Mesoionic isoxazolo[2,3-<i>a</i>]pyrimidinediones and 1,3,4-oxadiazolo[3,2-<i>a</i>]pyrimidinediones as potential adenosine antagonists
作者:Ihsan A. Shehata、Richard A. Glennon
DOI:10.1002/jhet.5570240511
日期:1987.9
Several derivatives of two novel mesoionic ring systems, i.e., isoxazolo[2,3-a]pyrimidinedione and 1,3,4-oxadiazolo[3,2-a]pyrimidinedione, were prepared for evaluation as adenosine antagonists. Whereas both ring systems are relatively stable when the 6-position (i.e., that position corresponding to the purine 1-position) is substituted by an alkyl group, neither ring system is stable when this position
制备了两种新颖的介电环系统的几种衍生物,即异恶唑并[2,3- a ]嘧啶二酮和1,3,4-恶二唑并[3,2- a ]嘧啶二酮,作为腺苷拮抗剂进行评价。当6-位(即对应于嘌呤1-位的那个位置)被烷基取代时,两个环系统都相对稳定,而当该位置未被取代时,两个环系统都不是稳定的。6-未取代的非内消旋异恶唑并嘧啶二酮的实例表现出相似的行为。作为腺苷拮抗剂,发现中离子化合物的效力不及之前评估的中离子噻二唑[3,2- a ]嘧啶二酮类似物。