Synthesis of pinacol esters of 1-alkyl-1<i>H</i>-pyrazol-5-yl- and 1-alkyl-1<i>H</i>-pyrazol-4-ylboronic acids
作者:Alexandre V. Ivachtchenko、Dmitry V. Kravchenko、Valentina I. Zheludeva、Dmitry G. Pershin
DOI:10.1002/jhet.5570410612
日期:2004.11
1-alkyl-1H-pyrazol-4-yl and 1-alkyl-1H-pyrazol-5-ylboronic acids and their pinacol esters were synthesized and characterized. The key step in the described methodology is the regioselective lithiation of the pyrazole ring. The synthesized pinacolates are stable under prolonged storage and can be used as convenient reagents in organic synthesis.
从1 H-吡唑开始,合成并表征了多种1-烷基-1 H-吡唑-4-基和1-烷基-1 H-吡唑-5-基硼酸及其频哪醇酯。所述方法中的关键步骤是吡唑环的区域选择性锂化。合成的松果酸酯在长期保存下是稳定的,可以用作有机合成中的方便试剂。