Triazole-Assisted Ruthenium-Catalyzed CH Arylation of Aromatic Amides
作者:Hamad H. Al Mamari、Emelyne Diers、Lutz Ackermann
DOI:10.1002/chem.201403019
日期:2014.7.28
heteroarenes, as well as alkenes, by using easy‐to‐handle aryl bromides as the arylating reagents. The triazole‐assisted CH activation strategy was found to be widely applicable, to occur under mildreaction conditions, and the catalytic system was tolerant of important electrophilic functionalities. Notably, the flexible triazole‐based auxiliary proved to be a more potent directing group for the optimized
Iron-Catalyzed C(sp<sup>2</sup>)H and C(sp<sup>3</sup>)H Arylation by Triazole Assistance
作者:Qing Gu、Hamad H. Al Mamari、Karolina Graczyk、Emelyne Diers、Lutz Ackermann
DOI:10.1002/anie.201311024
日期:2014.4.7
Modular 1,2,3‐triazoles enabled iron‐catalyzed CHarylations with broad scope. The novel triazole‐based bidentate auxiliary is easily accessible in a highly modular fashion and allowed for user‐friendly iron‐catalyzed C(sp2)H functionalizations of arenes and alkenes with excellent chemo‐ and diastereoselectivities. The versatile iron catalyst also proved applicable for challenging C(sp3)H functionalizations
cyclobutanes were accessed by a versatile palladium-catalyzed secondary C(sp3 )-H activation, exploiting chelation assistance by modular triazoles. The C-H arylation led to cyclobutane natural product derivatives in a highly regioselective fashion, setting the stage for the easy access to novel fluorogenic boron-dipyrrin (BODIPY)-labeled probes for live-cell imaging.
MnCl<sub>2</sub>
-Catalyzed C−H Alkylations with Alkyl Halides
作者:Weiping Liu、Gianpiero Cera、João C. A. Oliveira、Zhigao Shen、Lutz Ackermann
DOI:10.1002/chem.201703191
日期:2017.8.25
C−H alkylations with challenging β-hydrogen-containing alkylhalides were accomplished with sustainable MnCl2 as the catalyst under phosphine-ligand-free conditions. The proximity-induced benzamide C−H activation occurred with ample substrate scope through rate-determining C−H metalation, also setting the stage for manganese-catalyzed oxidative C−H methylations.