Redox-Neutral [4 + 2] Annulation of <i>N</i>-Methoxybenzamides with Alkynes Enabled by an Osmium(II)/HOAc Catalytic System
作者:Jian Yang、Liexin Wu、Huiying Xu、Hui Gao、Zhi Zhou、Wei Yi
DOI:10.1021/acs.orglett.9b03827
日期:2019.12.20
C-H activation strategy, an efficient osmium(II)-catalyzed redox-neutral [4 + 2] annulation of N-methoxybenzamides with alkynes has been accomplished. Computational and experimental studies revealed that such transformation leading to the synthesis of the isoquinolone core might follow an Os(II)-Os(IV)-Os(II) catalytic pathway, in which an unusual HOAc-assisted oxidative addition of osmium(II) into
Regioselective synthesis of multisubstituted isoquinolones and pyridones via Rh(<scp>iii</scp>)-catalyzed annulation reactions
作者:Liangliang Shi、Ke Yu、Baiquan Wang
DOI:10.1039/c5cc05977a
日期:——
A mild and efficient Rh(III)-catalyzedregioselective synthesis of isoquinolones and pyridones has been developed. The protocol uses readily available N-methoxybenzamide or N-methoxymethacrylamide and diazo compounds as the starting materials. The...
Rh(<scp>iii</scp>)-catalyzed diastereoselective cascade annulation of enone-tethered cyclohexadienones <i>via</i> C(sp<sup>2</sup>)–H bond activation
作者:Sandip B. Jadhav、Sundaram Maurya、N. Navaneetha、Rambabu Chegondi
DOI:10.1039/d1cc05941f
日期:——
highly diastereoselective arylative cyclization of enone-tethered cyclohexadienones via Rh(III)-catalyzed C–H activation of N-methoxybenzamides. This reaction proceeds through the formation of a five-membered rhodacycle followed by bis-Michael cascade annulation to access functionalized bicyclic scaffolds with four contiguous stereocenters with a broad substrate scope. These products have excellent functional
在此,我们报告了通过Rh( III ) 催化的N-甲氧基苯甲酰胺的C-H 活化对烯酮系环己二烯酮进行高度非对映选择性芳基化环化。该反应通过形成五元罗丹环进行,然后是双迈克尔级联环化,以访问具有广泛底物范围的具有四个连续立体中心的功能化双环支架。这些产品具有出色的功能手柄,允许进一步合成转化以增加结构复杂性。此外,还介绍了芳基化环化的机理研究和克级实验。
Regiocontrolled Coupling of Aromatic and Vinylic Amides with α-Allenols To Form γ-Lactams via Rhodium(III)-Catalyzed C–H Activation
作者:Zhi Zhou、Guixia Liu、Xiyan Lu
DOI:10.1021/acs.orglett.6b02903
日期:2016.11.4
rhodium(III)-catalyzed C–H activation has been demonstrated. This [4 + 1] annulationreaction provides an efficient method for the synthesis of isoindolinones and 1,5-dihydro-pyrrol-2-ones bearing a tetrasubstituted carbon atom α to the nitrogen atom with good functional group tolerance. The hydroxyl group in the allene substrate is essential in controlling the chemo- and regioselectivity of the reaction probably by
C–F Bond Cleavage Enabled Redox-Neutral [4+1] Annulation via C–H Bond Activation
作者:Cheng-Qiang Wang、Lu Ye、Chao Feng、Teck-Peng Loh
DOI:10.1021/jacs.6b12142
日期:2017.2.8
α-difluoromethylene alkyne as a nontraditional one-carbon reaction partner, a synthetically novel method for the construction of isoindolin-1-one derivatives viaRh(III)-catalyzed [4+1] annulation reaction is reported. The 2-fold C-F bondcleavage not only enables the generation of desired product under an overall oxidant-free condition but also results in a net migration of carbon-carbontriplebond. In addition