Abstract
New 3-aryl-pyrido[2,1-b][1,3]benzothiazole derivatives 2a–e were synthesized in excellent yields via the reaction of benzothiazoleacetonitrile (1) with different aromatic aldehydes. The treatment of 2-(benzo[d]thiazol-2-yl)-3-(pyridin-4-yl)acrylonitrile (6) with malononitrile afforded 1-amino-3-(pyridin-4-yl)-3H-pyrido[2,1-b][1,3]benzothiazole-2,4-dicarbonitrile (7), which was allowed to react with a variety of reagents to provide pyrimido[5′,4′:5,6]pyrido[2,1-b][1,3]benzothiazole 8, 9 and [1,3]benzothiazolo[3,2-a][1,8]naphthyridine 10, 15 derivatives. All synthesized products were confirmed by elemental analysis, IR, 1H-NMR, 13C-NMR, and mass spectral data.
摘要
新的3-芳基-吡啶并[2,1-b][1,3]苯并噻唑衍生物 2a–e 通过苯并噻唑乙腈 (1) 与不同芳香醛的反应,以极高的产率合成。将2-(苯并[d]噻唑-2-基)-3-(吡啶-4-基)丙烯腈 (6) 与马隆腈处理后得到1-氨基-3-(吡啶-4-基)-3H-吡啶并[2,1-b][1,3]苯并噻唑-2,4-二腈 (7),然后允许其与各种试剂反应,提供吡咪咯[5′,4′:5,6]吡啶并[2,1-b][1,3]苯并噻唑 8、9 和 [1,3]苯并噻唑[3,2-a][1,8]萘啉 10、15 衍生物。所有合成产物均通过元素分析、红外光谱、1H-NMR、13C-NMR 和质谱数据得到确认。