Silver(I)-Mediated CH Amination of 2-Alkenylanilines: Unique Solvent-Dependent Migratory Aptitude
作者:So Won Youn、Tae Yun Ko、Min Jung Jang、Su San Jang
DOI:10.1002/adsc.201400759
日期:2015.1.12
A highly effective silver(I)‐mediated CHamination of 2‐alkenylanilines has been developed to afford a diverse range of substituted indoles. High functional group tolerance, broad substrate scope, simple/fast/high‐yielding reaction, and recovery/reuse of the inexpensive silver oxidant are noteworthy. Furthermore, an uncommon migratory process of β‐monosubstituted 2‐alkenylanilines with solvent‐dependence
Divergent Syntheses of Indoles and Quinolines Involving N1–C2–C3 Bond Formation through Two Distinct Pd Catalyses
作者:Su San Jang、Young Ho Kim、So Won Youn
DOI:10.1021/acs.orglett.0c02898
日期:2020.12.4
annulative couplings of 2-alkenylanilines with aldehydes using alcohols as both the solvent and hydrogen source have been developed. These domino processes allow divergent syntheses of two significant N-heterocycles, indoles and quinolines, from the same substrate by tuning reaction parameters, which seems to invoke two distinct mechanisms. The nature of the ligand and alcoholic solvent had a profound
ligand not only can facilitate the electrophilic aryl C–H rhodation but also can lower the olefin insertion barrier. Both electron-withdrawing and electron-donating directing groups such as -CONR2 and -NHAc could be employed in these reactions, which provides convenient routes toward a series styryl acetates, N-acetylindoles, and aryl methyl ketones.
尽管对过渡金属催化的Fujiwara–Moritani C–H型烯烃进行了广泛的研究,但这些转化中使用的烯烃仍主要限于活性丙烯酸酯和苯乙烯。富电子烯烃的选择性芳基CH烯化反应被认为是一个具有挑战性的问题。我们在本文中报道,简单且易于接近的缺电子的[CpRh(III)]和[Cp CF 3 Rh(III)](Cp CF 3 = C 5 Me 4 CF 3)配合物是富电子脱氢芳基化的有力催化剂烯烃,包括乙酸乙烯酯,酰胺和乙烯基醚。使用吸电子Cp或Cp CF 3配体代替特权Cp *(C5 Me 5)配体不仅可以促进亲电芳基C–H的铑基化,而且可以降低烯烃的插入势垒。在这些反应中都可以使用吸电子和供电子导向基团,例如-CONR 2和-NHAc,这提供了通向一系列乙酸苯乙烯酯,N-乙酰吲哚和芳基甲基酮的便捷途径。
Iridium-catalyzed carbonyl group-directed oxidative coupling of arenes with alkenes
作者:Kumaran Elumalai、Weng Kee Leong
DOI:10.1016/j.tetlet.2017.11.058
日期:2018.1
The iridium complex [Cp∗IrCl2]2 is a good catalyst for the directed oxidative coupling of arenes with alkenes; a wide range of carbonyl functionalities (NHCOR, CONH2 and COR) can be employed as the directing group.
Redox-Neutral Couplings between Amides and Alkynes via Cobalt(III)-Catalyzed C–H Activation
作者:Lingheng Kong、Songjie Yu、Xukai Zhou、Xingwei Li
DOI:10.1021/acs.orglett.5b03629
日期:2016.2.5
construction of heterocycles. This is ideally catalyzed by earth-abundant and eco-friendly transition metals. We report Co(III)-catalyzedredox-neutralcoupling between arenes and alkynes using an NH amide as an electrophilic directing group. The redox-neutral C–H activation/coupling afforded quinolines with water as the sole byproduct.