Solventless Protocol for Efficient Bis-<i>N</i>-Boc Protection of Adenosine, Cytidine, and Guanosine Derivatives
作者:Siddharth A. Sikchi、Philip G. Hultin
DOI:10.1021/jo060430t
日期:2006.8.1
A solvent-free reaction employing a simple low-energy ball mill apparatus converts the amino groups of adenosine, 2-deoxyadenosine, cytidine, 2-deoxycytidine, guanosine, and 2-deoxyguanosine as well as some of their ribosyl O-protected derivatives to the corresponding bis-N-Boc carbamates. In the case of guanosine compounds, the carbonyl group of the base moiety was also blocked as its O-Boc enol carbonate
使用简单的低能球磨仪进行的无溶剂反应将腺苷,2-脱氧腺苷,胞嘧啶核苷,2-脱氧胞苷,鸟苷和2-脱氧鸟苷的氨基以及它们的一些核糖基O保护的衍生物转化为相应的bis- N -Boc氨基甲酸酯。在鸟苷化合物的情况下,该碱基部分的羰基也被封闭为其O- Boc烯醇碳酸酯。使用瞬态原位O硅烷化的这种方法的一种变体允许制备bis- N-Boc核苷,其中糖羟基不受保护。除鸟苷化合物外,球磨反应迅速,方便且产率很高。这种高效的方法使用适合进一步合成操作的碱稳定且酸不稳定的基团保护这些核苷的氨基。