Synthesis and Radiolabeling of (S)-4-Amino-5-iodo-2-methoxy-N-(1-azabicyclo(2.2.2)oct-3-yl)benzamide, the Active Enantiomer of (125I)Iodozacopride, and Re-evaluation of Its 5-HT3 Receptor Affinity.
作者:William A. HEWLETT、Tomas DE PAULIS、N. Scott MASON、Dennis E. SCHMIDT、Bakula L. TRIVEDI、Zhang-Jin ZHANG、Michael H. EBERT
DOI:10.1248/cpb.45.2079
日期:——
4-amino-2-methoxybenzoic acid via its corresponding 1-imidazole derivative. Radioiodination to produce (S)-[125I]iodozacopride was accomplished by treatment of deschloro-(S)-zacopride with 5 mCi sodium 125iodide and chloramine-T in hydrochloric acid. Purification of the reaction products using an HPLC system capable of detecting chlorinated side-products revealed a mixture of 2.1 mCi (1.3 nmol) (S)-[125I]iodozacopride
我们报告了未标记的(S)-碘杂扎必利的合成改进,通过脱氯-(S)-zacopride的放射性标记的(S)-[125I]碘杂扎必利,以及其对5-HT3受体亲和力的重新评估。由4-氨基水杨酸经其4-乙酰胺衍生物的碱水解,分七个步骤制备未标记的(S)-碘杂二十烷酸酯。(S)-碘杂铜甲酸酯的催化加氢得到脱氯-(S)-杂铜甲酸酯,与通过其相应的1-咪唑衍生物从(S)-3-氨基-喹核苷和4-氨基-2-甲氧基苯甲酸获得的脱氯-(S)-zacopride相同。通过用5 mCi 125碘化钠和氯胺-T在盐酸中处理脱氯-(S)-zacopride,完成放射性碘化反应生成(S)-[125I] iodozacopride。使用能够检测氯代副产物的HPLC系统纯化反应产物,发现混合物为2。1 mCi(1.3 nmol)(S)-[125I]碘杂扎克必利和(S)-zacopride(1.5 nmol)。纯化的(S)-[