作者:Brian J. Groendyke、Deyaa I. AbuSalim、Silas P. Cook
DOI:10.1021/jacs.6b08171
日期:2016.10.5
This communication describes a mild, amide-directed fluorination of benzylic, allylic, and unactivated C-H bonds mediated by iron. Upon exposure to a catalytic amount of iron(II) triflate (Fe(OTf)2), N-fluoro-2-methylbenzamides undergo chemoselective fluorine transfer to provide the corresponding fluorides in high yield. The reaction demonstrates broad substrate scope and functional group tolerance
该通讯描述了由铁介导的苄基、烯丙基和未活化的 CH 键的温和、酰胺导向氟化。在接触催化量的三氟甲磺酸铁 (II) (Fe(OTf)2) 后,N-氟-2-甲基苯甲酰胺进行化学选择性氟转移,以高产率提供相应的氟化物。该反应显示出广泛的底物范围和官能团耐受性,无需使用任何贵金属添加剂。机理和计算实验表明,反应通过短寿命的自由基中间体进行,F-转移直接由铁介导。
Ortho-directed functionalization of arenes using magnesate bases
Ortho-directed functionalisation of arenes using lithium alkylmagnesate bases were achieved, demonstrating the potential use of arylmagnesates as suitable arylanions, without a further transmetallation step, for challenging functionalizations such as fluorination, hydroxylation, arylation, vinylation and alkylation through epoxide ring-opening.
Copper-Mediated/Catalyzed Oxyalkylation of Alkenes with Alkylnitriles
作者:Ala Bunescu、Qian Wang、Jieping Zhu
DOI:10.1002/chem.201405102
日期:2014.11.3
A copper‐promoted oxyalkylation of alkenes with alkylnitriles has been developed. The protocol provides rapid access to phthalides (γ‐lactones) or isochromanones (δ‐lactones) via the formation of a C(sp3)C(sp3) and a C(sp3)O bond with the generation of up to two quaternary carbon atoms. Mechanistic studies suggest that this reaction is initiated by the formation of the C(sp3)C(sp3) bond rather than
One-step pathway to selenoisobenzofuran-1(3<i>H</i>)-imine derivatives through highly selective selenocyclization of olefinic amides with benzeneselenyl chloride
作者:Xiwang Li、Pei He、Hai-Bing Zhou、Chune Dong
DOI:10.1039/c8ob00179k
日期:——
A 1,4-diazabicyclo[2.2.2]octane (DABCO) catalyzed selenocyclization of olefinic amides was achieved under mild reaction conditions. The reaction formed various benzeneselenyl substituted isobenzofuran-1(3H)-imine derivatives in good yields. The product was determined using single-crystal X-ray analysis. For compound 2u, the relative stereochemistry was established on the basis of NOESY NMR studies
Palladium-Catalyzed Oxidative Activation of Arylcyclopropanes
作者:Zhi He、Andrei K. Yudin
DOI:10.1021/ol062476e
日期:2006.12.1
Palladium chloride-catalyzed intramolecular activation of electroneutral cyclopropanederivatives results in cleavage of the cyclopropane ring followed by formation of heterocyclic derivatives. Phenols, carboxylic acids, and amide groups were considered as substituents ortho to the cyclopropane ring in this catalytic activation chemistry. The regioselectivity observed in the case of amide-containing