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

✍ Scribed by Jiaxi Xu; Haitao Wu; Sheng Jin

Publisher: John Wiley and Sons
Year: 1999
Tongue: English
Weight: 47 KB
Volume: 13
Category: Article
ISSN: 0951-4198
DOI: 10.1002/(sici)1097-0231(19990530)13:10<908::aid-rcm584>3.0.co;2-i

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✦ Synopsis

The fragmentation pathways of nineteen 1,3a,5-trisubstituted 3a ,4,5,2,4d][1,5]benzothiazepines have 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 propene, or substituted or unsubstituted styrene, from the thiazepine ring to yield 1,2,4oxadiazolo[5,4-b][1,3]benzothiazole ions, and further undergo reverse 1,3-dipolar cycloadditions to give benzothiazole ions. The formation of stable conjugated fused tetracyclic systems, substituted 1,2,4oxadiazolo[5,4-f]phenanthridine ions, was also observed.

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