Reactions of 2-amino-3-cyano-4,5,6,7-tetrahydrobenzo[b]thiophene and 2-amino-3-cyano-4,7-diphenyl-5-methyl-4H-pyrano[2,3-c] pyrazole with phenylisocyanate, carbon disulfide, and thiourea
作者:Ahmed S. A. Youssef、Kamal A. Kandeel、Fouli A. Fouli、Wael S. I. Abou-Elmagd
DOI:10.1002/hc.20070
日期:——
2-Amino-3-cyano-4,5,6,7-tetrahydrobenzo[b]thiophene 1a or 2-amino-3-cyano-4,7-di- phenyl-5-methyl-4H-pyrano[2,3-c]pyrazole 2a reacted with phenylisocyanate in dry pyridine to give 2-(3-phenylureido)-3-cyanobenzo[b]thiophene 1b or 2-disubstituted amino-3-cyanopyranopyrazole 2b derivative. However, when 1a and 2a were refluxed with carbon disulfide in 10% ethanolic sodium hydroxide solution, they afforded
2-氨基-3-氰基-4,5,6,7-四氢苯并[b]噻吩1a或2-氨基-3-氰基-4,7-二苯基-5-甲基-4H-吡喃[2,3 -c]吡唑 2a 在无水吡啶中与异氰酸苯酯反应,得到 2-(3-苯基脲基)-3-氰基苯并[b]噻吩 1b 或 2-二取代氨基-3-氰基吡唑并吡唑 2b 衍生物。然而,当 1a 和 2a 与二硫化碳在 10% 氢氧化钠乙醇溶液中回流时,它们得到了噻吩并[2,3-d]嘧啶-2,4-二硫酮衍生物 5,在前一种情况下,2,4-二氰基- 1,3-双(二硫代羧氨基)环丁酯-1,3-二烯6和吡唑并吡喃并吡啶并[2,3-d]嘧啶-2,4-二硫酮衍生物7在后者中。在碳酸钾的存在下,在回流的乙醇中用硫脲处理 2a 得到 2,2'-二硫代双嘧啶衍生物 9(主要)以及吡喃并吡唑衍生物 10 和 2,少量的2'-二硫代双乙氧基嘧啶衍生物11。所有产品的结构均由微量分析和光谱数据证实。© 2005