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Synthesis Of 3-Carboxylate Indazoles Via Ru(Ii)-Catalyzed Annulation Of Azobenzenes With Ethyl Glyoxalate

Xun Chen,Ying Wang,Shuojin Wang,Dulin Kong,Lijun Wen,Ruirui Zhai,Ke Zhao,Lili Bai,Youbin Li

CHINESE JOURNAL OF ORGANIC CHEMISTRY（2020）

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Abstract
The Ru(II)-catalyzed regioselective [4 +1] cycloaddition of azobenzenes with ethyl glyoxalate through C-H bond activation has been developed. This method provides a facile approach to various 3-carboxvlate indazoles in moderate to good yields. Meantime, the kinetic isotope effect was further investigated and the results indicated that the C-H bond-breaking was possibly not involved in the rate-limiting step of this transformation.
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Key words
Ru(II),C-H bond activation,cycloaddition,Indazoles
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