作者:Geir Andresen、Aud Berglen Eriksen、Bjørn Dalhus、Lise-Lotte Gundersen、Frode Rise
DOI:10.1039/b101327k
日期:——
6-Substituted purin-2-ones have been prepared by completely regioselective addition of Grignard reagents to an N-protected purin-2-one followed by rearomatisation and deprotection. The target compounds may be regarded as analogues of the potent cytokinins trans-zeatin and benzylaminopurine (BAP), and most of the BAP analogues did induce increased weight growth in radish cotyledons. N-Protected (E)-6-styrylpurin-2-one underwent head to tail [2+2] dimerisation to the 1α,2α,3β,4β-substituted cyclobutane 15, when exposed to ordinary daylight. When irradiated with UV-light, the trans-compound isomerised to the corresponding cis-isomer. The structure of compound 15 was determined by single crystal X-ray diffraction methods at 150 K.
通过将格氏试剂完全区域选择性地加成到 N-保护的嘌呤-2-酮上,然后进行后气化和脱保护,制备出了 6-取代的嘌呤-2-酮。目标化合物可被视为强效细胞分裂素反式玉米素和苄基氨基嘌呤(BAP)的类似物,而且大多数 BAP 类似物都能诱导萝卜子叶重量增长。受 N 保护的 (E)-6-styrylpurin-2-one 在普通日光下会发生从头到尾的 [2+2] 二聚反应,生成 1α、2α、3β、4β 取代的环丁烷 15。在紫外线照射下,反式化合物异构化为相应的顺式异构体。化合物 15 的结构是在 150 K 温度下通过单晶 X 射线衍射方法确定的。