constrained binuclear palladium catalyst system affords selective thioetherification of a wide range of functionalized arenethiols with chloroheteroaromatic partners with the highest turnover numbers (TONs) reported to date and tolerates a large variety of reactive functions. The scope of this system includes the coupling of thiophenols with six‐ and five‐membered 2‐chloroheteroarenes (i.e., functionalized
The metalation of thioethers, methyl and phenyl sulfoxides and sulfones of pyrazine and pyridazine has been performed. Methyl sulfoxides and sulfones were first metalated on the methyl group. The ortho directing effect of thioethers, sulfoxides and sulfones have been compared with the methoxy group. The sulfoxides were shown to be very good ortho directing groups.
Takabayashi, Yakugaku Zasshi/Journal of the Pharmaceutical Society of Japan, 1956, vol. 76, p. 1293,1295
作者:Takabayashi
DOI:——
日期:——
A Highly Selective, Non-Hydantoin, Non-Carboxylic Acid Inhibitor of Aldose Reductase with Potent Oral Activity in Diabetic Rat Models: 6-(5-Chloro-3-methylbenzofuran- 2-sulfonyl)-2-<i>H</i>-pyridazin-3-one
作者:Banavara L. Mylari、Sandra J. Armento、David A. Beebe、Edward L. Conn、James B. Coutcher、Michael S. Dina、Melissa T. O'Gorman、Michael C. Linhares、William H. Martin、Peter J. Oates、David A. Tess、Gregory J. Withbroe、William J. Zembrowski
DOI:10.1021/jm034065z
日期:2003.6.1
We report here on the discovery path that led to a structurally unprecedented non-hydantoin, non-carboxylic acid aldose reductase inhibitor, 24, which shows remarkably potent oral activity in normalizing elevated sorbitol levels and, more significantly, fructose levels in the sciatic nerve of chronically diabetic rats, with ED90 values of 0.8 and 3 mpk, respectively. It is well absorbed in rats (oral bioavailability, 98%) and has a long plasma t(1/2) (26 +/- 3 h).
Palladium-catalyzed heteroaryl thioethers synthesis overcoming palladium dithiolate resting states inertness: Practical road to sulfones and NH-sulfoximines
provide efficient synthetic access to heteroaryl sulfones in two-steps using a simple palladium–1,1′-bis[(diphenyl)phosphanyl]ferrocene catalyst to form in high yields variously functionalized heteroaromatic thioethers. Pyridinyl-containing substrates can be subsequently selectively oxidized into sulfones and NH-sulfoximines by using very mild oxidation conditions with a high functional group tolerance