substituted 2-aminooxazoles containing 3-hydroxy-4H-pyran-4-one moiety. The considered method includes multicomponent condensation of allomaltol derivatives with α-ketoaldehydes and cyanamide. The distinctive feature of the proposed protocol is formation of 2-aminooxazole core in contrast to related previously described approach leading to urea containing condensed furans. The advantages of this synthesis
我们首次阐述了制备含有 3-羟基-4 H-
吡喃-4-one 部分的取代
2-氨基恶唑的有效一步法。所考虑的方法包括
异麦芽酚衍
生物与 α-酮醛和单
氰胺的多组分缩合。与先前描述的导致含有缩合
呋喃的
尿素的相关方法相比,所提出的协议的显着特征是形成
2-氨基恶唑核。该合成的优点包括容易获得的起始原料、温和的反应条件、原子经济性和易于后处理程序,可以避免色谱纯化。其中,发现获得的
2-氨基恶唑经过以前未知的酸催化再循环成N- (2-aryl-5-methyl-7-oxo-7H-
呋喃[3,2- b ]
吡喃-3-基)乙酰胺。X射线衍射证实了一种
2-氨基恶唑衍
生物和一种取代
呋喃[3,2 - b ]
吡喃的结构。