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2005
Organo-boron compounds
S 0040
Synthesis of Pinacol Esters of 1-Alkyl-1H-pyrazol-5-yl- and 1-Alkyl-1H-pyraAcids. — A convenient method for the synthesis of novel 1-alkylpyra20- 174 zol-4-ylboronic
zolboronic acids by regioselective lithiation of the pyrazole ring is reported. The acids
are unstable and easily decomposed in the presence of water. In order to prevent the
degradation process, they are converted into the corresponding pinacol esters. —
(IVACHTCHENKO*, A. V.; KRAVCHENKO, D. V.; ZHELUDEVA, V. I.; PERSHIN,
D. G.; J. Heterocycl. Chem. 41 (2004) 6, 931-939; Chem. Div. Labs, Inc., San Diego,
CA 92121, USA; Eng.) — Bartels
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