Sodium Amalgam: A Highly Efficient Reagent for the Detosylation of Azathiacrown Ethers
作者:John W. Sibert、Philip B. Forshee
DOI:10.1055/s-2006-926338
日期:——
A simple, nearly quantitative method is demonstrated for the deprotection of tosylated mixed azathiacrown ethers using sodium amalgam. Four macrocycles, containing differing numbers of amino groups and ring sizes, were prepared using traditional cyclization procedures and the described deprotection technique. Three of the macrocycles, [12]aneNS3, [14]aneNS3, and [15]aneN2S3, were reported previously, though either in low yields, only in protected form, or using hazardous precursors, while the fourth, [18]aneN3S3, is a new ionophore.
本研究展示了一种使用汞齐钠对甲苯磺酰化混合氮杂冠醚进行脱保护的简单、近乎定量的方法。利用传统的环化程序和所述的脱保护技术制备了含有不同数量氨基和环尺寸的四个大环。其中三个大环,即 [12]aneNS3、[14]aneNS3 和 [15]aneN2S3 以前已有报道,但要么产率低,要么只是受保护的形式,要么使用了危险的前体。