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Fast-atom bombardment mass spectrometric studies of trisubstituted 3a,4,5,11-tetrahydro- 6H-1,2,4-oxadiazolo[4,5-a][1,5]benzodiazepines

✍ Scribed by Jiaxi Xu; Haitao Wu; Sheng Jin

Publisher: John Wiley and Sons
Year: 1999
Tongue: English
Weight: 66 KB
Volume: 13
Category: Article
ISSN: 0951-4198
DOI: 10.1002/(sici)1097-0231(19990530)13:10<963::aid-rcm586>3.0.co;2-l

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✦ Synopsis

The mass spectrometric behaviour of seven 1,3a,5-trisubstituted 3a -oxadiazolo[4,5-a][1,5]benzodiazepines has been studied with the aid of mass-analyzed ion kinetic energy spectrometry and exact mass measurements using fast-atom bombardment ionization. All compounds show a tendency to eliminate a neutral substituted or unsubstituted styrene from the diazepine ring to yield 1,2,4-oxadiazolo[4,5-a][1,3]benzimidazole ions, and further undergo reverse 1,3-dipolar cycloadditions to give benzimidazole ions. The formation of stable conjugated fused tetracyclic systems, substituted 1,2,4oxadiazolo[4,5-f]phenanthridine ions, was also observed.

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