Palladium-Catalyzed Synthesis of Indoles by Reductive N-Heteroannulation of 2-Nitrostyrenes
摘要:
A palladium-phosphine catalyzed reductive N-heteroannulation of 2-nitrostyrenes, in the presence of carbon monoxide, producing indoles has been developed. Indoles were obtained, in moderate to excellent yield, from substituted 2-nitrostyrenes having either electron-withdrawing (NO2 and CO2Me) or electron-donating (Br, OH, Me, OMe, and OTf) substituents on the aromatic ring. Best results were obtained using palladium diacetate (6 mol %) together with triphenylphosphine (24 mol %) as the catalytic system, under 4 atm of carbon monoxide in acetonitrile at 70 degrees C. Other palladium(II) and palladium(0) complexes also catalyze the reaction.
Nickel-Catalyzed Cyanation of Aryl Chlorides and Triflates Using Butyronitrile: Merging Retro-hydrocyanation with Cross-Coupling
作者:Peng Yu、Bill Morandi
DOI:10.1002/anie.201707517
日期:2017.12.4
We describe a nickel‐catalyzed cyanation reaction of aryl (pseudo)halides that employs butyronitrile as a cyanating reagent instead of highly toxic cyanide salts. A dual catalytic cycle merging retro‐hydrocyanation and cross‐coupling enables the conversion of a broad array of arylchlorides and aryl/vinyl triflates into their corresponding nitriles. This new reaction provides a strategically distinct
Dynamic Kinetic Cross-Electrophile Arylation of Benzyl Alcohols by Nickel Catalysis
作者:Peng Guo、Ke Wang、Wen-Jie Jin、Hao Xie、Liangliang Qi、Xue-Yuan Liu、Xing-Zhong Shu
DOI:10.1021/jacs.0c12462
日期:2021.1.13
Catalytic transformation of alcohols via metal-catalyzed cross-coupling reactions is very important, but it typically relies on a multistep procedure. We here report a dynamic kinetic cross-coupling approach for the direct functionalization of alcohols. The feasibility of this strategy is demonstrated by a nickel-catalyzed cross-electrophile arylation reaction of benzylalcohols with (hetero)aryl electrophiles
Simple and Efficient Generation of Aryl Radicals from Aryl Triflates: Synthesis of Aryl Boronates and Aryl Iodides at Room Temperature
作者:Wenbo Liu、Xiaobo Yang、Yang Gao、Chao-Jun Li
DOI:10.1021/jacs.7b03538
日期:2017.6.28
Despite the wide use of aryl radicals in organic synthesis, current methods to prepare them from aryl halides, carboxylic acids, boronic acids, and diazonium salts suffer from limitations. Aryl triflates, easily obtained from phenols, are promising aryl radical progenitors but remain elusive in this regard. Inspired by the single electron transfer process for aryl halides to access aryl radicals, we developed
The invention provides 2, 3-, 4- or 5-substituted-N1-(arylsulfonyl)indole and (heteroaryl)indole compounds of the general formula (I):
1
in which Ar, R
2
, R
3
, R
4
and R
5
are as defined in the specification. The compounds bind to the 5-HT
6
receptor and are useful for the treatment and prophylaxis of disorders mediated by the 5-HT
6
receptor, such as obesity and CNS disorders.
Cross‐Electrophile C(sp
<sup>2</sup>
)−Si Coupling of Vinyl Chlorosilanes
作者:Jicheng Duan、Ke Wang、Guang‐Li Xu、Shaolin Kang、Liangliang Qi、Xue‐Yuan Liu、Xing‐Zhong Shu
DOI:10.1002/anie.202010737
日期:2020.12.14
C−Si bond remains unexplored. Here we report a cross‐electrophile Csp2‐Si coupling reaction of vinyl/aryl electrophiles with vinyl chlorosilanes. This new protocol offers an approach for facile and precise synthesis of organosilanes with high molecular diversity and complexity from readily available materials. The reaction proceeds under mild and non‐basic conditions, demonstrating a high step economy