作者:Robert Hudson、Joanne Moszynski
DOI:10.1055/s-2006-948176
日期:2006.11
Compact, fluorescent uracil aglycones and derivatives suitable for incorporation into the oligonucleotide mimic peptide nucleic acid (PNA) have been prepared by Sonogashira/Castro-Stephens coupling to monosubstituted phenylacetylenes. Cyclic 6-(phenyl)furo[2,3-d]pyrimidin-2(3H)-ones were accessed by the Ag+-catalyzed cyclization of the 5-alkynyluracil precursors. Although this reaction was sluggish, it gave quantitative chemical yields. Electron-rich alkynes, such as p-methoxyphenylethyne, cyclize much more rapidly than electron-deficient alkynes. Adjustment of the reaction conditions permitted the synthesis of p-nitrophenylfuranouracil in excellent yield.
已经通过Sonogashira/Castro-Stephens偶联到单取代苯乙炔上,制备了适用于掺入模拟寡核苷酸肽核酸(PNA)的无荧光尿嘧啶苷和衍生物。通过5-炔基尿嘧啶前体的Ag+催化环化,得到了环状6-(苯基)呋喃[2,3-d]嘧啶-2(3H)-酮。尽管这一反应较慢,但它提供了定量的化学产率。与电子贫乏的炔烃相比,如对甲氧基苯乙炔等电子丰富的炔烃环化速度更快。通过调整反应条件,可以以优异的产率合成对硝基苯基呋喃尿嘧啶。