2-烯基苯酚和烯酰胺的催化对映选择性卤环化已经通过使用手性酰胺磷酸盐催化剂和卤代路易斯酸实现。密度泛函理论计算表明催化剂的路易斯碱度在反应性和对映选择性中起重要作用。所得手性卤代色满可以在短时间内转化为 α-生育酚、α-生育三烯酚、代达林 A 和英格列酮。此外,具有不饱和侧链的卤化产物可在自由基环化条件下提供多环加合物。
Pd-Catalyzed Alkene Difunctionalization Reactions of Enolates for the Synthesis of Substituted Bicyclic Cyclopentanes
作者:Evan C. Bornowski、Elsa M. Hinds、Derick R. White、Yusuke Nakamura、John P. Wolfe
DOI:10.1021/acs.oprd.9b00248
日期:2019.8.16
Palladium-catalyzed alkene difunctionalization reactions between alkenes bearing tethered aryl or alkenyl triflates and enolate nucleophiles are described. The transformations form two C–C bonds, a ring, and up to two stereocenters while producing substituted cyclopentane derivatives that contain appended carbonyl functionality. Products are formed with up to >20:1 diastereoselectivity, and the formation
Pd-Catalyzed Alkene Difunctionalization Reactions of Malonate Nucleophiles: Synthesis of Substituted Cyclopentanes via Alkene Aryl-Alkylation and Akenyl-Alkylation
作者:Derick R. White、Elsa M. Hinds、Evan C. Bornowski、John P. Wolfe
DOI:10.1021/acs.orglett.9b01258
日期:2019.5.17
The Pd-catalyzed coupling of malonate nucleophiles with alkenes bearing tethered aryl or alkenyl triflates is described. These alkene difunctionalization reactions afford malonate-substituted cyclopentanes that contain fused aryl or cycloalkenyl rings. The transformations generate a five-membered ring, two C-C bonds, and provide products bearing up to three stereocenters with good chemical yield and
N-Selenocyanato-Dibenzenesulfonimide: A New Electrophilic Selenocyanation Reagent
作者:Zhi-Min Chen、Deng Zhu、Ai-Hui Ye
DOI:10.1055/a-1493-6885
日期:2021.10
A new electrophilic selenocyanation reagent N-selenocyanato-dibenzenesulfonimide was readily prepared in two steps from commercially available dibenzenesulfonimide for the first time. A variety of electrophilic selenocyanato reactions of nucleophiles have been achieved using it as selenocyanato source under mild and simple conditions. Numerous SeCN-containing compounds were obtained in moderate to
Lewis-Acid-Mediated Intramolecular Trifluoromethylthiolation of Alkenes with Phenols: Access to SCF<sub>3</sub>-Containing Chromane and Dihydrobenzofuran Compounds
A Lewis-acid-mediated intramolecular trifluoromethylthiolation of alkenes with phenols that can offer direct access to SCF3-containing chromane and dihydrobenzofuran compounds was disclosed for the first time. Numerous SCF3-containing chromanes were obtained in moderate to good yields using γ-substituted 2-allyphenols as substrates. Meanwhile, various SCF3-containing dihydrobenzofurans with oxa-quaternary
Gold(I)-Catalyzed Intermolecular Aryloxyvinylation with Acetylene Gas
作者:Tania Medina-Gil、Anna Sadurní、L. Anders Hammarback、Antonio M. Echavarren
DOI:10.1021/acscatal.3c02461
日期:2023.8.18
chemical production, although it is underutilized in organic synthesis. We have developed an intermoleculargold(I)-catalyzed alkyne/alkene reaction of o-allylphenols with acetylene gas that gives rise to chromanes by a stereospecific aryloxycyclization through the nucleophilic regioselective opening of cyclopropyl gold(I)-carbene intermediates. The synthetic application of this method was demonstrated in