Journal of the Chemical Society. Perkin transactions I p. 809 - 810 (1990)
Update date:2022-08-24
Topics:
Sanz, Dionisia
Claramunt, Rosa Ma.
Elguero, Jose
Salazar, Loreto
Espada, Modesta
Rearrangement of 1-aminopyrazole and 1-alkylaminopyrazoles into the corresponding 5-aminopyrazoles has been achieved in 48percent aqueous hydrobromic acid.The reaction, occurring through a ring opening-ring closure mechanism, constitutes a new and unambiguous procedure for the preparation of 1-substituted 5-aminopyrazoles.The products have been identified on the basis of 1H and 13C n.m.r. spectroscopic results and comparison with authentic samples.
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