Direct Umpolung Morita–Baylis–Hillman like α‐Functionalization of Enones via Enolonium Species
作者:Shlomy Arava、Sourav K. Santra、Gulab K. Pathe、Raja Kapanaiah、Alex M. Szpilman
DOI:10.1002/anie.202005286
日期:2020.8.24
Morita–Baylis–Hillman type intermediates and application to the α‐functionalization of enone C−H bonds. This reaction gives direct access to α‐chloro‐enones, 1,2‐diketones and α‐tosyloxy‐enones. The latter are important intermediates for cross‐coupling reaction and, to the best of our knowledge, cannot be made in a single step from enones in any other way. The proposed mechanism is supported by spectroscopic
Manganese(III) Acetate-Mediated Cyclization of Diarylmethylenecyclopropa[<i>b</i>]naphthalenes: A Method for the Synthesis of 1,2-Benzanthracene Derivatives
sulfonic acid provides an efficient method for the synthesis of 1,2-benzanthracenes in moderate to good yields under mild conditions. In addition, after several steps of simple and routine operations, the obtained 1,2-benzanthracenes bearing an acetoxy group could be easily converted to structurally more sophisticated 1,2-benzanthracenederivatives, which are not easily accessible yet potentially useful
乙酸锰(III)介导的二芳基亚甲基环丙烷[ b ]萘与亲核试剂(如羧酸和磺酸)的自由基环化为在温和条件下以中等至良好收率合成1,2-苯并蒽提供了一种有效的方法。此外,经过几步简单且常规的操作后,获得的带有乙酰氧基的1,2-苯并蒽可以容易地转化为结构更复杂的1,2-苯并蒽衍生物,这些衍生物不易获得,但对材料科学而言可能是有用的候选物。 。
CN116462696
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Catalytic Reductive Cross Coupling and Enantioselective Protonation of Olefins to Construct Remote Stereocenters for Azaarenes
A novel enantioselective protonation protocol that is triggered by reductive cross coupling of olefins is reported. When under cooperative photoredox and chiral hydrogen-bonding catalytic conditions and using a terminal reductant, various α-branched vinylketones with diverse vinylazaarenes could provide important enantioenriched azaarene derivatives containing tertiary stereocenters at their remote
Formal Enone α-Arylation via I(III)-Mediated Aryl Migration/Elimination
作者:Bruna S. Martins、Daniel Kaiser、Adriano Bauer、Irmgard Tiefenbrunner、Nuno Maulide
DOI:10.1021/acs.orglett.1c00251
日期:2021.3.19
A formal enone α-arylation is described. This metal-free transformation relies on the I(III)-mediated skeletal reorganization of silyl enol ethers and features mild conditions, good yields, and high stereoselectivities for β-substituted enones.