Nitroalkene ring closure route to carbon-linked scaffolds for mimicking α-d-mannopyranosyl natural linkage
作者:Božena Pribulová、Hana Kováčová、Jana Jakubčinová、Marek Baráth、Alexandra Blahušiaková、Mária Petrušová、Ladislav Petruš
DOI:10.1007/s00706-020-02614-5
日期:2020.6
two latter C-α-d-mannopyranosyl scaffolds by acid hydrolysis into respective reactive free amine or aldehyde forms were developed as well. Detailed reinvestigation of the classical method of preparation of d-mannosyl nitromethanes by thermal dehydration of a 1-deoxy-1-nitroalditol derived from d-mannose showed a maximum occurrence of only 18% of the required α-d-mannopyranosyl anomer. Graphic abstract
抽象的对照治疗3,4,5,6,7-五ø -乙酰基-1,2-二脱氧-1-硝基d -manno -庚-1- enitol用在甲醇中的甲醇钠被去阳离子化的点处停止提供约等摩尔的α - d-甘露聚糖基和β - d-甘露聚糖基硝基甲烷的混合物,通过化学吸附色谱法在阳离子交换树脂上以Ba 2+形式分离目标α-异头物,收率为36%。将上述混合物与氢氧化亚铁直接还原为相应的胺,然后进行选择性N-乙酰化和具有稳定环结构的两个相关异构体的类似色谱分离,得到N-乙酰基-C - α - d-甘露吡喃糖基-甲基胺。初始环形成与上述给定的产品比酸化甲醇反应的替代停止发起随后的夫反应和α - d -mannopyranosyl甲醛二甲基乙缩醛,然后色谱从其分离β异构体上的OH阴离子交换树脂-形式。后两个C - α - d的活化还开发了通过酸水解成相应的反应性游离胺或醛形式的-甘露吡喃糖基支架。通过热脱水衍生自d-甘露糖