Synthesis and Antiradiation Activity of Some Sulfur Containing Thiophene Derivatives
作者:A.Y. Hassan、M.M. Ghorab、O.M. Nassar
DOI:10.1080/10426509808545453
日期:1998.2.1
2-dicyano-1-ethylamino or benzylamino- 1 methylethyl)thiophene (5a,b). Treatment of (2) with elemental sulfur yielded directly the cyclised product 2-(5-amino-4-cyano-3-thienyl)thiophene (6). On the other hand refluxing (2) in pyridine with carbon disulfide gave the pyridine-1,3-dithione derivative (7). Condensation of (2) with phenyl isocyanate and/or phenyl isothiocyanate afforded 6-amino-4-(2-thienyl)-1
2-(2,2-二氰基-1-甲基乙烯基)噻吩(2)与苯肼缩合得到相应的2-(1-苯肼基乙基)-噻吩(4)。化合物(4)也通过(1)与苯肼的反应获得。(2)与胺的反应得到2-(2,2-二氰基-1-乙氨基或苄氨基-1甲基乙基)噻吩(5a,b)。用元素硫处理(2)直接产生环化产物2-(5-氨基-4-氰基-3-噻吩基)噻吩(6)。另一方面,在吡啶中用二硫化碳回流(2)得到吡啶-1,3-二硫酮衍生物(7)。(2)与异氰酸苯酯和/或异硫氰酸苯酯缩合得到6-氨基-4-(2-噻吩基)-1,2-二氢-2-氧代-1-苯基吡啶-5-甲腈(9)和/或5 -(2-thienyl)-2,7-dithioxo-3,8-N-phenyl-1,2,3,7,8-pentahydropyrido[2,3-d]pyrimidine-4-imine (11)。当与肉桂腈(12)反应时,二氰基衍生物(2)也提供2-(3-氨基-2,4-