Enzymatic halogenation of pyrazoles and pyridine derivatives

MCR Franssen, HG Van Boven…

Index: Franssen, M. C. R.; van Boven, H. G.; van der Plas, H. C. Journal of Heterocyclic Chemistry, 1987 , vol. 24, p. 1313 - 1316

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Citation Number: 21

Abstract

Abstract Pyrazole, 1-methylpyrazole and 3-methylpyrazole are chlorinated by the enzyme chloroperoxidase from Caldariomyces fumago, in the presence of potassium chloride and hydrogen peroxide at pH 2.7, yielding the corresponding 4-chloro derivatives in good yields. A 4H-pyrazole is proposed as an intermediate in this reaction. 2-Aminopyridine was converted regiospecifically by the same enzyme into 2-amino-3-chloropyridine, and 8- ...