On the formation and reactivity of<i>N</i>(2),<i>N</i>(2′)-tetrasubstituted 2,4-diamino-5-(2-amino-4-thiazolyl)thiazoles
作者:Ronald Flaig、Horst Hartmann
DOI:10.1002/jhet.5570340433
日期:1997.7
By the reaction of weak bases with N(2)-disubstituted 2-amino-4-thiazoliniminium chlorides 3, easily available by the reaction of thioureas 1 with α-chloroacetonitrile 2, N(2),N(2′)-persubstituted 2,4-diamino-5-(2-amino-4-thiazolyl)thiazoles 8 are formed. These new bis-thiazoles react, as exemplified with the dimorpholino derivative 8a, with different electrophilic reagent, such as phenyl isothiocyanate
通过弱碱与N(2)-二取代的2-氨基-4-噻唑啉亚胺氯化物3的反应,可以容易地通过硫脲1与α-氯乙腈2的反应得到N(2),N(2')-取代2形成了4-4-二氨基-5-(2-氨基-4-噻唑基)噻唑8。这些新的双噻唑以双吗啉代衍生物8a为例,与不同的亲电试剂(例如异硫氰酸苯酯9、4-硝基-苯基重氮盐11或4-二烷基氨基苯甲醛13)在其5 H取代的噻唑部分反应生成相应的硫代苯胺10,偶氮化合物12和次甲基染料14。用亚硝酸钠和Vilsmeier试剂通过以下方法转化噻唑8a不稳定的中间体,进入三环2,7-二吗啉代噻唑并[4,5 - c ]噻唑并[4,5- e ]哒嗪16和2,7-二吗啉代噻唑并[4,5 - b ]噻唑并[4,5- d ]吡啶19。