Synthesis of (13C)phenacetin and its application to the breath test for the diagnosis of liver disease.
作者:KATSUYUKI KURUMAYA、MASAHIRO KAJIWARA、TORU ABEI、SHUSUKE HIRANO、NOBUHIKO KOKUBUN
DOI:10.1248/cpb.36.2679
日期:——
N-(4-([1-13C]Ethoxy)phenyl)acetamide (13C-phenacetin) was prepared by two methods. In the first method, p-nitrophenol was alkylated with [1-13C]iodoethane and reduced to give 4-([1-13C]ethoxy)aniline (13C-p-phenetidine), which was acetylated with acetic anhydride to give 13C-phenacetin. In the second method, N-acetyl-p-aminophenol was alkylated with [1-13C]iodoethane. By using an excess amount of the starting material, [1-13C]iodoethane was convrted to 13C-phenacetin in high yield. The 13C-phenacetin thus obtained was applied to the breath test, and could be detected by 13CO2 analyzer. Thus, the 13C-phenacetin breath test should be applicable to the diagnosis of liver disease.
N-(4-([1-13C]乙氧基)苯基)乙酰胺(13C-苯乙腈)可通过两种方法制备。第一种方法是用[1-13C]碘乙烷烷基化对硝基苯酚,然后还原得到4-([1-13C]乙氧基)苯胺(13C-对苯乙腈),再用乙酸酐乙酰化得到13C-苯乙腈。第二种方法是用[1-13C]碘乙烷烷基化N-乙酰基对氨基苯酚。通过过量使用原料,[1-13C]碘乙烷可高产量转化为13C-苯乙腈。由此得到的13C-苯乙腈可用于呼气测试,且可通过13CO2分析仪检测。因此,13C-苯乙腈呼气测试可用于肝病的诊断。