one‐pot protocol is simple to perform, is applicable to a broad
Efficient copper-catalyzedtrifluoromethylation of aromatic iodides was achieved with TMSCF3 in the presence of trimethylborate. The Lewis acid was used to anchor the in situ generated trifluoromethyl anion and suppress its rapid decomposition. Broad applicability of the new trifluoromethylating reaction was demonstrated in the functionalization of different aromatic and heteroaromatic iodides.