A mild and efficient approach to the 6H-oxazolo[3,2-f]pyrimidine-5,7-dione scaffold via unexpected rearrangement of 2,3-dihydropyrimido[6,1-b][1,5,3]dioxazepine-7,9(5H,8H)-diones: synthesis, crystallographic studies, and cytotoxic activity screening
We report a mild and efficient approach to the optically pure 6H-oxazolo[3,2-f]pyrimidine-5,7-dione scaffold via the unexpectedrearrangement and ring contraction of 2,3-dihydropyrimido[6,1-b][1,5,3]dioxazepine-7,9(5H,8H)-diones derived from nucleoside precursors. The developed procedure enables the synthesis of a wide range of compounds with great structural diversity. The structure of the obtained
我们报告了通过2,3-二氢嘧啶基[6,1 -b ]的意外重排和环收缩,对光学纯的6 H-恶唑啉[3,2 - f ]嘧啶-5,7-二酮支架进行了温和有效的处理[1,5,3] dioxazepine-7,9(5 H,8 H)-二酮衍生自核苷前体。所开发的方法能够合成具有极大结构多样性的多种化合物。通过NMR光谱和单晶X射线结构分析确认了所获得的化合物的结构。测试了最终产物对一种非癌性(成纤维细胞)和六种不同来源(结肠,神经胶质瘤,乳腺癌,子宫颈,外阴和肺)的癌细胞系的细胞毒性作用。合成的产物是具有类似铅的特性的低分子量化合物,适用于药物化学优化程序。
Preparation of C5-substituted O6,5′-cyclouridine
作者:Adam Mieczkowski、Pauline Peltier、Thomas Zevaco、Luigi A. Agrofoglio
DOI:10.1016/j.tet.2009.02.077
日期:2009.5
The synthesis of hitherto unknown C5-substituted O6,5′-cyclouridines is described. The 2′,3′-isopropylidene-uridine was treated with N-halogenosuccinimides forming appropriate bridged 5-halogeno derivatives. Using lithiation method, bromine substituent at C5 position was exchanged into various alkyl and alkenylderivatives.