作者:Tiwari, Ashwani、Khanam, Ariza、Lal, Mohan、Kumar Mandal, Pintu
DOI:10.1002/adsc.202400067
日期:——
report thiouracil-catalyzed α-selective O-glycosylations employing easily accessible glycosyl trichloroacetimidate donors without using any co-catalyst or additive. A variety of alcohol nucleophiles including saccharides, and amino acids with different protecting groups containing glycosyl trichloroacetimidate donors were successfully α-glycosylated using an operationally simple protocol. Moreover, mechanistic
在此,我们报道了硫氧嘧啶催化的α-选择性O-糖基化,使用易于获得的糖基三氯乙酰亚胺酯供体,而不使用任何助催化剂或添加剂。使用操作简单的方案成功地将多种醇亲核试剂(包括糖类和具有不同保护基团的含有糖基三氯乙酰亚胺酯供体的氨基酸)进行α-糖基化。此外,机理研究表明硫氧嘧啶在此糖基化过程中起到布朗斯台德酸/碱催化作用。