Synthesis of deuterium and15N-labelled 2,5-Bis[5-amidino-2-pyridyl]furan and 2,5-Bis[5-(methoxyamidino)-2-pyridyl]furan
作者:Mohamed A. Ismail、David W. Boykin
DOI:10.1002/jlcr.1111
日期:2006.10.15
The acetate salt of 2,5-bis[5-amidino-2-pyridyl]furan-d2/15N2 (4) was synthesized from 2,5-bis[5-cyano-2-pyridyl]furan-d2 (2), through the bis-O-acetoxyamidoxime followed by hydrogenation. Compound 2 was obtained via a Stille coupling reaction of 6-chloronicotinonitrile with 2,5-bis[tri-n-butyltin]-furan-d2 (1). 2,5-bis[5-amidino-2-pyridyl)furan-d6 (10) was synthesized from 2,5-bis[5-cyano-2-pyridyl)furan-d6 (9) via a direct reaction with lithium bis(trimethylsilyl)amide, followed by deprotection with ethanolic HCl. 15N and/or deuterium-labelled methoxy-amidines 5a-d2/15N2, 5b-d8, 12, 14-d6 were prepared in good yield via direct methylation of their respective diamidoximes with either dimethylsulfate-d0 or dimethylsulfate-d6 in DMF solution and using LiOH as a base. Copyright © 2006 John Wiley & Sons, Ltd.
2,5-双[5-脒基-2-吡啶基]呋喃-d2/15N2 的乙酸盐(4)是由 2,5-双[5-氰基-2-吡啶基]呋喃-d2(2)通过双-O-乙酰氧基脒肟加氢合成的。化合物 2 是通过 6-氯烟腈与 2,5-双[三正丁基锡]-呋喃-d2(1)的 Stille 偶联反应得到的。2,5-双[5-脒基-2-吡啶基]呋喃-d6 (10) 是由 2,5-双[5-氰基-2-吡啶基]呋喃-d6 (9) 与双(三甲基硅烷基)酰胺锂直接反应,然后用乙醇盐酸进行脱保护而合成的。在 DMF 溶液中,以 LiOH 为碱,用二甲基硫酸酯-d0 或二甲基硫酸酯-d6 直接甲基化各自的二脒肟,制备了 15N 和/或氘标记的甲氧基酰胺 5a-d2/15N2、5b-d8、12、14-d6,收率良好。Copyright © 2006 John Wiley & Sons, Ltd. All Rights Reserved.