From the alkali-catalysed reaction of thiouracil with bromoacetaldehyde diethyl acetal three products are isolated in nearly the same quantity: 2-(2, 2-diethoxyethylthio)-uracil (2) and two cyclization products: 3, a thiazolo[3, 2-a]pyrimidin-5-one, and 4, athiazolo[3, 2-a]pyrimidin7-one. By warming with acid both 2 and 4 yield 3. Rearrangement of 4 to 3 proceeds also by heating the hydrochloride.
从
硫尿
嘧啶与
溴乙醛二
乙缩醛的碱催化反应中,分离出几乎相同量的三种产物:2-(2,2-二乙氧基乙
硫基)-尿
嘧啶(2)和两种环化产物:3,
噻唑[3,2- a ]
嘧啶-5-一和4,
硫唑[3,2- a ]
嘧啶7-一。用酸加温2和4都可得到3。也可以通过加热盐酸盐来进行4至3的重排。还描述了导致
噻唑并[3,2- d ]
吡咯并[2,3-d]
嘧啶-5-酮的类似环化。
溴代用品3在
伯胺或仲胺处理后,
溴衍
生物6得到7-
氨基化合物。