Reaction of 1-chloro-4-(diethoxyphosphonyl)alka-2,3-dienes 14,15 with purine and pyrimidine heterocyclic bases in the presence of cesium carbonate afforded new acyclic analogues of nucleotides containing a 1,2-alkadienic skeleton 18–23. Dealkylation of 18–23 furnished phosphonic acids 2a–f. In contrast, alkylation reaction with 1-chloro-4-(diethoxyphosphonyl)octa-2,3-diene 16 led to Z- and E- 1,3-alkadienic phosphonates 25a,b and 26a,b. A similar reaction with 1-chloro-4-(diethoxyphosphonyl)-2-methylbuta-2,3-diene 17 led to the elimination of hydrochloride and formation of 4-(diethylphosphonyl)-2-methylbut-1-en-3-yne 24. Molecular structures of new acyclic nucleotides 18 and 2f are determined by X-ray crystallographic analysis.
在
碳酸铯存在下,1-
氯-4-(二乙氧基膦酰基)alka-2,3-二烯14、15与
嘌呤和
嘧啶杂环碱反应,合成了含有1,2-alkadienic骨架的新型非环核苷酸类似物18–23。去烷基化反应得到
膦酸2a–f。相反,1-
氯-4-(二乙氧基膦酰基)辛a-2,3-二烯16的烷基化反应导致了Z-和E-1,3-alkadienic
膦酸酯25a,b和26a,b的形成。类似的1-
氯-4-(二乙氧基膦酰基)-2-甲基丁a-2,3-二烯17反应导致
氯化氢消除和4-(
二乙基膦酰基)-
2-甲基丁-1-烯-3-炔24的形成。通过X射线晶体学分析确定了新型非环核苷酸18和2f的分子结构。