nickel-catalyzed oxidative dehydrogenative coupling reaction of alkane with thiol for the construction of C(sp3)-S bond has been established, affording more than 50 alkyl thioethers. Notably, pharmaceutical and agrochemicals, such as Provigil, Chlorbenside and Pyridaben, were readily synthesized by this approach. The sterically hindered ligand BC and disulfide which was formed in situ oxidation of thiol, efficiently
A one-pot, two-stepsynthesis of pyridine-2-ylmethyl thioethers is developed through a TFAA-mediated [3,3]-sigmatropic rearrangement of pyridine N-oxides and TBAB-catalyzed direct conversion of trifluoroacetates into thioethers under metal- and base-free conditions. This methodology enables thiolation of the unactivated methyl C(sp3)–H bond in 2-picolines with thiols. Remarkable features of the method
2-[(Phenylthio)methyl]pyridine derivatives: new antiinflammatory agents
作者:Fortuna Haviv、Robert W. DeNet、Raymond J. Michaels、James D. Ratajczyk、George W. Carter、Patrick R. Young
DOI:10.1021/jm00356a018
日期:1983.2
2-[(Phenylthio)methyl]pyridine derivatives inhibited the dermal reverse passive Arthus reaction (RPAR) in the rat. In the same model, indomethacin was inactive, and hydrocortisone was active. Compounds Ia-d also significantly reduced exudate volume and white blood cell accumulation in the pleural RPAR. This pattern of activity was similar to that of hydrocortisone and different from that of indomethacin
Studies on the Stereoselective Methylation of α-Sulfinyl Carbanions Generated from Three Isomeric Pyridylmethyl<i>p</i>-Tolyl Sulfoxides and Benzyl 2-Pyridyl Sulfoxide
A high stereoselectivity in the methylation of 2-pyridylmethyl p-tolyl sulfoxide (2a) with lithium diisopropylamide and iodomethane was observed at low temperature. The chelation of Li+ by both the nitrogen atom in the pyridine ring and the sulfinyl oxygen atom in 2a promotes the stereoselectivity as compared with isomeric sulfoxides.