Thermal transformation of cyclopropylazoarenes into the five-membered nitrogen-containing heterocycles

RA Novikov, IP Klimenko, EV Shulishov…

Index: Novikov; Klimenko; Shulishov; Korolev; Tomilov Russian Chemical Bulletin, 2008 , vol. 57, # 8 p. 1718 - 1724

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Abstract

Abstract Cyclopropylazoarenes containing methoxy groups in the aromatic ring give the corresponding N-arylpyrazolines on the reflux in o-dichlorobenzene or on SnCl 2 catalysis at 80° C in good yields. The products can be smoothly oxidized into the corresponding pyrazoles. Thermolysis of cyclopropylazoarenes containing hydroxy groups in the aromatic ring proceeds more complicated. Thus in the case of resorcin azo derivative, strong ...

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