unexplored area for C−C bond formation. Herein 64 examples of β‐alkylated styrene derivatives, synthesized through the reactions of readily accessible feedstock olefins with β‐nitrostyrenes by ozone/FeII‐mediated radical substitutions, are reported. These reactions proceed with good efficiencies and high stereoselectivities under mild reaction conditions and tolerate an array of functional groups. Also demonstrated
烯烃C(sp 3)-C(sp 2)键的脱烯基烯基化作用一直是C-C键形成的未知区域。本文报道了64个β-烷基化苯乙烯衍生物的例子,这些例子是通过容易获得的原料烯烃与β-硝基苯乙烯通过臭氧/ Fe II介导的自由基取代反应而合成的。在温和的反应条件下,这些反应具有良好的效率和较高的立体选择性,并且可以耐受一系列官能团。还证明了该策略通过产品的几种合成转化以及天然产物异吗啡丁和药物(E)-美丹尼丁的合成的适用性。
Silver-Catalyzed Denitrative Sulfonylation of β-Nitrostyrenes: A Convenient Approach to (<i>E</i>)-Vinyl Sulfones
作者:Twinkle Keshari、Ritu Kapoorr、Lal Dhar S. Yadav
DOI:10.1002/ejoc.201600237
日期:2016.5
(readily available by the Henry reaction) for a highly stereoselective, convenient, and catalytic synthesis of (E)-vinyl sulfones at room temperature was investigated. The protocol involves efficient silver-catalyzed denitrative radical cross-coupling of β-nitrostyrenes and sodium sulfinates by using potassium persulfate as an additive to complete the catalytic cycle.
Organocatalytic Asymmetric Synthesis of 3,3-Disubstituted 3,4-Dihydro-2-quinolones
作者:Soumendranath Mukhopadhyay、Utpal Nath、Subhas Chandra Pan
DOI:10.1002/adsc.201700655
日期:2017.11.23
The first organocatalyticasymmetric reaction employing 3,4-dihydro-2-quinolone has been developed leading to the synthesis of biologically important 3,3-disubstituted-dihydro-2-quinolones. Cinchona alkaloid derived bifunctional amino-thiourea catalysts were found to be the best catalysts. The products were obtained in high enantio- and good diastereoselectivities and also few synthetic transformations
Chemo- and Stereoselective Cross Rauhut-Currier-Type Reaction of Tri-substituted Alkenes Containing Trifluoromethyl Groups
作者:Xiang-Hong He、Lei Yang、Yan-Ling Ji、Qian Zhao、Ming-Cheng Yang、Wei Huang、Cheng Peng、Bo Han
DOI:10.1002/chem.201705010
日期:2018.2.6
synthetically important, structurally complex 3‐allylic‐type oxindole skeletons. The asymmetric version of this RC‐type reaction can be realized by combining a Brønsted acid and Lewisbase for bifunctional H‐bonding‐tertiary amine catalysis. Subsequent transformation of multi‐functionalized RC‐type product leads to pharmacologically interesting cyclohexane‐based spiro‐pyrazolones bearing six contiguous chiral