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
作者:I. Puschmann、T. Erker
DOI:10.1007/bf00812707
日期:——
The reactivity of 5-acetyl-2-chloro-3-nitrothiophene with alpha-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.