We report a set of electrochemically regulated protocols for the divergent synthesis of ketones and β-keto esters from the same β-hydroxycarboxylic acid starting materials. Enabled by electrochemical control, the anodic oxidation of carboxylic acids proceeded in either a one-electron or a two-electron pathway, leading to a 1,4-aryl transfer or a semipinacol-type 1,2-group transfer product with excellent
Amide-Directed C−H Sodiation by a Sodium Hydride/Iodide Composite
作者:Yinhua Huang、Guo Hao Chan、Shunsuke Chiba
DOI:10.1002/anie.201702512
日期:2017.6.1
A new protocol for amide-directed ortho and lateral C-H sodiation is enabled by sodiumhydride (NaH) in the presence of either sodium iodide (NaI) or lithium iodide (LiI). The transient organosodium intermediates could be transformed into functionalized aromatic compounds.
Formation of biphenylene by elimination of C2 from 9,10-didehydrophenanthrene at 1100°C
作者:Roger F.C Brown、Karen J Coulston、Frank W Eastwood
DOI:10.1016/s0040-4039(96)01488-8
日期:1996.9
Flash vacuum pyrolysis of phenanthrene-9,10-dicarboxylic anhydride 5 and of 2,2-dimethyl-5-(9′-fluorenylidene)-1,3-dioxan-4,6-dione 8 at 1100°C/0.03–0.04 mm Hg gave pyrolysates which were analysed by 1H NMR spectroscopy and shown to contain phenanthrene 9 as a major constituent and biphenylene 2 as a minor one.
在1100°C / 0.03-0.04下快速真空热解菲-9,10-二羧酸酐5和2,2-二甲基-5-(9'-芴基)-1,3-二恶烷-4,6-二酮8毫米汞柱得到热解产物,其通过1 H NMR光谱分析,并显示包含菲9作为主要成分,联苯2作为次要成分。
Disubstituted “K-region” arene oxides
作者:D. Avnir、A. Grauer、D. Dinur、J. Blum
DOI:10.1016/0040-4020(75)80255-9
日期:1975.1
The first syntheses of tri- and tetra-cyclic vic-disubstituted areneoxides are described. The general route to 9,10-dimethyl- and 9,10 - bis(p - chlorophenyl) - phenanthrene - 9,10 - oxide, and to 5,6 - diphenylbenzo[c]phenanthrene 5,6 - oxide, includes oxidation of the unsubstituted aromatic hydrocarbon to the K-region quinone followed by reaction with an alkyl- or aryl-magnesium bromide and treatment
描述了三环和四环维克二取代的芳烃氧化物的第一合成。生成9,10-二甲基-和9,10-双(对氯苯基)-菲-9,10-氧化物和生成5,6-二苯基苯并[ c ]菲5,6-氧化物的一般方法包括氧化将未取代的芳烃加到K-区醌上,然后与烷基或芳基-溴化镁反应,并用二甲基甲酰胺二甲基缩醛处理所得的反式-二醇。先前关于二取代氧化丙烯的合成的报告已被证明是错误的。
Palladium(II)-Catalyzed C(sp<sup>2</sup>)–H Bond Activation/C–N Bond Cleavage Annulation of <i>N</i>-Methoxy Amides and Arynes
The Pd(II)-catalyzedC–Hbond activation/C–Nbond cleavage annulation reaction of N-alkyoxyamide aryne is developed to synthesize 9,10-dihydrophenanthrenone derivatives. This reaction exhibited good functional group compatibility with yields up to 92%. Detailed mechanistic studies showed that the key to C–Nbond cleavage is the formed eight-membered palladacycle intermediate undergoing nucleophilic