Synthesis of the novel thieno[4,3,2-ef][1,4]benzoxazepine ring system: 4,5-Dihydro-3-(4-pyridinyl)thieno[4,3,2-ef][1,4]benzox-azepine maleate
作者:John D. Tomer、Gregory M. Shutske、Dirk Friedrich
DOI:10.1002/jhet.5570340621
日期:1997.11
4,5-Dihydro-3-(4-pyridinyl)-thieno[4,3,2-ef][1,4]benzoxazepine maleate 2 has been synthesized from 3-amino-4-fluorobenzo[fc]thiophene by employing an intramolecular nucleophilic aromatic fluoride displacement. In the presence of strong base and heat, 2 rearranges to form the isomeric hemiaminal, 3,4-dihydro-4-methyl-3-(4-pyridinyl)thieno[4,3,2-ef][1,3]benzoxazine 10. A proposed mechanism for this rearrangement
4,3-二氢-3-(4-吡啶基)-噻吩并[4,3,2-ef] [1,4]苯并x氮杂马来酸酯2是由3-氨基-4-氟苯并[fc]噻吩合成的。分子内亲核芳族氟化物的置换。在强碱和热的情况下,2重排形成异构的半缩醛异构体3,4-二氢-4-甲基-3-(4-吡啶基)噻吩并[4,3,2-ef] [1,3]苯并恶嗪10。讨论了一种针对这种重排的建议机制。