Evidences of some unusual behaviours of 2-aminothiazol and 2-aminobenzothiazol in reactions with formaldehyde and glyoxal
作者:Mehdi Ghandi、Abolfazl Olyaei
DOI:10.1002/jhet.5570440207
日期:2007.3
In contrast to the previously reported acid-catalyzed reaction of 2-aminothiazole with aqueous formaldehyde in water at 0-5 °C which afforded N,N′-bis(2-thiazolyl)methanediamine (4), 5,5′-methylenebis(2-aminothiazole) (5) is obtained as the unique product under reflux conditions. Reaction of 2-aminobenzothiazole with aqueous formaldehyde in acetonitrile at 0-5 °C or under reflux conditions produces
与先前报道的2-氨基噻唑与甲醛水溶液在0-5°C的水中的酸催化反应相反,该反应可得到N,N'-双(2-噻唑基)甲烷二胺(4),5,5'-亚甲基双(在回流条件下获得独特的产物2-氨基噻唑)(5)。2-氨基苯并噻唑与甲醛水溶液在乙腈中于0-5°C或在回流条件下反应分别生成(2-苯并噻唑基氨基)甲醇(6)或N,N'-双(2-苯并噻唑基)甲烷二胺(7)。加热乙腈中的单胺6会明显产生对称的二胺7。当2-氨基噻唑与乙二醛水溶液在乙腈中进行环缩合时,得到3,4,8,9-四羟基-7,10-双(2-噻唑基)-2,5-二氧杂-7,10-二氮杂双环[4.4.0]癸烷(8)2-氨基苯并噻唑与乙二醛的反应未能产生相似的结果;在甲醛水溶液中,尽管前一反应导致形成4-羟基-5-(噻唑基氨基)-1,3-双(2-噻唑基)咪唑烷(9),但利用2-氨基苯并噻唑可得到4,5 -二羟基-1,3-双(2-苯并噻唑基)咪唑烷(10)。