Water at elevated temperatures (WET): reactant, catalyst, and solvent in the selective hydrolysis of protecting groups
作者:Wilmarie Medina-Ramos、Mike A. Mojica、Elizabeth D. Cope、Ryan J. Hart、Pamela Pollet、Charles A. Eckert、Charles L. Liotta
DOI:10.1039/c3gc42569j
日期:——
WET has been successfully employed in the removal of protecting groups alleviating the need for added strong acids/bases, subsequent neutralization and waste salt elimination. The protocols for the water-mediated removal of several common protecting groups such as tert-butyl carbamates (N-Boc) from 125 to 150 °C, acetamide (N-Ac) at 275 °C and acetate esters (O-Ac) at 250 °C are reported for different
高温水(WET)在反应过程中可以同时充当反应物,溶剂和催化剂。WET已成功用于去除保护基,从而减少了对添加强酸/碱,中和和消除废盐的需求。水介导去除几个常见保护基的方案,例如从125至150°C的氨基甲酸叔丁酯(N -Boc),在275°C的乙酰胺(N -Ac)和乙酸酯(O报道了不同型号的芳基化合物在250°C下的-Ac)。另外,通过简单地调节温度,证明了高产率和在另一个保护基存在下一个保护基的选择性脱保护。为了进一步了解反应过程,还讨论了几种反应物的水溶性,与这些反应有关的动力学和机理。