Neue Benzothiazine, II. 3.4-Dihydro-2H-1.2-benzothiazinon-(3)-1.1-dioxid und 3.4-Dihydro-1H-2.3-benzothiazinon-(4)-2.2-dioxid
✍ Scribed by Sianesi, Enrico ;Redaelli, Riccardo ;Bertani, Marco ;Re, Paolo Da
- Publisher
- Wiley (John Wiley & Sons)
- Year
- 1970
- Tongue
- English
- Weight
- 641 KB
- Volume
- 103
- Category
- Article
- ISSN
- 0009-2940
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## Abstract A new method for the preparation of 4‐substituted 3,4‐dihydro‐1__H__‐2,1,3‐benzothiadiazine 2,2‐dioxides is described. Treatment of __t__‐butyl __N__‐phenylsulfamoylcarbamate derivatives (**1**) with different aldehydes afforded the corresponding intramolecular cyclized products **2** u
## Abstract The mass fragmentation behaviour of 3,4‐dihydro‐1__H__‐2,3‐benzothiazine 2,2‐dioxides was studied. The rationalizations suggested are supported by accurate mass measurements, metastable evidence and deuterium labelling.
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