Ruthenium-catalyzed synthesis of <i>N</i>-substituted lactams by acceptorless dehydrogenative coupling of diols with primary amines
作者:Yanling Zheng、Xufeng Nie、Yang Long、Li Ji、Haiyan Fu、Xueli Zheng、Hua Chen、Ruixiang Li
DOI:10.1039/c9cc06339k
日期:——
Herein, we report the first example of synthesis of N-substituted lactams via an acceptorless dehydrogenative coupling of diols with primaryamines in one step, which was enabled by combining Ru3(CO)12 with a hybrid N-heterocyclic carbene–phosphine–phosphine ligand as the catalyst.
As a result of extensive studies on NAD(P)H oxidase inhibitors, the present inventors found that a quinolone derivative having, at the 2-position, an alkyl group substituted with a heteroatom or the like has an excellent NAD(P)H oxidase inhibitory activity, and accomplished the present invention. The compound of the present invention has a reactive oxygen species production inhibitory activity based on the NAD(P)H oxidase inhibitory activity, and therefore can be used as an agent for preventing and/or treating diabetes, impaired glucose tolerance, hyperlipidemia, fatty liver, diabetic complications and the like.
Weak-Chelation Assisted Cobalt-Catalyzed C–H Bond Activation: An Approach Toward Regioselective Ethynylation of <i>N</i>-Aryl γ-Lactam
作者:Shyam Kumar Banjare、Annapurna Saxena、Tanmayee Nanda、Namrata Prusty、Sofaya Joshi、Ponneri C. Ravikumar
DOI:10.1021/acs.orglett.2c04098
日期:2023.1.13
in a highly regioselective manner. In this protocol, earth-abundant cobalt(III)-catalyst was found to be effective, triggering the C–H metalation using a weakly coordinating lactam group. Herein, the ortho-(sp2)-H ethynylation has been obtained regioselectively. The mechanistic studies reveal the non-involvement of the radical pathway for this conversion. However, the parallelkinetic isotope experiment