作者:Steve De Keczer、Howard Pames
DOI:10.1002/jlcr.2580360808
日期:1995.8
We describe herein, a novel synthesis of the previously unreported compound, 4,6-dibromo-2-pyridone (3) and its use in the preparation of [3H]-RS-91309, a potassium channel modulator. This key intermediate, (3), was reduced with carrier free tritium gas to furnish [4,6-3H]-2-pyridone (9) having a specific activity of 50 Ci/mmole. Condensation of (9) with epoxide (10), followed by elaboration of the resulting chromene methyl group of (12) gave [3H]-RS-91309 (14) whose specific activity was also 50 Ci/mmole. This chemistry, as well as the solution of several microscale related stoichiometry problems is discussed.
我们在此描述了一种新颖的合成方法,用于制备之前未报道的化合物4,6-二溴-2-吡啶酮(3),并将其用于制备钾通道调节剂[3H]-RS-91309。这个关键中间体(3)与无载体氚气还原,得到具有特定活性50 Ci/mmole的[4,6-3H]-2-吡啶酮(9)。将(9)与环氧化物(10)缩合,随后对所得的香豆素(12)中的甲基进行处理,最终得到了特定活性同样为50 Ci/mmole的[3H]-RS-91309(14)。本文讨论了这一化学反应以及若干微量相关化学计量问题的解决方法。