Oxidation of 1-aminopyrazoles and synthesis of 1, 2, 3-triazines

A Ohsawa, H Arai, H Ohnishi, T Itoh…

Index: Ohsawa, Akio; Arai, Heihachiro; Ohnishi, Hidefumi; Itoh, Takashi; Kaihoh, Terumitsu; et al. Journal of Organic Chemistry, 1985 , vol. 50, # 26 p. 5520 - 5523

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Citation Number: 44

Abstract

R2 pyrazoles by oxidation. Unexpectedly, N-amination of pyrazoles 3 did not proceed by Rees and Storr's method4 using hydroxylamine-0-sulfonic acid or chloramine with which N- amination of indazoles has successfully carried out. However, the 1-aminopyrazoles were obtained in medium to high yields from appropriate pyrazoles through a deprotonation by sodium hydride followed by amination using (0-mesitylenesulfony1) hydroxylamine (MSH) ...