Synthesis and deuterium labelling of the pure selective estrogen receptor modulator (SERM) acolbifene glucuronides
作者:Jean-Yves Sancéau、Denis Larouche、Brigitte Caron、Patrick Bélanger、Agnès Coquet、Alain Bélanger、Fernand Labrie、Sylvain Gauthier
DOI:10.1002/jlcr.1260
日期:2007.3.15
Acolbifene (EM-652·HCl, SCH 57068·HCl), a highly potent and orally active selective estrogen receptor modulator (SERM), is at late stage clinical development for the treatment of estrogen-sensitive breast cancer. Acolbifene-7-glucuronide 1 (major) and acolbifene-4′-glucuronide 2 (minor) were identified as metabolites of acolbifene in the human. The two monoglucuronides and a diglucuronide 3 as well as the corresponding 2H-labelled derivatives 4–6 were synthesised for use as preclinical and clinical standards for LC–MS/MS analysis. All glucuronides were prepared by the Schmidt glycosylation of monoprotected acolbifene with a glucuronyl imidate at −10°C to prevent epimerisation at the C-2 position. The two monoglucuronides 1 and 2 of acolbifene were separated by semi-preparative HPLC. Incorporation of three deuteriums was achieved by alkylation of chromanone 15 with C2H3MgI followed by dehydration with C2H3CO2 2H/2H2O. After chemical resolution and salt neutralisation, [2H3]acolbifene 19 was obtained with 99.4% enantiomeric purity and >98% isotopic purity. Copyright © 2007 John Wiley & Sons, Ltd.
阿考比芬(EM-652-HCl,SCH 57068-HCl)是一种高效口服活性选择性雌激素受体调节剂(SERM),目前正处于临床开发的后期阶段,用于治疗对雌激素敏感的乳腺癌。经鉴定,阿考比芬-7-葡萄糖醛酸苷 1(主要)和阿考比芬-4′-葡萄糖醛酸苷 2(次要)是阿考比芬在人体内的代谢产物。合成了两种单葡萄糖醛酸苷和一种二葡萄糖醛酸苷 3 以及相应的 2H 标记衍生物 4-6,用作 LC-MS/MS 分析的临床前和临床标准物质。所有葡萄糖醛酸苷都是在-10°C条件下,用葡萄糖醛酸酰亚胺对单保护的阿考比芬进行施密特糖基化反应制备的,以防止C-2位发生二聚反应。通过半制备高效液相色谱法分离出两种单葡糖醛酸苷 1 和 2。用 C2H3MgI 对色原酮 15 进行烷基化,然后用 C2H3CO2 2H/2H2O 脱水,实现了三个脱氘核的结合。经过化学分解和盐中和,得到了对映体纯度为 99.4% 和同位素纯度大于 98% 的 [2H3]acolbifene 19。Copyright © 2007 John Wiley & Sons, Ltd. All Rights Reserved.