8-(Dimethylamino)-3-(2-hydroxy-3-phenoxypropyl)-xanthine has been obtained from 6-amino-1-(2-hydroxy-3-phenoxypropyl)uracil by an azodicarboxylate Michael-type addition involving a reactive diene. 6-Amino-1-(2-hydroxy-3-phenoxy-propyl)uracil was easily prepared from racemic 2-amino-5-(phenoxymethyl)-2-oxazoline. Moreover, these chemical investigations also led to the identification of a racemic 7-aminooxazolo[5,4-d]pyrimidin-5(6H)-one, obtained by the condensation reaction of the phosgeniminium chloride, Viehe’s salt, with 5,6-diamino-1-(2-hydroxy-3-phenoxypropyl)uracil.
8-(二甲基
氨基)-3-(2-羟基-3-苯氧基丙基)-
黄嘌呤是由 6-
氨基-1-(2-羟基-3-苯氧基丙基)
脲嘧啶通过偶氮二
甲酸酯迈克尔型加成反应(涉及一个活性二烯)而得到的。6-
氨基-1-(2-羟基-3-苯氧基丙基)尿
嘧啶很容易从外消旋 2-
氨基-5-(苯氧基甲基)-2-
噁唑啉中制备出来。此外,这些
化学研究还发现了一种外消旋 7-
氨基
恶唑并[5,4-d]
嘧啶-5(6H)-酮,它是由
光气基
氯化铵(维赫盐)与 5,6-二
氨基-1-(2-羟基-3-苯氧基丙基)
脲嘧啶发生缩合反应而得到的。