作者:Jaya Kishore Vandavasi、XiYe Hua、Hamdi Ben Halima、Stephen G. Newman
DOI:10.1002/anie.201710241
日期:2017.11.27
The use of transition‐metal catalysis to enable the coupling of readily available organic molecules has greatly enhanced the ability of chemists to access complex chemical structures. In this work, an intermolecular coupling reaction that unites organotriflates and aldehydes is presented. A unique catalyst system is identified to enable this reaction, featuring a Ni0 precatalyst, a tridentate Triphos
A novel Ni/photoredox-catalyzed acylation of aliphatic substrates, including simple alkanes and dialkyl ethers, has been developed. The method combines C–N bond activation of amides with a radical relay mechanism involving hydrogen-atom transfer. The protocol is operationally simple, employs bench-stable N-acyl imides as acyl-transfer reagents, and permits facile access to alkyl ketones under very
Practical one-pot preparation of ketones from aryl and alkyl bromides with aldehydes and DIH via Grignard reagents
作者:Souya Dohi、Katsuhiko Moriyama、Hideo Togo
DOI:10.1016/j.tet.2012.05.059
日期:2012.8
groups, such as ester, nitrile, ketone, and nitro groups with i-PrMgCl·LiCl or PhMgCl instead of Mg, also provided the corresponding diaryl and alkyl arylketones in good yields. The above methods are simple and practical transition-metal-free methods for the preparation of various diaryl ketones and alkyl arylketones bearing electron-rich aromatic groups and electron-deficient aromatic groups, as well
通过衍生自芳基或烷基溴化物的格利雅试剂的反应,然后与芳族或脂族醛的反应以及随后用1,3-二碘的处理,可以有效地以高收率高效地制备各种二芳基酮,烷基芳基酮和二烷基酮。一锅法中的-5,5-二甲基乙内酰脲和K 2 CO 3。相同的处理的芳族溴化物轴承吸电子基团,如酯,腈,酮和硝基与我-PrMgCl·LiCl或PhMgCl代替Mg,也以良好的收率提供了相应的二芳基和烷基芳基酮。以上方法是用于制备各种带有富电子芳族基团和缺电子芳族基团的二芳基酮和烷基芳基酮以及二烷基酮的简单且实用的无过渡金属的方法。
Double Duty for Cyanogen Bromide in a Cascade Synthesis of Cyanoepoxides
作者:Zhou Li、Vladimir Gevorgyan
DOI:10.1002/anie.201006966
日期:2011.3.14
An unprecedented reaction mode of cyanogenbromide has been discovered. Under basic conditions, cyanogenbromide acts as an equivalent of both Br+ and CN− to convert enolizable ketones into the corresponding cyanoepoxides in good yields. This unique reaction mode provides new, one‐pot access to densely substituted cyanoepoxides from easily available ketones (see scheme).
One-Pot Arylative Epoxidation of Ketones by Employing Amphoteric Bromoperfluoroarenes
作者:Zhou Li、Vladimir Gevorgyan
DOI:10.1002/anie.201106969
日期:2012.1.27
A one‐pot cascade synthesis of perfluoroaryl oxiranes 2 by the arylativeepoxidation of enolizable ketones 1 with bromopentafluorobenzene (PFPBr) and derivatives (3) is reported. PFPBr is utilized as an equivalent of Br+ and PFP− in this highly efficient, easily scaled‐up, diastereoselective epoxidation reaction, which produces synthetically useful polyfluoroaryl oxiranes.