A reaction involving an efficient NBS-mediated oxidative N‒O bond formation has been established for the synthesis of 1,2,4-oxadiazoles from readily accessible N-acyl amidines. The features of this synthetic method include simplicity of operation, mild reaction conditions, short reaction times, high yields, and eco-friendliness. The reaction also works well with crude N-acyl amidines obtained by amidation
PYRROLINONE CARBOXAMIDE COMPOUNDS USEFUL AS ENDOTHELIAL LIPASE INHIBITORS
申请人:BRISTOL-MYERS SQUIBB COMPANY
公开号:US20140228321A1
公开(公告)日:2014-08-14
The present invention provides compounds of Formula (I): (I), as defined in the specification and compositions comprising any of such novel compounds. These compounds are endothelial lipase inhibitors which may be used as medicaments.
Efficient and Convenient Protocol for the Synthesis of 3,5-Disubstituted 1,2,4-Oxadiazoles Using HClO<sub>4</sub>-SiO<sub>2</sub> as a Heterogeneous Recyclable Catalyst
Silica-supported perchloric acid (HClO4-SiO2) was found to be a new, highly efficient, inexpensive, and reusable catalyst for a rapid and efficient synthesis of various 1,2,4-oxadiazoles with good to excellent yields under solvent-free conditions. The present methodology has been effectively utilized for the synthesis of oxolamine, an anti-inflammatory drug.
Schulz,O., Chemische Berichte, 1885, vol. 18, p. 1085