Development of a convenient route for the preparation of the N2-Cbz-protected guaninyl synthon required for Boc-mediated PNA synthesis
作者:Amelie Heuer-Jungemann、Nicola M. Howarth、Saudatu C. Ja’Afaru、Georgina M. Rosair
DOI:10.1016/j.tetlet.2013.09.034
日期:2013.11
An efficient, high yielding, chemo- and regioselective, five-step synthetic route to N2-Cbz-guanin-9-yl acetic acid has been developed, which avoids the use of triphosgene. After formation of the N2-Boc protected purine from 2-amino-6-chloropurine, two successive base-controlled alkylations allowed an N9-tert-butyl acetate function followed by an N2-Cbz moiety to be installed. The selectivities of
已经开发了一种高效,高产,化学和区域选择性的五步合成N 2 -Cbz-鸟嘌呤-9-基乙酸的合成路线,该路线避免了使用三光气。在形成后Ñ 2 -Boc由2-氨基-6-氯嘌呤保护嘌呤,两个连续的基控制烷基化允许一个Ñ 9 -叔丁基乙酸酯功能后跟Ñ 2 -Cbz部分进行安装。通过对6-(2-硝基苯氧基)类似物的X射线晶体学研究证实了这些反应的选择性。最后水解脱氯并去除Boc和叔叔同时在酸性条件下完成叔丁酯保护基团,以总产率53%得到鸟嘌呤-9-基PNA单体合成子。