Online article for Non-subscribers

Pay per view

Heterocycles has a pay-per-view service for Non-subscribers.
You will be able to directly purchase the full text article through PayPal.
Your purchased Paper can be downloaded after the payment is completed.
An e-mail will be sent the URL to download the paper.
If you have any questions, please contact:

Price: ¥ 4,320 (Yen only)
Period: This Article can be accessed for 7 days.

Report | Regular issue | Vol 20, No. 7, 1983, pp.1335-1339
Published online, 1st January, 1970
DOI: 10.3987/R-1983-07-1335
Synthesis of Pyrazolo[4,3-d]oxazoles from 1-(2,4-Dinitrophenyl)-3-methyl-5-pyrazolon-4-oxime

Mohamed Salah Kamel Youssef

*Chemistry Department, Faculty of Science, Assiut University,Assiut 71516, Egypt


1-(2,4-Dinitrophenyl)-3-methyl-5-pyrazolon-4-oxime (I) reacts with benzylamine to give 1-(2,4-dinitrophenyl)-3-methyl-5-phenyl-1H-pyrazolo[4,3-d]oxazole (II). Its structure has been established by another route involving reaction of I with benzyl cyanide in the presence of sodium ethoxide. 1-(2,4-Dinitrophenyl)-3-methyl-1H-pyrazolo[4,3-d]oxazole (III) has been prepared by the interaction of I with methyl iodide in the presence of K2CO3. Its structure has been elucidated by an unambiguous synthesis involving reaction of diazomethane with I.