Directed Manganation of Functionalized Arenes and Heterocycles Using tmp<sub>2</sub>Mn⋅2 MgCl<sub>2</sub>⋅4 LiCl
作者:Stefan H. Wunderlich、Marcel Kienle、Paul Knochel
DOI:10.1002/anie.200903505
日期:2009.9.14
Convenient metalation procedures: Directedmanganationusingtmp2Mn⋅2MgCl2⋅4LiCl leads to the corresponding diorganomanganese reagents in high yields at 0–25 °C. Remarkably, a number of functionalities as well as sensitive heterocycles are tolerated in this metalation procedure (see scheme). The organomanganese species react with a great variety of electrophiles and undergo efficient oxidative amination
The synthesis of bis(1,3,4-oxadiazol-2-yl-phenylmethyl) sulfides and other related 1,3,4-oxadiazoles from 1,1′-diphenylthiodiacetic acid dihydrazide and triethyl orthoesters
作者:Agnieszka Kudelko
DOI:10.1016/j.tet.2011.09.018
日期:2011.11
1′-diphenylthiodiacetic acid dihydrazide and triethyl orthoesters in the presence of catalytic amount of glacial acetic acid resulted in the formation of three heterocyclic products: the appropriate bis(1,3,4-oxadiazol-2-yl-phenylmethyl) sulfides, 2-benzyl-1,3,4-oxadiazoles and 2-benzoyl-1,3,4-oxadiazoles. The presence of the latter two compounds is connected with carbon–sulfur fission in the molecule
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.