Synthesis of [8-14C]-2,6-dichloro-9H-purine, a radiolabelled precursor for 14C-nucleosides
作者:Jacob S. Valsborg、Lars J. S. Knutsen、Inge Lundt、Christian Foged
DOI:10.1002/jlcr.2580360509
日期:1995.5
The synthesis of [8- 14 C]-2,6-dichloro-9H-purine (2), a radiolabelled precursor for preparing 14 C-labelled nucleosides, is described. Triethyl [ 14 C]orthoformate was reacted with 4,5-diamino-2,6-dichloropyrimidine (1) in acetonitrile at 90 o C with methanesulfonic acid as catalyst to generate 2 in 84% radiochemical yield. Reaction of 2 with 1-O-acetyl-2,3,5-tri-O-benzoyl-D-ribofuranose produced
描述了 [8- 14 C]-2,6-二氯-9H-嘌呤 (2)(一种用于制备 14 C 标记核苷的放射性标记前体)的合成。[ 14 C] 原甲酸三乙酯与 4,5-二氨基-2,6-二氯嘧啶 (1) 在乙腈中在 90 o C 下与甲磺酸作为催化剂反应,以 84% 的放射化学产率生成 2。2 与 1-O-乙酰基-2,3,5-三-O-苯甲酰基-D-呋喃核糖反应生成[8- 14 C]-9-(2,3,5-三-O-苯甲酰基-β- D-呋喃核糖基)-2,6-二氯嘌呤 (3),产率为 86%。3的放射化学纯度高于98%,比活度为36 mCi/mmol。该方法普遍适用于药物开发中嘌呤的 14 C-标记