89346-88-3Relevant academic research and scientific papers
Assessment and use of two silicon carbide multi-well plates for library synthesis and proteolytic digests using microwave heating
Stencel, Lauren M.,Kormos, Chad M.,Avery, Keri B.,Leadbeater, Nicholas E.
experimental part, p. 2452 - 2457 (2009/09/26)
The use of two silicon carbide plates is reported for the preparation of three libraries of organic molecules using microwave heating. In addition, a preliminary study has been carried out, showing that one of the plates can also be used in a proteomics setting. Both the 24-position and 48-position plates heated evenly when irradiated with microwave energy. The 48-position plate was used to prepare a library of N-aryl functionalized β-amino esters via an aza-Michael reaction between anilines and Michael acceptors. The 24-position plate was used to prepare a library of biaryls via a Suzuki coupling methodology and a library of 1,4-dihydropyridines via a Hantzsch synthesis. The 48-position plate was also used to perform the proteolytic digestion of insulin chain B by trypsin. The Royal Society of Chemistry 2009.
Suzuki coupling catalyzed by ligand-free palladium(II) species at room temperature and by exposure to air
Deng, Yijian,Gong, Liuzhu,Mi, Aiqiao,Liu, Hui,Jiang, Yaozhong
, p. 337 - 339 (2007/10/03)
Ligand-free palladium acetate and palladium chloride have been evaluated as catalysts in the Suzuki cross-coupling of aryl boronic acid with aryl and vinyl bromide in ethanol at room temperature and with exposure to air. The substrates with a wide variety of functional groups, including base-sensitive ones are tolerated.
Phase-Transfer-Catalyzed Gomberg-Bachmann Synthesis of Unsymmetrical Biarenes: A Survey of Catalysts and Substrates
Beadle, James R.,Korzeniowsky, Stephen H.,Rosenberg, David E.,Garcia-Slanga, Blanche J.,Gokel, George W.
, p. 1594 - 1603 (2007/10/02)
Two problems have hindered the Gomberg-Bachmann (GB) and Pschorr reactions of arenediazonium cations: the instability of the arenediazonium salts and side reactions.Arenediazonium tetrafluoroborate and hexafluorophosphate salts can be prepared in high yield and purity and can be stored safely.Unfortunately, these salts are insoluble in most nonpolar organic solvents.Crown ether complexation or other phase-transfer (pt) catalytic methodology can ameliorate this situation, and reactions conducted by the approaches outlined herein often afforded coupling or cyclization products in high yield and corresponding purity.The use of crown ethers, quarternary 'onium salts, lipophilic carboxylic acid salts, and even the polar cosolvent acetonitrile increase the utility of the ptGB reaction dramatically.Sixty examples of couplings are reported along with an assessment of selectivities.A number of examples are also presented of phase-transfer-type Pschorr cyclizations.In the latter case, the use of potassium superoxide, KO2, is introduced to suppress indazole formation.
