Rhodium-Catalyzed Addition of Aryl Boronic Acids to 2,2-Disubstituted Malononitriles
作者:Christian A. Malapit、Donald R. Caldwell、Irungu K. Luvaga、Jonathan T. Reeves、Ivan Volchkov、Nina C. Gonnella、Zhengxu S. Han、Carl A. Busacca、Amy R. Howell、Chris H. Senanayake
DOI:10.1002/anie.201703471
日期:2017.6.6
prepared through Rh‐catalyzed addition of arylboronicacids to 2,2‐disubstituted malononitriles. In contrast to the previously described transnitrilative cyanation of arylboronicacids with dialkylmalononitriles, the present reaction avoids retro‐Thorpe collapse of the intermediate addition product through the use of a milder base. The reaction was amenable to a variety of arylboronicacids and disubstituted
highly efficient electrophilic cyanation of boron enolates using readily available cyanating reagents, N‐cyano‐N‐phenyl‐p‐toluenesulfonamide (NCTS) and p‐toluenesulfonyl cyanide (TsCN), is reported. Various β‐ketonitriles were prepared by this new protocol, which has a remarkably broad substrate scope compared to existing methods. The present method also allowed efficient synthesis of β‐ketonitriles containing
Chemoselective Alkylations with <i>N</i>- and <i>C</i>-Metalated Nitriles
作者:Xun Yang、Dinesh Nath、Fraser F. Fleming
DOI:10.1021/acs.orglett.5b02481
日期:2015.10.2
electrophilic alkylations. N-Lithiated or C-magnesiated nitriles can be prepared from the same nitrile precursor and selectively reacted with a 1:1 mixture of methyl cyanoformate and benzyl bromide or bifunctionalelectrophiles through chemoselective attack onto either an alkyl halide or a carbonyl electrophile. A mechanistic explanation for the chemoselectivity preferences is provided that rests on the structural
Nickel Catalyzed Selective Arylation of Geminal Dinitriles: Direct Access to α-Cyano Carbonyl Compounds
作者:Anwesha Bhattacharya、Subhashini V. Subramaniam、Nagesh Kumar Kandukuri、Saravanan Peruncheralathan
DOI:10.1021/acs.joc.3c02595
日期:2024.2.16
The catalytic intermolecular arylation of disubstituted geminal dinitriles with in situ generated arylnickel complexes is disclosed. This method efficiently provides various all-carbon substituted α-cyanocarbonyl compounds without additives and an inert atmosphere. It also demonstrates the arylation of R-BINOL and S-BINOL derived geminal dinitriles, preserving optical purity. Mechanistic studies proved
Phase-transfer catalyzed formation of .alpha.-cyano ketones from ketone aroylhydrazones in NaCN(aq)-inert organic solvent system
作者:Toshiro Chiba、Mitsuhiro Okimoto
DOI:10.1021/jo00021a038
日期:1991.10
Alpha-Cyanoalkyl aryl ketones can be obtained from ketone aroylhydrazones by heterogeneous reaction with aqueous sodium cyanide, an inert organic solvent, and acetic acid in the presence of air and a catalytic amount of a quaternary ammonium salt. The initially formed HCN adducts undergo air oxidation followed by alkaline-induced decomposition affording the alpha-cyanoalkyl ketones. The phase-transfer catalyst promotes all three reactions.