Synthesis of raffinose family oligosaccharides by regioselective de-O-benzylation with Co2(CO)8/Et3SiH/CO system
作者:Yue-tao Zhao、Shan Niu、Lu-bai Huang、Ji-ming Wang、Zhao-jun Yin、Qing Li、Zhong-jun Li
DOI:10.1016/j.tet.2013.03.094
日期:2013.6
key step is the regioselective de-O-benzylation with Co2(CO)8/Et3SiH/CO system, followed by a high α-selective glycosylation. The newly developed de-O-benzylation system is efficient in removing the primary benzyl groups of sucrose and raffinose under mild condition and with high selectivity. Using thioglycoside as donor, NIS/AgOTf as promoter and DTBMP as additive, glycosylation of acid labile sucrose
提出了一种方便的方法,以蔗糖为原料合成棉子糖,水苏糖和马齿c糖。关键步骤是使用Co 2(CO)8 / Et 3 SiH / CO系统进行区域选择性脱O-苄基化,然后进行高水平的α-选择性糖基化。新开发的脱-O-苄基化系统可在温和条件下以高选择性高效去除蔗糖和棉子糖的伯苄基。使用硫代糖苷作为供体,NIS / AgOTf作为启动子,DTBMP作为添加剂,酸不稳定蔗糖底物的糖基化可以实现高收率。