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A practical and effective Z-selective synthesis of o-bromoacetophenone N-tosylhydrazones is developed. Subsequent cyclization of Z-tosylhydrazones to furnish 3-methylindazoles is accomplished with the aid of copper and DMEDA in aqueous ethanol. Cyclization reactions are complete at ambient temperature in 10min to afford the desired compounds in excellent yields.
This article has been retracted at the request of the Editor-in-Chief and Author. Please see Elsevier Policy on Article Withdrawal (http://www.elsevier.com/locate/withdrawalpolicy).Reason: Following helpful discussions with other research workers, the authors wish to withdraw the claims made in this paper.The solid material obtained by heating iron(III) chloride hexahydrate in pyridine is a mixture...
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