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 pinacolesters 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.