Palladium-Catalyzed <i>sp</i><sup>2</sup> and <i>sp</i><sup>3</sup> C–H Bond Activation and Addition to Isatin toward 3-Hydroxy-2-oxindoles
作者:Gang-Wei Wang、An-Xi Zhou、Jun-Jiao Wang、Rong-Bin Hu、Shang-Dong Yang
DOI:10.1021/ol402494e
日期:2013.10.18
The first Pd(II)-catalyzed C–Haddition to isatins by direct sp2/sp3 C–H bond activation for the construction of 3-substituted-3-hydroxy-2-oxindoles is reported. The bidentate nitrogen ligands were found to promote this reaction. Specifically, the preliminary bioassay indicated that 3-(5-chlorobenzoxazole)-3-hydroxy-N-benzyl-2-oxindole (2w) is a new inhibitor of human kidney cancer and hepatocellular
Trimethylsilyl-1,3,4-oxadiazoles—new useful synthons for the synthesis of various 2,5-disubstituted-1,3,4-oxadiazoles
作者:Evgenij V. Zarudnitskii、Igor I. Pervak、Anatolij S. Merkulov、Aleksandr A. Yurchenko、Andrej A. Tolmachev
DOI:10.1016/j.tet.2008.08.040
日期:2008.11
The reactivity of 2-aryl-5-trimethylsilyl-1,3,4-oxadiazoles toward different types of electrophiles was investigated. These silanes readily react with chlorine, bromine, aliphatic acyl chlorides, 2-nitrobenzenesulfenyl chloride, and somereactive isocyanates affording the corresponding substituted 1,3,4-oxadiazoles. The reactions with carbonylcompounds proceed only in the presence of F− anions.