The palladium-mediated C-H radio-iodination of arenes using sodium iodide as the primary isotopic source is reported and performed without chemical know-how in 30 min and applied to the synthesis of complex radio-iodinated compounds of biological interest.
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。
<i>tert</i>-Butyl Nitrite-Mediated Synthesis of <i>N</i>-Nitrosoamides, Carboxylic Acids, Benzocoumarins, and Isocoumarins from Amides
作者:Subhash L. Yedage、Bhalchandra M. Bhanage
DOI:10.1021/acs.joc.7b00570
日期:2017.6.2
(TBN) as a multitask reagent for (1) the controlled synthesis of N-nitrosoamide from N-alkyl amides, (2) hydrolysis of N-methoxyamides to carboxylic acids, (3) metal- and oxidant-free benzocoumarin synthesisfrom ortho-aryl-N-methoxyamides via N–H, C–N, and C–H bond activation, and (4) isocoumarin synthesisusingRu(II)/PEG as a recyclable catalytic system via ortho-C–H activation and TBN as an oxygen source
A metal-free oxidative cycloaddition reaction of substituted benzamides and alkynes has been developed for the synthesis of isoquinolones by using bis(trifluoracetoxy)iodobenzene (PIFA) and trifluoroacetic acid (TFA). Under mild conditions, a wide variety of isoquinolones were conveniently prepared via oxidative annulation of simple N-methoxybenzamide and diarylacetylene or aryl/alkyl acetylene derivatives
Highly Selective Mild Stepwise Allylation of <i>N</i>-Methoxybenzamides with Allenes
作者:Rong Zeng、Chunling Fu、Shengming Ma
DOI:10.1021/ja303790s
日期:2012.6.13
allylation of N-methoxybenzamides 1 with polysubstituted allenes is reported. This C-H functionalization involving allenes is conducted under very mild conditions (-20 °C or room temperature) and compatible with ambient air and moisture, and it can be applied to terminal or internal allenes with different synthetically attractive functional groups. Highly efficient axial chirality transfer has been realized
报道了 N-甲氧基苯甲酰胺 1 与多取代丙二烯的有效 Rh(III) 催化逐步邻位烯丙基化。这种涉及丙二烯的 CH 官能化是在非常温和的条件下(-20 °C 或室温)进行的,并且与环境空气和水分兼容,它可以应用于具有不同合成吸引力官能团的末端或内部丙二烯。已经实现了高效的轴向手性转移,产生了光学活性内酯。
Rhodium(III)-Catalyzed Isoquinolone Synthesis: The N−O Bond as a Handle for C−N Bond Formation and Catalyst Turnover
to access the isoquinolone motif via cross-coupling/cyclization of benzhydroxamic acid with alkynes is described. The reaction features a regioselective cleavage of a C-H bond on the benzhydroxamic acid coupling partner as well as a regioselective alkyne insertion. Mechanistic studies point out the important involvement of a N-Obond as a tool for C-Nbondformation and catalystturnover.
描述了通过苯异羟肟酸与炔烃的交叉偶联/环化获得异喹诺酮基序的无外部氧化剂过程。该反应的特点是区域选择性裂解苯异羟肟酸偶联物上的 CH 键以及区域选择性炔烃插入。机理研究指出 NO 键作为 CN 键形成和催化剂周转的工具的重要参与。