The lymphocyte function-associated antigen-1 (LFA-1) is an essential component in normal immune system function and is a target for drug discovery for its broad therapeutic potential in treating inflammatory diseases. Here, we report the synthesis of three potent antagonists of LFA-1 labeled with carbon-14 and deuterium to support drug metabolism and pharmacokinetics studies. Carbon-14 labeled (R)-1-acetyl-5-(4-bromobenzyl)-3-(3,5-dichlorophenyl)-5-methyl-imidazolidine-2,4-dione (1) was prepared in 27% radiochemical yield in two steps and with a specific activity of 2.1 GBq/mmol by using [14C]-phosgene. Carbon-14 labeled 5-bromopyrimidine was used to prepare (R)-5-(1-piperazinylsulfonyl)-1-(3,5-dichlorophenyl)-3-[4-(5-pyrimidinyl)benzyl]-3-methyl-1-H-imidazo[1,2a]imidazol-2-one (2) and (R)-1-[7-(3,5-dichlorophenyl)-5-methyl-6-oxo-5-(4-pyrimidin-5-yl-benzyl)-6,7-dihydro-5H-imidazo[1,2-a]imidazole-3-sulfonyl]piperidin-4-carboxylic acid amide (3) via a Suzuki reaction with the corresponding boronic acid esters in 42% and 67% radiochemical yield and specific activities of 1.85 GBq/mmol and 1.95 GBq/mmol, respectively. Deuterium labeled piperazine was reacted with the sulfonyl chloride derivative (7), followed by a Suzuki coupling to the pyrimidine boronic ester to give deuterium labeled (2) in 47% yield. Deuterium labeled isonipecotamide was reacted in a similar way with the sulfonyl chloride derivative (14) to furnish deuterium labeled (3) in one step and in 94% yield. Copyright © 2011 John Wiley & Sons, Ltd.
淋巴细胞功能相关抗原-1(LFA-1)是正常免疫系统功能的重要组成部分,因其在治疗炎症性疾病方面具有广泛的治疗潜力而成为药物研发的目标。在此,我们报告了三种用碳-14 和
氘标记的 LFA-1 强效拮抗剂的合成,以支持药物代谢和药代动力学研究。通过使用[14C]-
光气,我们分两步制备了碳-14标记的(R)-1-乙酰基-5-(4-
溴苄基)-3-(3,5-二
氯苯基)-5-甲基
咪唑烷-2,4-二酮(1),放射
化学收率为27%,比活度为2.1 GBq/mmol。碳-14 标记的 5-
溴嘧啶用于制备 (R)-5-(1-
哌嗪基磺酰基)-1-(3,5-二
氯苯基)-3-[4-(5-
嘧啶基)苄基]-3-甲基-1-H-
咪唑并[1、2a]imidazol-2-one (2) and (R)-1-[7-(3,5-dichlorophenyl)-5-methyl-6-oxo-5-(4-pyrimidin-5-yl-benzyl)-6,1-[7-(3,5-二
氯苯基)-5-甲基-6-氧代-5-(4-
嘧啶-5-基苄基)-6, 7-二氢-5H-
咪唑并[1,2-a]
咪唑-3-磺酰基]
哌啶-4-
羧酸酰胺(3)通过与相应的
硼酸酯发生铃木反应,放射
化学收率分别为 42% 和 67%,比活度分别为 1.85 GBq/mmol 和 1.95 GBq/mmol。
氘标记的
哌嗪与
磺酰氯衍
生物 (7) 反应,然后与
嘧啶硼酸酯进行铃木偶联,得到
氘标记的 (2),收率为 47%。
氘标记的异哌酰胺与
磺酰氯衍
生物 (14) 以类似的方式进行反应,一步即可得到
氘标记的 (3),收率为 94%。Copyright © 2011 John Wiley & Sons, Ltd. All Rights Reserved.