A chemical probe for the estrogen receptor: Synthesis of the 3H-isotopomer of raloxifene
作者:Jeffrey A. Dodge、Mark G. Stocksdale、C. David Jones
DOI:10.1002/jlcr.2580360105
日期:1995.1
Radiolabelled raloxifene (LY156758) has been prepared by tritium gas hydrogenolysis of a 3-aroyl-bis-brominated precursor. The requisite halogenated intermediate was accessed by regioselective aroylation of benzothiophene 6 with the acid chloride of 3,5-dibromo-4-[2-(1-piperdinyl)ethoxy]benzoic acid (5). Selective deprotection of the aryl methyl ethers in the presence of the ethoxy side-chain followed by palladium catalyzed halogen-tritium exchange provided the target compound with a specific activity of 30.1 Ci/mmol.
放射性标记的雷洛昔芬(LY156758)是通过氚气氢解作用从3-芳酰基-双溴化前体制备的。所需的卤化中间体通过对苯并噻吩6进行区域选择性芳酰化,使用3,5-二溴-4-[2-(1-哌啶基)乙氧基]苯甲酸(5)的酸氯化物获得。随后在存在乙氧基侧链的条件下选择性去保护芳基甲基醚,经过钯催化的卤素-氚交换,获得了目标化合物,其特定活度为30.1 Ci/mmol。