A Facile, Efficient and Selective Deprotection of P - Methoxy Benzyl Ethers Using Zinc (II) Trifluoromethanesulfonate
作者:Reddymasu Sireesha、Reddymasu Sreenivasulu、Choragudi Chandrasekhar、Mannam Subba Rao
DOI:10.2174/1570178616666190222151934
日期:2019.10.9
side reactions with sensitive functional groups as well as racemization or epimerization of stereo center because the protective groups are often cleaved at last stage in the synthesis. P - Methoxy benzyl (PMB) ether appears unique due to its easy introduction and removal than the other benzyl ether protecting groups. A facile, efficient and highly selective cleavage of P - methoxy benzyl ethers was
脱保护是显着的并且在温和的反应条件下进行,以限制与敏感官能团的任何更多副反应以及立体中心的消旋化或差向异构化,因为保护基团通常在合成的最后阶段被裂解。P-甲氧基苄基(PMB)醚由于与其他苄基醚保护基相比易于引入和除去而显得独特。据报道,通过在室温下在乙腈溶剂中使用20摩尔%的三氟甲磺酸锌(II),在15-120分钟内,可以轻松,高效且高度选择性地裂解P-甲氧基苄基醚。时间段。为了研究该方法的一般性,从具有不同保护基团的多种底物中制备了几种PMB醚,并使用乙腈中的Zn(OTf)2对PMB醚进行脱保护。