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Aryl-substituted 1,10b-dihydro-5H-pyrazolo[1,5-c]-1,3-benzoxazines

✍ Scribed by S. M. Desenko; N. V. Getmanskii; V. N. Chernenko; I. M. Zemlin; O. V. Shishkin; V. D. Orlov

Publisher
Springer US
Year
1999
Tongue
English
Weight
339 KB
Volume
35
Category
Article
ISSN
0009-3122

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Synthesis of some pyrazolo[1,5-c][1,3]be
Synthesis of some pyrazolo[1,5-c][1,3]benzoxazines and a new 5H-pyrazolo[1,5-c][1,3,2]benzoxazaphosphorine ring system
✍ Jan Svetlik; Nada Pronayova; Jiri Kubista πŸ“‚ Article πŸ“… 2005 πŸ› Journal of Heterocyclic Chemistry 🌐 English βš– 93 KB

Condensations of 5-(2-hydroxyphenyl)pyrazoline 3a with 4-carboxybenzaldehyde, glyoxylic acid and N,N'-carbonyldiimidazole leading to pyrazolobenzoxazine derivatives were studied. The observed diastereoselectivity is discussed. Reaction of 3a with Lawesson reagent gave rise to a new 5H-pyrazolo[1,5-c