An oxadiazole compound and process of making same, is represented by Formula I:
wherein
R
1
represents a substituted or unsubstituted straight, branched, or cyclo-alkyl group having at least two carbon atoms, and
R
2
represents an alkyl, aryl, or heteroaryl group.
SYNTHESIS OF 5-ß-KETO-1,2,4-OXADIAZOLES AND CONVERSION OF 5-ß-KETO-1,2,4-OXADIAZOLES TO N-PYRAZOLYL AMIDOXIMES
申请人:Fuji Hunt Photographic Chemicals, Inc.
公开号:EP2013190A2
公开(公告)日:2009-01-14
Synthesis of 5-Beta-Keto-1,2,4-Oxadiazoles and Conversion of 5-Beta-Keto-1,2,4 Oxadiazoles to N-Pyrazolyl Amidoximes
申请人:Jensen David R.
公开号:US20090221834A1
公开(公告)日:2009-09-03
The disclosed invention relates to a process for preparing 5-β-keto-1,2,4-oxadiazoles of formula (I), and conversion of 5-β-keto-1,2,4-oxadiazoles (I) into N-pyrazolyl amidoximes of the formula (II) through reaction with hydrazine. The process is defined by two steps. An amidoxime, which may be prepared in situ, is condensed with a β-keto ester to form a 5-β-keto-1,2,4-oxadiazole. The 5-β-keto-1,2,4-oxadiazole is subsequently reacted with hydrazine to furnish the desired N-pyrazolyl amidoxime. The disclosed invention provides several advantages over the current state of the art for the synthesis of N-pyrazolyl amidoximes, which require the condensation of a pyrzolylamine with an actived substrate and subsequent reaction with hydroxyl amine. N-pyrazolyl amidoximes are useful synthetic intermediates, especially for the preparation of photographic developing chemicals.