Iodine-catalyzed ketazines cyclization into 2-pyrazolines

BF Kukharev, VK Stankevich, VA Kukhareva

文献索引：Kukharev; Stankevich; Kukhareva Russian Journal of Organic Chemistry, 2008 , vol. 44, # 7 p. 1087 - 1088

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摘要

Ketazines are known to undergo cyclization into 2-pyrazolines under the action of protonic acids. Dicarboxylic acids are considered to be the most active catalysts for ketazines cyclization [1, 2]. The reaction is performed in the presence of an equimolar amount of the acid and often requires additional heating. The pyrazoline forms not in the form of a base but as a pyrazolinium salt of the corresponding acid, therefore the reaction mixture should be ...