Synthetic studies for novel structure of α-nitrogenously functionalized α-fluorocarboxylic acids. Part III. Some reactions of α-bromo-α-fluorocarboxylic acids and their ethyl esters with sodium azide
作者:Yoshio Takeuchi、Kumiko Takagi、Tomokazu Yamaba、Manabu Nabetani、Toru Koizumi
DOI:10.1016/0022-1139(93)03049-r
日期:1994.8
group of α-azido-α-fluorocarboxylic acid derivatives has been attempted by azidation of the corresponding α-bromo-α-fluorocarboxylic acids or ethyl esters. Although ethyl azidofluoroacetate was obtained, over-azidation occurred very readily in most cases to afford geminally diazidated compounds. Attempted conversion of ethyl azidofluoroacetate into azidofluoroacetic acid by alkaline hydrolysis or by treatment
已经尝试通过相应的α-溴-α-氟代羧酸或乙酯的叠氮化来合成一组新的α-叠氮基-α-氟代羧酸衍生物。尽管获得了叠氮基氟乙酸乙酯,但是在大多数情况下非常容易发生叠氮化,从而得到双叠氮化的化合物。尝试通过碱性水解或通过用三甲基甲硅烷基溴处理将叠氮基氟乙酸乙酯转化为叠氮基氟乙酸主要导致形成脱氟产物。已经发现,尽管通常认为α-氟代羧酸盐是稳定的,但是如果在与氟相同的碳原子上存在另外的引入基团,则在亲核条件下会发生脱氟。