Synthesis, structural and conformational studies of Z- and E-isomers of fluorinated C-6 isobutenyl N-methyl thymine derivatives
作者:Svjetlana Krištafor、Andrijana Meščić、Mario Cetina、Silvija Korunda、Damjan Makuc、Janez Plavec、Silvana Raić-Malić
DOI:10.1016/j.jfluchem.2011.06.002
日期:2011.9
reaction of methoxytritylated pyrimidine derivative using diethylaminosulfur trifluoride (DAST). Conversion of one hydroxyl group to methoxytritylated, fluorinated, mesylated and acetylated pyrimidine derivatives (2, 3, 5–7 and 9) afforded a mixture of Z- and E-isomers in which Z-isomers were predominant. Conformational study of 1, and its fluorinated structural congeners 3 and 4 by the use of NOE experiments
一系列新的构象限制的嘧啶衍生物轴承C-6异丁烯基侧链的(2 - 9)已被制备。通过三氟甲乙三甲基化嘧啶衍生物的氟化反应,用二乙基氨基硫三氟化物(DAST)进行氟化反应,合成了新型氟代烯基嘧啶核苷模拟物3,作为正电子发射断层显像(PET)中示踪分子发展的模型化合物。一个羟基基团转化成methoxytritylated,氟化,甲磺酰化和乙酰化的嘧啶衍生物(2,3,5 - 7和9),得到的混合物ž -和Ë -异构体,其中Z-异构体占主导。通过使用NOE实验对1及其氟化结构同类物3和4进行的构象研究表明,化合物的主要构型,其中乙烯基H-1'质子在空间上接近N-1甲基和H-3'b亚甲基质子,并且在另一方面,H-3'a亚甲基质子接近C-5甲基质子。通过X射线晶体结构分析明确地确认了1,3-二羟基异丁烯基N-甲基胸腺嘧啶1的立体结构。