作者:Jared W. Rigoli、Michael E. Østergaard、Kirsten M. Canady、Dale C. Guenther、Patrick J. Hrdlicka
DOI:10.1016/j.tetlet.2009.01.147
日期:2009.4
A protocol for chemoselective deprotection of N,O-acylated ribonucleosides has been developed. Peracylated pyrimidine ribonucleosides subjected to guanidinium nitrate and NaOMe in MeOH/CH2Cl2 at 0 °C undergo high yielding O-deacylation, while even more pronounced chemoselectivity is observed with peracylated purine ribonucleosides as O5′-acyl groups are preserved. Nucleobase-protecting groups (ABz
已经开发出用于N,O-酰化核糖核苷的化学选择性脱保护的方案。在0°C下于MeOH / CH 2 Cl 2中于硝酸胍和NaOMe中进行过酰化的嘧啶核糖核苷进行高产率的O-脱酰化,而由于保留了O5'-酰基,因此在过酰化的嘌呤核糖核苷中观察到的化学选择性更高。核碱基保护基团(A Bz,C Bz,G iBu和U Bz)在这些条件下稳定,使该试剂混合物成为收集核苷化学中保护基方案的宝贵补充。