Catalytic Decarboxylative Alkenylation of Enolates
摘要:
A palladium-catalyzed decarboxylative alkenylation of stabilized enolates has been developed, which gives rise to alkenylated dicarbonyl products from enol carbonates regioselectively with concomitant installation of a quaternary all-carbon center. The broad scope of the reaction has been demonstrated by successfully utilizing a range of enolates and external phenol nucleophiles.
Catalytic Decarboxylative Alkenylation of Enolates
摘要:
A palladium-catalyzed decarboxylative alkenylation of stabilized enolates has been developed, which gives rise to alkenylated dicarbonyl products from enol carbonates regioselectively with concomitant installation of a quaternary all-carbon center. The broad scope of the reaction has been demonstrated by successfully utilizing a range of enolates and external phenol nucleophiles.
Catalytic Chemo- and Regioselective Coupling of 1,3-Dicarbonyls with <i>N</i>-Heterocyclic Nucleophiles
作者:Miles Kenny、Daniel J. Kitson、Vilius Franckevičius
DOI:10.1021/acs.joc.6b00731
日期:2016.6.17
compounds with indole, pyrrole, imidazole, and pyrazole nucleophiles via an allylic linker under neutral conditions is disclosed. This process enables the installation of an all-carbon quaternary center and new C–C and C–N bonds in a single operation. Despite the weakly acidic nature of N-heterocycles, the reactions proceed with good efficiency and complete regio- and chemoselectivity.
Palladium-Catalysed Construction of All-Carbon Quaternary Centres with Propargylic Electrophiles: Challenges in the Simultaneous Control of Regio-, Chemo- and Enantioselectivity
allylic alkylation are disclosed. This article describes the palladium-catalysed three-component coupling of 1,3-dicarbonyl compounds with nucleophiles and propargylic electrophiles for the generation of quaternary all-carbon centres in a single step, which necessitates the simultaneous control of regio-, chemo- and enantioselectivity. The use of propargyl enol carbonates, the source of two of the components
摘要 本文介绍了钯催化的1,3-二羰基化合物与亲核试剂和炔丙基亲电试剂的三组分偶联,可在一个步骤中生成季全碳中心,这需要同时控制区域,化学和对映选择性。发现使用炔丙基碳酸酯(两种成分的来源)对于维持高水平的区域控制和化学选择性至关重要,而仔细分析p K aO-,C-和N-亲核试剂作为其他偶联伴侣的趋势表明,使用相对酸性的物质(例如苯酚,1,3-二羰基化合物和芳族N-杂环)可能会获得最高的选择性。最后,公开了对通过烯基化和烯丙基烷基化发展季全碳中心的催化对映选择性结构的研究。 本文介绍了钯催化的1,3-二羰基化合物与亲核试剂和炔丙基亲电试剂的三组分偶联,可在一个步骤中生成季全碳中心,这需要同时控制区域,化学和对映选择性。发现使用炔丙基碳酸酯(两种成分的来源)对于维持高水平的区域控制和化学选择性至关重要,而仔细分析p K aO-,C-和N-亲核试剂作为其他偶联伴侣的趋势表明,使用相对酸性的物质(例如苯酚,1
Regioswitchable Palladium-Catalyzed Decarboxylative Coupling of 1,3-Dicarbonyl Compounds
作者:Miles Kenny、Jeppe Christensen、Simon J. Coles、Vilius Franckevičius
DOI:10.1021/acs.orglett.5b01979
日期:2015.8.7
A palladium-catalyzed chemo- and regioselective coupling of 1,3-dicarbonyl compounds via an allylic linker has been developed. This reaction, which displays broad substrate scope, forms two C-C bonds and installs two all-carbon quaternary centers. The regioselectivity of the reaction can be predictably controlled by utilizing an enol carbonate of one of the coupling partners.
Catalytic Decarboxylative Alkenylation of Enolates
作者:Sybrin P. Schröder、Nicholas J. Taylor、Paula Jackson、Vilius Franckevičius
DOI:10.1021/ol401729m
日期:2013.7.19
A palladium-catalyzed decarboxylative alkenylation of stabilized enolates has been developed, which gives rise to alkenylated dicarbonyl products from enol carbonates regioselectively with concomitant installation of a quaternary all-carbon center. The broad scope of the reaction has been demonstrated by successfully utilizing a range of enolates and external phenol nucleophiles.