Synthesis 2003(8): 1267-1271
DOI: 10.1055/s-2003-39410
PAPER
© Georg Thieme Verlag Stuttgart ˙ New York

Zr(NO3)4: A Versatile Oxidizing Agent for Aromatization of Hantzsch 1,4-Dihydropyridines and 1,3,5-Trisubstituted Pyrazolines [1]

Gowravaram Sabitha*, G. S. K. Kumar Reddy, Ch. Srinivas Reddy, Narjis Fatima, J. S. Yadav
Organic Chemical Sciences, Indian Institute of Chemical Technology, Hyderabad-500 007, India
Fax: +91(40)27160512; e-Mail: sabitha@iict.ap.nic.in;
Further Information

Publication History

Received 20 February 2003
Publication Date:
26 May 2003 (online)

Abstract

An efficient oxidative aromatization of Hantzsch 1,4-dihydropyridines and 1,3,5-trisubstituted pyrazolines to the corresponding pyridines and pyrazoles has been reported using Zr(NO3)4 in acetic acid at ambient temperature. The reactions are very fast and the products were isolated in high yields and in pure form.

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IICT Communication No. 030205.

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IICT Communication No. 030205.