Hilbert-Johnson reaction followed by deblocking of the resulting triacetate derivative, 8a, with NaHCO3 in methanol. 10a is apparently the first example of a mesoionic analogue of a pyrimidine nucleoside. It was discovered as a urine metabolite of 4-cyano-3(2H)-pyridazinone (4) in mice. 10a possesses Gram-negative antibacterial activity in vivo against a systemic Escherichia coli infection in mice with
通过使用低温,动力学控制的甲
硅烷基希尔伯特·约翰逊反应,由4-
氰基-3(2H)-
哒嗪酮(4)制备了4-
氰基-3-氧化-1-β-D-
呋喃呋喃糖基
吡啶并鎓(10a)然后用
甲醇中的NaHCO3解封所得的
三乙酸酯衍
生物8a。10a显然是
嘧啶核苷的内消旋类似物的第一个例子。发现它是小鼠体内的4-
氰基-3(2H)-
哒嗪酮(4)的尿代谢产物。10a具有25-50 mg / kg ED50的小鼠体内对全身性大肠杆菌感染的革兰氏阴性抗菌活性。合成了一系列4-取代的3-氧化
吡啶并鎓
核糖核苷11a-h,作为10a的类似物。发现4-
氯-3-氧化-1-β-D-
呋喃呋喃糖基
吡啶并鎓鎓对E的活性是10a的几倍。