Sequential C–H activation enabled expedient delivery of polyfunctional arenes
作者:Wensen Ouyang、Xiaoqing Cai、Xiaojian Chen、Jie Wang、Jianhang Rao、Yang Gao、Yanping Huo、Qian Chen、Xianwei Li
DOI:10.1039/d1cc03243g
日期:——
Modularconstruction of polyfunctional arenes from abundant feedstocks stands as an unremitting pursue in synthetic chemistry, accelerating the discovery of drugs and materials. Herein, using the multiple C–H activation strategy with versatile imidate esters, the expedient delivery of molecular libraries of densely functionalized sulfur-containing arenes was achieved, which enabled the concise construction
Efficient and selective hydrogenation of C–O bonds with a simple sodium formate catalyzed by nickel
作者:Xiaoxiang Xi、Tieqiao Chen、Ji-Shu Zhang、Li-Biao Han
DOI:10.1039/c7cc08709h
日期:——
A Ni-catalyzed hydrogenation of C–O compounds with sodium formate is developed. Various esters, i.e. aryl, alkenyl, benzyl pivalates, and even the arylethers, were efficiently reduced with a loading of nickel catalysts down to 0.5 mol%. Reactive functional groups such as C–C double bonds, carbonyl, CN, MeS and halogen groups are tolerable. This reaction can be used for the modification of complex
Copper-Mediated Functionalization of Aryl Trifluoroborates
作者:Melanie Sanford、Sydonie Schimler
DOI:10.1055/s-0035-1562529
日期:——
trifluoroborates with tetrabutylammonium or alkali metal salts to form C–O, C–N, and C–halogen bonds. The reactions proceed under mild conditions (often room temperature over 16 hours) with carboxylate, halide, and azide salts, all nucleophiles that have been underrepresented in the copper cross-coupling literature. Preliminary results show that coppersalts bearing weakly coordinating X-type ligands
本文描述了 Cu(OTf)2 介导的芳基和杂芳基三氟硼酸盐与四丁基铵或碱金属盐的偶联,形成 C-O、C-N 和 C-卤素键。反应在温和条件下进行(通常在室温下超过 16 小时),使用羧酸盐、卤化物和叠氮化物,所有亲核试剂在铜交叉偶联文献中都没有得到充分体现。初步结果表明,带有弱配位 X 型配体的铜盐对于使这些转化在温和条件下进行是必不可少的。
Nickel-Catalyzed Synthesis of Primary Aryl and Heteroaryl Amines via C–O Bond Cleavage
A nickel-catalyzed protocol for the conversion of aryl and heteroaryl alcohol derivatives to primary and secondary aromaticamines via C(sp2)–O bond cleavage is described. The new amination protocol can be applied to a range of substrates bearing diverse functional groups and uses readily available benzophenone imines as an effective nitrogen source.
Nickel-Catalyzed Phosphorylation of Phenol Derivatives via C–O/P–H Cross-Coupling
作者:Jia Yang、Jing Xiao、Tieqiao Chen、Li-Biao Han
DOI:10.1021/acs.joc.6b00289
日期:2016.5.6
An efficient nickel-catalyzed phosphorylation of phenol derivatives with P(O)–H compounds via C–O/P–H cross-coupling is described. Under the reaction conditions, various phenyl pivalates coupled readily with hydrogen phosphoryl compounds to afford the corresponding coupling products aryl phosphonates and aryl phosphine oxides in good to high yields.