Interrupted Fischer-Indole Intermediates via Oxyarylation of Alkenyl Boronic Acids
作者:Heng-Yen Wang、Laura L. Anderson
DOI:10.1021/ol401416r
日期:2013.7.5
The oxyarylation of alkenylboronicacids with N-arylbenzhydroxamic acids has been achieved under both copper-mediated and copper-catalyzed conditions to provide access to interrupted Fischer-indole intermediates. This transformation is believed to proceed through a copper-promoted C–O bond forming event followed by a [3,3] rearrangement. The scope of the method is described and mechanistic experiments
A Simple, Modular Synthesis of Substituted Pyridines
作者:Songbai Liu、Lanny S. Liebeskind
DOI:10.1021/ja8013743
日期:2008.6.1
A simple, modular method to prepare highly substitutedpyridines is disclosed. The method employs a cascade reaction comprising (1) a novel N-iminative, Cu-catalyzed cross-coupling of alkenylboronic acids at the N-O bond of alpha,beta-unsaturated ketoxime O-pentafluorobenzoates, (2) electrocyclization of the resulting 3-azatriene, and (3) air oxidation affording highly substitutedpyridines in moderate
Copper-Mediated Difunctionalization of Alkenylboronic Acids: Synthesis of ɑ-Imino Ketones
作者:Ji-Wen Jiao、Hong-Yan Bi、Pei-Sen Zou、Zhi-Xin Wang、Cui Liang、Dong-Liang Mo
DOI:10.1002/adsc.201800718
日期:2018.9.3
Various ɑ‐imino ketones were prepared in good yields through a copper‐mediated difunctionalization of alkenylboronic acids with benzotriazolamine in air. Mechanistic studies showed that ɑ‐imino ketonesformation occurred through an initial copper‐mediated coupling reaction to form an enamine, followed by homolysis of the C−Cu bond to produce an ɑ‐radical imine, and finally radical oxidation by air. The
Preparation of α-Oxygenated Ketones by the Dioxygenation of Alkenyl Boronic Acids
作者:Aditi S. Patil、Dong-Liang Mo、Heng-Yen Wang、Daniel S. Mueller、Laura L. Anderson
DOI:10.1002/anie.201202704
日期:2012.7.27
Two in two: Dioxygenation of alkenylboronicacids has been achieved with N‐hydroxyphthalimide. The two‐step process involves etherification of an alkenylboronicacid with N‐hydroxyphthalimide followed by a [3,3] rearrangement. The dioxygenated product can then be hydrolyzed to form either the corresponding α‐hydroxy ketone or the α‐benzoyloxy ketone.
intramolecular Diels–Alder (IMDA) reaction efficiently accelerated by Schreiner's thiourea is reported, to build a functionalized cytochalasin scaffold (periconiasin series) for biological purposes. DFT calculation highlighted a unique multidentate cooperative hydrogen bonding in this catalysis. The deprotection end game afforded a collection of diverse structures and showed the peculiar reactivity of the