Highly regioselective organocatalyzed synthesis of pyrazoles from diazoacetates and carbonyl compounds

…, J Huang, X Gong, J Wang

Index: Wang, Lei; Huang, Jiayao; Gong, Xiaojie; Wang, Jian Chemistry - A European Journal, 2013 , vol. 19, # 23 p. 7555 - 7560

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Abstract

Abstract A general, organocatalytic inverse-electron-demand [3+ 2] cycloaddition reaction between a range of carbonyl compounds and diazoacetates has been developed. This reaction is catalyzed by secondary amines as a “green promoter” to generate substituted pyrazoles with high levels of regioselectivity. It is noteworthy that this [3+ 2] cycloaddition reaction proceeds efficiently at room temperature with a simple and inexpensive catalyst. ...

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