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
Intramolecular N–Me and N–H aminoetherification for the synthesis of <i>N</i>-unprotected 3-amino-O-heterocycles
作者:Mahesh P. Paudyal、Mingliang Wang、Juha H. Siitonen、Yimin Hu、Muhammed Yousufuddin、Hong C. Shen、John R. Falck、László Kürti
DOI:10.1039/d0ob02122a
日期:——
A mild Rh-catalyzed method for synthesis of cyclic unprotected N–Me and N–H 2,3-aminoethers using an olefin aziridination–aziridine ring-opening domino reaction has been developed. The method is readily applicable to the stereocontrolled synthesis of a variety of 2,3-disubstituted aminoether O-heterocyclic scaffolds, including tetrahydrofurans, tetrahydropyrans and chromanes.
The SO3H-tethered imidazolium and triazolium salts, nonvolatile and recyclable Brønstedacidicionicliquids, efficiently mediate intramolecular hydroalkoxylations of alkenyl alcohols. They have been successfully employed in the synthesis of (±)-centrolobine.
SO 3 H系咪唑鎓盐和三唑鎓盐,不挥发且可回收的布朗斯台德酸性离子液体,可有效介导链烯醇的分子内加氢烷氧基化反应。它们已成功地用于合成(±)-中心洛宾。
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
3-diarylpropenes were synthesized in good to high yields by the palladium-catalyzedallylicarylation of allylicethers, such as a cinnamyl phenyl ether, with a variety of arylboronicacidsusing a hydrazone 1a–Pd(OAc)2 system in DMAc/H2O. Using this catalyst, eugenol was also synthesized from allyl phenyl ether with (4-hydroxy-3-methoxyphenyl)boronic acid pinacol ester.