Rh(III)-Catalyzed Directed C−H Olefination Using an Oxidizing Directing Group: Mild, Efficient, and Versatile
摘要:
An efficient Rh(III)-catalyzed oxidative olefination by directed C-H bond activation of N-methoxybenzamides is reported. In this mild, practical, selective, and high-yielding process, the N-O bond acts as an internal oxidant. In addition, simply changing the substituent of the directing/oxidizing group results in the selective formation of valuable tetrahydroisoquinolinone products.
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。
Combining Rhodium and Photoredox Catalysis for CH Functionalizations of Arenes: Oxidative Heck Reactions with Visible Light
作者:David C. Fabry、Jochen Zoller、Sadiya Raja、Magnus Rueping
DOI:10.1002/anie.201400560
日期:2014.9.15
Direct, oxidative metal‐catalyzed CH functionalizations of arenes are important in synthetic organic chemistry. Often, (over‐)stoichoimetric amounts of organic or inorganic oxidants have to be used in these reactions. The combination of rhodium and photoredox catalysis with visible light allows the directCH olefination of arenes. Small amounts (1 mol %) of a photoredoxcatalyst resulted in the efficient
Ruthenium-Catalyzed Oxidative C–H Bond Olefination of <i>N</i>-Methoxybenzamides Using an Oxidizing Directing Group
作者:Bin Li、Jianfeng Ma、Nuancheng Wang、Huiliang Feng、Shansheng Xu、Baiquan Wang
DOI:10.1021/ol2032575
日期:2012.2.3
Ruthenium-catalyzed oxidative C-H bond olefination of N-methoxybenzamides using an oxidizing directing group with a broad substrate scope is reported. The reactions of N-methoxybenzamides with acrylates in MeOH and styrene (or norbornadiene) in CF3CH2OH afforded two types of products.