A general two-stepsynthesis of substituted 3-aminoindazoles from 2-bromobenzonitriles involving a palladium-catalyzed arylation of benzophenone hydrazone followed by an acidic deprotection/cyclization sequence is described. This procedure offers a general and efficient alternative to the typical SNAr reaction of hydrazine with o-fluorobenzonitriles.
描述了由2-溴苯甲腈进行的一般两步合成取代的3-氨基吲唑,涉及钯催化的二苯甲酮的芳基化,然后进行酸性脱保护/环化序列。该方法为肼与邻氟苄腈的典型S N Ar反应提供了一种通用而有效的替代方法。