The reactions of some bromo-derivatives of compounds having reactive methylene groups with thioureas, and of some resultant thiouronium salts with base
作者:Douglas Lloyd、Ross W. Millar
DOI:10.1016/0040-4020(80)80140-2
日期:1980.1
Whereas α-bromocarbonyl compounds react with thiourea to give thiazole derivatives, bromomalononitrile and bromobis(phenylsulphonyl)methane underwent protodebromination. With N,N,N',N'-tetramethylthiourea many of the bromo-compounds gave thiouronium salts but protodebromination sometimes supervened. N,N'-Disubstituted thioureas provided examples of salt formation, protodebromination and cyclisation
α-溴代羰基化合物与硫脲反应生成噻唑衍生物,而溴代苯甲腈和溴代双(苯基磺酰基)甲烷则进行了原去溴化反应。在使用N,N,N',N'-四甲基硫脲的情况下,许多溴化合物生成了硫脲盐,但原溴代取代有时被取代。N,N′-二取代的硫脲提供了盐形成,原脱溴和环化反应的实例。在用碱处理时提供叶立德的唯一硫脲盐是S- [双(苯基磺酰基)甲基] -N,N,N',N'-四甲基硫脲溴酸盐。N,N′-二取代的盐产生异硫脲而不是酰化物。当与对硝基苯甲醛一起加热时,硫脲鎓二氰基甲基化物进行环化反应而不是Wittig反应,并且该醛与所得的2-氨基噻唑缩合。