Enantioselective Organocatalytic Multicomponent Synthesis of 2,6-Diazabicyclo[2.2.2]octanones
作者:Maria del Mar Sanchez Duque、Olivier Baslé、Yves Génisson、Jean-Christophe Plaquevent、Xavier Bugaut、Thierry Constantieux、Jean Rodriguez
DOI:10.1002/anie.201306656
日期:2013.12.23
compounds: The title reaction of β‐ketoamides, acrolein, and aminophenols, catalyzed by a bifunctional thiourea‐tertiary amine organocatalyst, enables the preparation of an enantioenriched diazabicyclo[2.2.2]octanone (2,6‐DABCO) scaffold. The chemoselective reaction sequence installs five new bonds and three stereocenters, two of which are contiguous tetrasubstituted centers, with excellent yields and high
Control of Activation Mode To Achieve Diastereodivergence in Asymmetric Syntheses of Chiral Spiropiperidinone Derivatives
作者:Xiang Li、Wei Huang、Yan-Qing Liu、Jing-Wen Kang、Dan Xia、Gu He、Cheng Peng、Bo Han
DOI:10.1021/acs.joc.6b02489
日期:2017.1.6
efficient organocatalytic cascadereaction has been developed involving a Michael–hemiaminalization relay for the asymmetric synthesis of spiropiperidinone derivatives bearing adjacent quaternary and tertiary chiral centers via LUMO or HOMO activation. Importantly, this methodology demonstrates that applying distinct activation modes to different substrates in the same reaction can diverge diastereoselectivity
The first organocatalytic general, efficient and highly enantioselective α‐hydroxyamination reactions of β‐ketoamides with nitrosobenzene are described using a thiourea/tertiary amine bifunctional catalyst. Significantly, the products were obtained in high enantiomeric purity using a low catalyst loading, and in the context of sustainable development, the full reaction mixture, including solvent, catalyst
A Cooperative Participation of the Amido Group in the Organocatalytic Construction of All-Carbon Quaternary Stereocenters by Michael Addition with β-Ketoamides
作者:Maria del Mar Sanchez Duque、Olivier Baslé、Nicolas Isambert、Anouk Gaudel-Siri、Yves Génisson、Jean-Christophe Plaquevent、Jean Rodriguez、Thierry Constantieux
DOI:10.1021/ol200924e
日期:2011.7.1
The secondary amido group of a-substituted beta-ketoamides plays a crucial role in the control of the reactivity and spatial arrangement (selectivity) in the organocatalyzed Michael addition to unsaturated carbonyls. This results in an unprecedented activation mode of substrates through H-bonding interactions allowing the construction of enantiomerically enriched functionalized all-carbon quaternary centers and spiroaminals of high synthetic potential.
Microwave-Assisted Wolff Rearrangement of Cyclic 2-Diazo-1,3-Diketones: An Eco-compatible Route to α-Carbonylated Cycloalkanones
作者:Marc Presset、Yoann Coquerel、Jean Rodriguez
DOI:10.1021/jo8021567
日期:2009.1.2
The microwave-assisted Wolff rearrangement of cyclic 2-diazo-1.3-diketones performed in the presence of a stoichiometric amount of alcohol, amine, or thiol is an efficient, user, and environmentally friendly synthetic protocol for the synthesis of alpha-carbonylated cycloalkanones. This approach proves superior to existing protocols in scope and eco-compatibility.