Nickel-Catalyzed Suzuki–Miyaura Reaction of Aryl Fluorides
摘要:
Two protocols for the nickel-catalyzed cross-coupling of aryl fluorides with aryl boronic esters have been developed. The first employs metal fluoride cocatalysts, such as ZrF4 and TiF4, which enable Suzuki-Miyaura reactions of aryl fluorides bearing electron-withdrawing (ketones, esters, and CF3), aryl and alkenyl groups as well as those comprising fused aromatic rings, such as fluoronaphthalenes and fluoroquinolines. The second protocol employs aryl fluorides bearing ortho-directing groups, which facilitate the difficult C-F bond activation process via cyclometalation. N-heterocycles, such as pyridines, quinolines, pyrazoles, and oxazolines, can successfully promote cross-coupling with an array of organoboronic esters. A study into the substituent effects with respect to both coupling components has provided fundamental insights into the mechanism of the nickel-catalyzed cross-coupling of aryl fluorides.
A comparative study on Co-III-catalyzed direct C-H bond alkenylation of 1-phenylpyrazole derivatives with alkynyl carboxylic acids and arylalkynylsilanes under redox-neutral conditions has been disclosed. These methods show excellent selectivity with good to excellent yields. Trimethylsilylacetylene has been utilized as a vinyl source to obtain the corresponding styrene derivatives. The major differences
Catalyst-controlled mono- and diolefinations of arenes via C–H activation in water with reaction times of tens of minutes.
芳烃的催化控制的单烯烃化和双烯烃化,通过水中的C-H活化,在数十分钟内完成反应。
Mn-Catalyzed Aromatic C–H Alkenylation with Terminal Alkynes
作者:Bingwei Zhou、Hui Chen、Congyang Wang
DOI:10.1021/ja311689k
日期:2013.1.30
The first manganese-catalyzed aromatic C-H alkenylation with terminal alkynes is described. The procedure features an operationally simple catalyst system containing commercially available MnBr(CO)(5) and dicyclohexylamine (Cy(2)NH). The reaction occurs readily in a highlychemo-, regio-, and stereoselective manner delivering anti-Markovnikov E-configured olefins in high yields. Experimental study
A method of producing an aromatic compound of the following formula (3) comprising reacting a compound of the following formula (1) with an olefin compound of the following formula (2) in the presence of a transition metal complex:
(wherein, an Ar
1
ring represents an aromatic hydrocarbon ring or aromatic heterocyclic ring, an Ar
2
ring represents a heterocyclic ring containing X
1
and N*, and the X
1
represents a nitrogen atom or carbon atom and the N represents a nitrogen atom connecting via a double bond to either one of two adjacent atoms in the Ar
2
ring.)
(wherein, R
1
, R
2
, R
3
and R
4
represent each independently a hydrogen atom, an alkyl group having 1 to 10 carbon atoms or an aryl group having 6 to 18 carbon atoms.)
(wherein, Ar
1
, Ar
2
, X
1
, N*, R
1
, R
2
and R
3
represent the same meanings as described above.).
Acetic Acid-Promoted Rhodium(III)-Catalyzed Hydroarylation of Terminal Alkynes
作者:Chang-Lin Duan、Xing-Yu Liu、Yun-Xuan Tan、Rui Ding、Shiping Yang、Ping Tian、Guo-Qiang Lin
DOI:10.1055/s-0037-1611780
日期:2019.5
Rhodium(III)-catalyzed hydroarylation of terminal alkynes has not previously been achieved because of the inevitable oligomerization and other side reactions. Here, we report a novel Cp*Rh(III)-catalyzed hydroarylation of terminal alkynes in acetic acid as solvent to facilitate the C–H bond activation and subsequent transformations. This reaction proceeds under mild conditions, providing an effective