Rh(I)‐Catalyzed Direct C6−H Arylation of 2‐Pyridones with Aryl Carboxylic Acids
作者:Haoqiang Zhao、Jianbin Xu、Xin Xu、Yixiao Pan、Zexin Yu、Lijin Xu、Qinghua Fan、Patrick J. Walsh
DOI:10.1002/adsc.202100596
日期:2021.8.13
Rh(I)-catalyzed C6-selective C−H arylation of 2-pyridones with inexpensive, readily available, safe and structurally diverse aryl carboxylic acids with the aid of a pyridine directing group is developed. This decarbonylative arylation protocol features an easy-to-handle catalytic system, and is amenable to diversely substituted 2-pyridones and aryl carboxylic acids. It allows access to a wide range
A Rh-catalyzed chelation-assisted C6-selective C–Hactivation/alkylation of 2-pyridones with readily available alkyl carboxylic acids or anhydrides is introduced. The reaction proceeds via substrate decarbonylation. This approach merges C–H functionalization with readily available anhydrides, allowing for the efficient synthesis of various C6-alkylated 2-pyridones with good functional group tolerance
Manganese(I)‐Catalyzed Site‐Selective C6‐Alkenylation of 2‐Pyridones Using Alkynes via C−H Activation
作者:Shanhong Wan、Zhenli Luo、Xin Xu、Haiyang Yu、Jiajie Li、Yixiao Pan、Xin Zhang、Lijin Xu、Rui Cao
DOI:10.1002/adsc.202100056
日期:2021.5.18
A Mn(I)-catalyzed chelation-assisted direct C6−H alkenylation of 2-pyridones with both terminal and internal alkynes in a highlyregio- and stereo-selective manner has been developed. The catalytic system consisting of Mn(CO)5Br catalyst and KOAc additive allows 1-(2-pyridyl)-2-pyridones to undergo alkenylation with various terminalalkynes in methyl tert-butyl ether (MTBE) to furnish the C6-alkenylated
Rhodium(III)‐Catalyzed C−H Bond Functionalization of 2‐Pyridones with Alkynes: Switchable Alkenylation, Alkenylation/Directing Group Migration and Rollover Annulation
Cp*Rh(III)-catalyzed chelation-assisted direct C−H bond functionalization of 1-(2-pyridyl)-2-pyridones with internal alkynes that can be controlled to give three different products in good yields has been realized. Depending on the reaction conditions, solvents and additives, the reaction pathway can be switched between alkenylation, alkenylation/directing group migration and rollover annulation. These
1-(2-吡啶基)-2-吡啶酮与内部炔烃的 Cp*Rh(III) 催化螯合辅助直接 C-H 键官能化已经实现,这些炔烃可以被控制以产生三种不同的产品,收率良好。根据反应条件、溶剂和添加剂,反应途径可以在烯基化、烯基化/导向基团迁移和翻转环化之间切换。这些反应歧管允许不同地访问各种有价值的 C6-烯基化 1-(2-吡啶基)-2-吡啶酮,( Z )-6-(1,2-二芳基-2-(吡啶-2-基)乙烯基) pyridin-2(1 H )-ones 和 10 H- pyrido[1,2- a][1,8]naphthyridin-10-ones 来自相同的起始材料。这些协议表现出出色的区域和立体选择性、广泛的底物范围和良好的官能团耐受性。已采用实验和计算方法的组合来揭示这些反应的关键机制特征。
Domino C–H Activation/Directing Group Migration/Alkyne Annulation: Unique Selectivity by d<sup>6</sup>-Cobalt(III) Catalysts
作者:Cuiju Zhu、Rositha Kuniyil、Becky B. Jei、Lutz Ackermann
DOI:10.1021/acscatal.9b05413
日期:2020.4.3
control in Cp*CoIII-catalyzed domino C–Hactivation/pyridine directing group migration/alkyne annulation has been accomplished through the nucleophilicity of an organometallic cobalt intermediate with a d6 electron configuration. Detailed mechanistic studies provided compelling evidence for a facile C–Hactivation along with a favorable migration of the directing group for the Cp*CoIII catalysis, rather
通过具有ad 6电子构型的有机金属钴中间体的亲核性,完成了Cp * Co III催化的多米诺骨牌CH-H活化/吡啶引导基团迁移/炔烃环化反应中的不同选择性控制。详细的机理研究提供了令人信服的证据,证明了C–H的活化很容易,并且Cp * Co III催化的导向基团有良好的迁移,而不是(CO)3 Mn I歧管观察到的β-氧消除。