的p被羟基和酰胺基团的-methoxybenzylation p甲氧基苄基氯利用的NaO吨-Bu在DMSO中描述。在DMSO中使用NaO t -Bu对位阻薄荷醇进行对甲氧基苄基化的过程比在THF或DMF中使用NaH对羟基和酰胺基进行对甲氧基苄基化的常用方法进行得更快。所描述的方法适用于室温下受阻的底物,而无需添加任何活化剂,例如四丁基碘化铵。
A mild method for the protection of alcohols using a para-methoxybenzylthio tetrazole (PMB-ST) under dual acid–base activation
作者:Santosh R. Kotturi、Jason S. Tan、Martin J. Lear
DOI:10.1016/j.tetlet.2009.07.020
日期:2009.9
With a view to expand the repertoire of chemoselective methods applicable to sensitive and multifunctional substrates, the p-methoxybenzylation of alcohols under essentially neutral conditions is reported. This was achieved by the silver triflate (AgOTf) activation of 5-(p-methoxybenzylthio)-1-phenyl-1H-tetrazole (PMB-ST) in the presence of 2,6-di-tert-butyl-4-methylpyridine (DTBMP). (c) 2009 Elsevier Ltd. All rights reserved.
Simple and rapid p-methoxybenzylation of hydroxy and amide groups at room temperature by NaOt-Bu and DMSO
faster than the commonly used methods which use NaH in THF or DMF for p-methoxybenzylation of hydroxy and amide groups. The described method was applicable for sterically hindered substrates at room temperature without adding any activating reagents such as tetrabutylammonium iodide.
的p被羟基和酰胺基团的-methoxybenzylation p甲氧基苄基氯利用的NaO吨-Bu在DMSO中描述。在DMSO中使用NaO t -Bu对位阻薄荷醇进行对甲氧基苄基化的过程比在THF或DMF中使用NaH对羟基和酰胺基进行对甲氧基苄基化的常用方法进行得更快。所描述的方法适用于室温下受阻的底物,而无需添加任何活化剂,例如四丁基碘化铵。