Nickel-Catalyzed Cyanation of Aryl Halides and Hydrocyanation of Alkynes via C–CN Bond Cleavage and Cyano Transfer
作者:Hui Chen、Shuhao Sun、Yahu A. Liu、Xuebin Liao
DOI:10.1021/acscatal.9b04586
日期:2020.1.17
methods to prepare aryl nitriles and vinyl nitriles from arylhalides and alkynes, respectively. Using inexpensive and non-toxic 4-cyanopyridine N-oxide as the cyano shuttle, the methods provide an efficient approach to prepare aryl cyanides and vinyl nitriles under mild and operationally simple reaction conditions with a broad range of functional group tolerance. In hydrocyanation of alkynes, the method
Suzuki Coupling of 2‐Chloroacrylonitrile, Methyl 2‐Chloroacrylate, or 2‐Chloroprop‐1‐en‐3‐ol with Arylboronic Acids Catalyzed by a Palladium‐Tetraphosphine Complex
作者:Florian Berthiol、Henri Doucet、Maurice Santelli
DOI:10.1080/00397910600773866
日期:2006.10
The tetraphosphine all-cis-1,2,3,4-tetrakis(diphenylphosphinomethyl) cyclopentane (Tedicyp) in combination with [Pd(C3H5)Cl](2) affords an efficient catalyst of the coupling of 2-chloroacrylonitrile with arylboronic acids. In the presence of 1% catalyst, the 2-arylacrylonitrile derivatives were obtained in medium to good yields. A variety of substituents such as alkyl, methoxy, fluoro, trifluoromethyl, formyl, or nitro on the arylboronic acid are tolerated. The cross-coupling reactions of methyl 2-chloroacrylate with arylboronic acids give simple access to 2-phenylacrylate derivatives, which are useful precursors for the synthesis of biologically active compounds such as ibuprofen, ketoprofen, and naproxen.
Nickel-Catalyzed Highly Regioselective Hydrocyanation of Terminal Alkynes with Zn(CN)<sub>2</sub> Using Water as the Hydrogen Source
作者:Xingjie Zhang、Xin Xie、Yuanhong Liu
DOI:10.1021/jacs.8b02542
日期:2018.6.20
The first efficient and general nickel-catalyzed hydrocyanation of terminal alkynes with Zn(CN)(2) in the presence of water has been developed. The reaction provides a regioselective protocol for the synthesis of functionalized vinyl nitriles with a range of structural diversity under mild reaction conditions while obviating use of the volatile and hazardous reagent of HCN. Deuterium-labeling experiments confirmed the role of water as the hydrogen source in this hydrocyanation reaction.
BENZIMIDAZOLE DERIVATIVES, PROCESS FOR THEIR PREPARATION AND THEIR APPLICATION