Studien zur Chemie von thienoanellierten O,N-und S,N-haltigen Heterocyclen, 5. Mitt.: Ein Zugang zum Thieno[2,3-b][1,4]oxazin-Ringsystem |
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| Authors: | I Puschmann T Erker |
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| Institution: | (1) Institut für Pharmazeutische Chemie, Universität Wien, A-1090 Wien, Österreich |
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| Abstract: | Summary The reactivity of 5-acetyl-2-chloro-3-nitrothiophene with  -hydroxyesters is described. The influence of the solvent (DMF, tetrahydrofurane, toluene) and of the used base is discussed. These reactions provide an access to substituted thiophene derivatives, which were cyclized after reduction by iron powder/glacial acetic acid to give thieno 2,3-b]1,4]oxazine derivatives. |
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| Keywords: | Thieno[2 3-b][1 4]oxazines Nucleophilic substitution |
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