The Dimethoxyphenylbenzyl Protecting Group: An Alternative to the <i>p</i>-Methoxybenzyl Group for Protection of Carbohydrates
作者:Gregory M. Rankin、Isobel Maxwell-Cameron、Gavin F. Painter、David S. Larsen
DOI:10.1021/jo4004184
日期:2013.6.7
to these reaction conditions. The selective cleavage of allyl, p-bromobenzyl, and PMB ethers in protected carbohydrates containing DMPBn ethers are also demonstrated. This work establishes the 4-(3,4-dimethoxyphenyl)benzyl ether as an effective and robust alternative to p-methoxybenzyl as a protecting group for alcohols.
建立了在酸性条件下裂解4-(3,4-二甲氧基苯基)苄基(DMPBn)醚的可靠试剂体系。用TFA在无水CH 2 Cl 2和3,4-(亚甲二氧基)甲苯中作为阳离子清除剂处理DMPBn保护的单糖和假二糖,导致DMPBn醚的选择性裂解,从而以中等至高收率得到相应的脱保护产物。报道了显示烯丙基,苄基和对溴苄基醚,酯和糖苷键对这些反应条件稳定的实例。烯丙基,p的选择性裂解还证明了在含有DMPBn醚的受保护碳水化合物中的-溴苄基和PMB醚。这项工作建立4-(3,4-二甲氧基苯基)苄基醚作为有效和健壮的替代p甲氧基苄基作为醇的保护基。