Development of a Traceless Directing Group: Cp*-Free Cobalt-Catalyzed C–H Activation/Annulations to Access Isoquinolinones
作者:Minghui Liu、Jun-Long Niu、Dandan Yang、Mao-Ping Song
DOI:10.1021/acs.joc.9b03073
日期:2020.3.20
A new tracelessdirectinggroup, 2-(hydroxymethyl)pyridine, has been reported for the Cp*-free cobalt-catalyzedC-H activation/annulation reaction to synthesize isoquinolinones. The reaction exhibits good functional group tolerance, affording products in good to excellent isolated yields under mild conditions. Notably, the directinggroup can be removed directly in situ along the catalytic process
Dehydrative C–H/N–OH Functionalizations in H<sub>2</sub>O by Ruthenium(II) Catalysis: Subtle Effect of Carboxylate Ligands and Mechanistic Insight
作者:Fanzhi Yang、Lutz Ackermann
DOI:10.1021/jo501884v
日期:2014.12.19
A ruthenium(II) complex derived from the electron-deficient aromatic carboxylic acid 3-(F3C)C6H4CO2H proved to be a highly efficient catalyst for dehydrative alkyne annulation by NH-free hydroxamic acids in water. The C–H/N–OH functionalization occurred with excellent positional selectivity as well as ample substrate scope, setting the stage for effective intermolecular alkenylations of hydroxamic
衍生自缺电子芳族羧酸3-(F 3 C)C 6 H 4 CO 2 H的钌(II)络合物被证明是通过水中不含NH的异羟肟酸使炔烃脱水的高效催化剂。C–H / N–OH官能化具有出色的位置选择性以及充足的底物范围,为异羟肟酸的有效分子间烯基化奠定了基础。详细的力学研究表明,通过羧酸盐的协助以及随后的迁移性炔烃插入,还原消除和分子内氧化加成,可在动力学上实现C–H的金属化。
Cobalt-catalyzed C-H annulation of N-aroylpicolinamides with alkynes for (NH)-isoquinolones synthesis
A cobalt-catalyzed C-H annulation of N-aroylpicolinamides with alkynes has been developed for the construction of (NH)-isoquinolone scaffolds. The reaction employs picolinamide as a tracelessdirectinggroup and provides a facile and straightforward approach to access various (NH)-isoquinolone derivatives in good yields.