bis(ethylene acetal) in acetonitrile at −5° gave the corresponding 1-(3,5- di -O- benzoyl -β- d - ribofuranosyl ))-3,5- disubstituted pyridinium chlorides in excellent yield (90%). From the reaction of a series of 2,3-O- isopropylidene -β- d -ribofuranosyl halides with 3-acetyl-5-methyl-pyridine at room temperature, the α -nucleosides were obtained.
摘要3,5-二-O-苯甲酰基-β-d-
呋喃呋喃糖酰
氯分别与3-乙酰基-5-烷基
吡啶,5-烷基-3-甲氧基羰基
吡啶(烷基= Me,Et,Pr和i Pr)缩合, 5-异丙基烟酰胺和3,5-
二乙酰基
吡啶双(
乙缩醛)在-5°的
乙腈中给出相应的1-(3,5-二-O-苯甲酰基-β-d-
呋喃核糖基))-3,5-二取代
吡啶鎓
氯化物,收率极高(90%)。在室温下,通过一系列2,3-O-异亚丙基-β-d-
呋喃呋喃糖基卤化物与3-乙酰基-5-
甲基吡啶的反应,获得了α-核苷。