Synthesis of the 3H-labelled 5-HT3 antagonist (RS-25259-197) at high specific activity
作者:Leyi Gong、Howard Parnes
DOI:10.1002/(sici)1099-1344(199605)38:5<425::aid-jlcr860>3.0.co;2-b
日期:1996.5
synthesized from 4-bromophenylacetic acid by Micheal addition, acid-induced ring cyclization, reduction and dehydration. Compound (5) was selected because it has two labelling sites to ensure high specific activity of the final product. Reduction of amide 6 with carrier-free tritium gas, followed by reduction of the amide functional group with BF 3 -OEt 2 and intramolecular cyclization furnished the title compound
描述了标题化合物、具有止吐特性的选择性 5-HT 3 拮抗剂的制备。涉及的关键中间体是 6-溴-1,2-二氢萘甲酸 (5),它是由 4-溴苯乙酸通过迈克尔加成、酸诱导环化、还原和脱水合成的。选择化合物 (5) 是因为它有两个标记位点以确保最终产品的高比活性。用无载体氚气还原酰胺 6,然后用 BF 3 -OEt 2 还原酰胺官能团并进行分子内环化,得到比活性为 70.4 Ci/mmol 和 >99% 纯度的标题化合物。