Ir(III)-Catalyzed Mono-Olefination of Aryl C–H Bonds Using −SCF<sub>3</sub> as a Weak Directing Group
作者:Rui-Peng Bao、Xian Chen、Chen Li、Dong-Hui Wang
DOI:10.1021/acs.orglett.9b03125
日期:2019.10.4
The trifluoromethylthionyl group (-SCF3) is an efficient weak directing group for Ir(III)-catalyzed aryl C-H olefination. Various trifluoromethylthioethers provide high levels of mono-olefination products in good to excellent yields under mild conditions with a 2,2'-bipyridine ligand or AgBF4 as an additive. Mechanistic studies indicate the C-H cleavage is the rate-determining step. The directing group ability of the -SCF3 group is benchmarked against several other weak directing groups by competition experiments under Ir(III)-catalyzed conditions.
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.
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。
Ru(II)-Catalyzed Controlled Cross-Dehydrogenative Coupling of Benzamides with Activated Olefins via Weakly Coordinating Primary Amides
作者:Akanksha Singh Baghel、Anjali Aghi、Amit Kumar
DOI:10.1021/acs.joc.1c01090
日期:2021.7.16
Ru(II)-catalyzed regioselective ortho-alkenylation of primary benzamides with activated olefins has been realized over the competitive cyclized products. This reaction overall proceeds via a cross-dehydrogenative coupling (CDC) reaction using a simple and weakly coordinating primary amide group in the presence of an inexpensive Ru(II) salt and allows the controlled introduction of olefin motifs at