Pyrazolo[2′,3′:3,4][1,3]oxazino[5,6- b]quinoxaline, a novel tetracyclic ring system

• Published in: Tetrahedron letters Vol. 44; no. 51; pp. 9161 - 9164
• Main Authors: Banekovich, Christian, Mereiter, Kurt, Matuszczak, Barbara
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 15-12-2003
• Subjects: novel ring system; pyrazolo[2′,3′:3,4][1,3]oxazino[5,6- b]quinoxaline; tetracyclic system; novel ring system; pyrazolo[2′,3′:3,4][1,3]oxazino[5,6- b]quinoxaline; tetracyclic system
• ISSN: 0040-4039; 1873-3581
• DOI: 10.1016/j.tetlet.2003.10.043

Reaction of 2-chloro-3-(3-chloro-1
H-pyrazol-5-yl)quinoxaline and aldehydes does not afford the corresponding
N-(α-hydroxyalkylated) derivatives but results in a cyclisation reaction to give a derivative bearing the hitherto undescribed pyrazolo[2′,3′:3,4][1,3]oxazino[5,6-
b]quinoxaline system.
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