2-Triazolylpyrimido[1,2,3-<i>cd</i>]purine-8,10-diones<i>via</i>1,3-dipolar cycloadditions to 2-ethynylpyrimido[1,2,3-<i>cd</i>]purine-8,10-dione
作者:Ondrej Simo、Alfonz Rybár、Juraj Alföldi
DOI:10.1002/jhet.5570370502
日期:2000.9
synthesis of a series of 5,6-dihydro-4H,8H-pyrimido[1,2,3-cd]purine-8,10(9H)-dione ring system derivatives with a [1,2,3]triazole ring bonded in position 2. The procedure is based on cycloaddition of substituted alkyl azides to the terminal triple bond of 5,6-dihydro-2-ethynyl-9-methyl-4H,8H-pyrimido[1,2,3-cd]purine-8,10(9H)-dione (4). This cycloaddition produced two regioisomers −5,6-dihydro-9-methyl
本文提出了一种串联5,6-二氢-4-氧代的合成ħ,8 ħ嘧啶并[1,2,3 CD〕嘌呤-8,10-(9 ħ与[1) -二酮环体系的衍生物, 2,3]在位置2结合的三唑环。该程序基于取代的叠氮化物与5,6-二氢-2-乙炔基-9-甲基-4 H,8 H-嘧啶基[1]的末端三键环加成反应,2,3 - cd ]嘌呤-8,10(9 H)-二酮(4)。该环加成反应产生了两个区域异构体-5,6-二氢-9-甲基-2-(1-取代的-1 H- [1,2,3]三唑-5-基)-4 H,8 H-嘧啶[1, 2,3- cd ]嘌呤-8,10(9H)-二酮(7)和2-(1-取代-1 H- [1,2,3]三唑-4-基)衍生物8。通过溴化从起始的2-未取代的化合物1获得所需的2-乙炔基衍生物4,得到2-溴衍生物2,其通过Sonogashira反应转化为三甲基甲硅烷基乙炔3,最后,通过水解除去保护性的三甲基甲硅烷基基团。