Synthesis and stability of a carbon-14-labeled 3-hydroxy-3-methylglutaryl coenzyme-A reductase inhibitor
作者:Richard C. Burrell、Samuel J. Bonacorsi、J. Kent Rinehart、Saleem Ahmad、Khehyong Ngu、Balu Balasubramanian
DOI:10.1002/jlcr.1810
日期:——
Inhibition of 3-hydroxy-3-methylglutaryl coenzyme-A reductase (HMGR) is an effective method of lowering plasma low-density lipoprotein cholesterol levels. Hemi-calcium (3R,5S,E)-7-(4-(4-fluorophenyl)-6-isopropyl-2-(methyl(1-methyl-1H-1,2,4-triazol-5-yl)amino)pyrimidin-5-yl)-3,5-dihydroxyhept-6-enoate (1) is a cholesterol-lowering statin drug that effectively inhibits HMGR. An important step in the development of this compound was the synthesis of a carbon-14-labeled analog for use in preclinical absorption, distribution, metabolism and excretion studies. The synthesis of a carbon-14-labeled analog of the cholesterol-lowering statin drug 1 is described. The carbon-14-labeled compound [14C]-1 was prepared in 11 steps from [14C]-labeled urea. The overall radiochemical yield for the synthesis was 22% and the radiochemical purity of [14C]-1 was 99.9% immediately after synthesis. It was found that [14C]-1 with a specific activity of 43.2 µCi/mg decomposed at a rate of about 1.9%/month when stored at −78°C under argon. Three samples of [14C]-1 were prepared to study the chemical stability of the molecule. One sample had a specific activity of 3.8 µCi/mg and the other two contained radical inhibitors, L-ascorbic acid (1% by weight, specific activity of 10.5 µCi/mg) or BHT (1% by weight, specific activity of 9.8 µCi/mg). For these samples the decomposition rates were decreased to 0.5%/month, 0.2%/month and 0.1%/month, respectively. Copyright © 2010 John Wiley & Sons, Ltd.
抑制3-羟基-3-甲基戊二酰辅酶-A还原酶(HMGR)是降低血浆低密度脂蛋白胆固醇水平的有效方法。半钙(3R,5S,E)-7-(4-(4-氟苯基)-6-异丙基-2-(甲基(1-甲基-1H-1,2,4-三唑-5-基)氨基) )pyrimidin-5-yl)-3,5-diHydroxyhept-6-enoate (1) 是一种降胆固醇他汀类药物,可有效抑制 HMGR。该化合物开发的一个重要步骤是合成碳 14 标记的类似物,用于临床前吸收、分布、代谢和排泄研究。 描述了降胆固醇他汀类药物 1 的碳 14 标记类似物的合成。碳14标记的化合物[14C]-1是由[14C]标记的尿素经过11个步骤制备而成。合成的总放射化学收率为22%,合成后[ 14 C]-1的放射化学纯度为99.9%。结果发现,比活度为43.2μCi/mg的[14C]-1在氩气下-78℃保存时,以大约1.9%/月的速率分解。制备了三个[14C]-1 样品来研究该分子的化学稳定性。一个样品的比活性为 3.8μCi/mg,另外两个样品含有自由基抑制剂 L-抗坏血酸(按重量计 1%,比活性为 10.5μCi/mg)或 BHT(按重量计 1%,比活性为 9.8μCi/mg) /毫克)。对于这些样品,分解率分别降至 0.5%/月、0.2%/月和 0.1%/月。版权所有 © 2010 约翰威利父子有限公司