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