Synthese von [1,1,3-Trioxo-1,2-benzisothiazol-2(3H)-yl]keten-S,S-acetalen und deren Hydrazinolyse
✍ Scribed by Dölling, Wolfgang ;Herrmann, Cornelia ;Augustin, Manfred
- Publisher
- John Wiley and Sons
- Year
- 1990
- Tongue
- English
- Weight
- 263 KB
- Volume
- 1990
- Category
- Article
- ISSN
- 0947-3440
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✦ Synopsis
Synthesis of [1,1,3‐Trioxo‐1,2‐benzisothiazol‐2(3__H__)‐yl]ketene S,S‐Acetals and Their Reaction with Hydrazine Hydrate
The previously unknown ketene S,S‐acetals 2, 3, and 4 are prepared by dithiocarboxylation reaction of methylene‐active saccharin derivatives 1 in the presence of sodium hydride/carbon disulfide in dry DMF followed by alkylation. Compounds 2a, 3a, and 4a are treated with hydrazine hydrate (85%) to give 2‐hydrazono‐3,3‐bis(methylthio)propiophenone (6a) and methyl or ethyl pyruvate 6b or 6c, respectively.
📜 SIMILAR VOLUMES
## Eingegangen am 13. Juli 1981 Aus den (E)-(b-Acylviny1)phosphonaten 1 werden mit Cyclopentadien die isomeren Norbornylphosphonate 2 (endo-Acyl, exo-P) und 3 (exo-Acyl, endo-P) im Verhaltnis 7: 3 erhalten. Mit 1,3-Cyclohexadien liefert 1 a die entsprechenden Bicyclooctenyl-Derivate 7 und 8. Aus d