Polycyclization Enabled by Relay Catalysis: One-Pot Manganese-Catalyzed C−H Allylation and Silver-Catalyzed Povarov Reaction
作者:Shi-Yong Chen、Qingjiang Li、Xu-Ge Liu、Jia-Qiang Wu、Shang-Shi Zhang、Honggen Wang
DOI:10.1002/cssc.201700452
日期:2017.6.9
is described for the one‐pot synthesis of polycyclic products by a formal [3+2] and [4+2] cycloadditionreaction cascade. A manganese(I) complex catalyzed the first example of directed C−H allylation with allenes, setting the stage for an in situ Povarov cyclization catalyzed by silver(I). The reaction proceeds with high bond‐forming efficiency (three C−C bonds), broad substrate scope, high regio‐ and
在这项研究中,描述了一种基于Mn I / Ag I的中继催化过程,用于通过正式的[3 + 2]和[4 + 2]环加成反应级联来单锅合成多环产物。锰(I)配合物催化了与丙二烯直接进行CH烯丙基化的第一个例子,为银(I)催化原位Povarov环化奠定了基础。该反应以高键形成效率(三个C键),广泛的底物范围,高的区域和立体选择性以及100%的原子经济性进行。
Regioselective Synthesis of <i>tert</i>-Allylic Ethers via Gold(I)-Catalyzed Intermolecular Hydroalkoxylation of Allenes
作者:Maximillian S. Hadfield、Ai-Lan Lee
DOI:10.1021/ol902675k
日期:2010.2.5
A highly regioselective method towards tertiary allylic ethers via gold(I)-catalyzed intermolecular hydroalkoxylation of allenes is disclosed. Preventing subsequent isomerization of the tertiary allylic ether products to primary allylic ethers appears to be the key to achieving high regioselectivities.
Rhodium-Catalyzed Chemo- and Regioselective Decarboxylative Addition of β-Ketoacids to Allenes: Efficient Construction of Tertiary and Quaternary Carbon Centers
作者:Changkun Li、Bernhard Breit
DOI:10.1021/ja411397g
日期:2014.1.22
A rhodium-catalyzedchemo- and regioselective intermolecular decarboxylative addition of β-ketoacids to terminalallenes is reported. Using a Rh(I)/DPPF system, tertiary and quaternary carbon centers were formed with exclusively branched selectivity under mild conditions. Preliminary mechanism studies support that the carbon-carbon bond formation precedes the decarboxylation and the reaction occurs
Unlocking the
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Selectivity of Benzotriazoles: Regiodivergent and Highly Selective Coupling of Benzotriazoles with Allenes
作者:Kun Xu、Niels Thieme、Bernhard Breit
DOI:10.1002/anie.201403682
日期:2014.7.7
The rhodium‐catalyzed, highly N2‐ and N1‐selective coupling of benzotriazoles with allenes is reported. The exceptionally high N2 and N1 selectivities were achieved by using a rhodium(I)/DPEphos and rhodium(I)/JoSPOphos catalyst, respectively. This method permits the atom‐economic synthesis of valuable branched N2‐ and N1‐allylated benzotriazole derivatives and allows for preliminary studies of their
CuH-Catalyzed Regio- and Enantioselective Hydrocarboxylation of Allenes: Toward Carboxylic Acids with Acyclic Quaternary Centers
作者:Sheng Feng、Stephen L. Buchwald
DOI:10.1021/jacs.1c01880
日期:2021.4.7
carboxylic acid derivatives, including those bearing all-carbon quaternary centers, through an enantioselective CuH-catalyzed hydrocarboxylation of allenes with a commercially available fluoroformate. A broad range of heterocycles and functional groups on the allenes were tolerated in this protocol, giving enantioenriched α-quaternary and tertiary carboxylic acid derivatives in good yields with exclusive branched