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ChemInform Abstract: Regioselective Anionic [3 + 2] Cyclizations of Isoxazole, Pyrazole, and 1,2,4-Triazole Dinucleophiles — Efficient Synthesis of 2,4-Dihydroimidazo[4,5-b]quinoxalines, 3H-Imidazo[1,2-b]pyrazoles, and 5H-Imidazo[2,1-c][1,2,4]triazoles.

✍ Scribed by Peter Langer; Joerg Wuckelt; Manfred Doering; Peter R. Schreiner; Helmar Goerls

Publisher
John Wiley and Sons
Year
2010
Weight
34 KB
Volume
33
Category
Article
ISSN
0931-7597

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📜 SIMILAR VOLUMES

Regioselective Anionic [3+2] Cyclization
Regioselective Anionic [3+2] Cyclizations of Isoxazole, Pyrazole and 1,2,4-Triazole Dinucleophiles − Efficient Synthesis of 2,4-Dihydroimidazo[4,5-b]quinoxalines, 3H-Imidazo[1,2-b]pyrazoles and 5H-Imidazo[2,1-c][1,2,4]triazoles
✍ Peter Langer; Jörg Wuckelt; Manfred Döring; Peter R. Schreiner; Helmar Görls 📂 Article 📅 2001 🏛 John Wiley and Sons 🌐 English ⚖ 380 KB 👁 1 views

and 3-aminopyrazole and 3-amino-1,2,4-triazole provide convenient access to biologically relevant 3H-imidazo[1,2-b]pyrazoles and a 5H-imidazo[2,1-c][1,2,4]triazole.

One-pot synthesis of imidazo[1,2-b]pyraz
One-pot synthesis of imidazo[1,2-b]pyrazole, imidazo[1,2-b]-1,2,4-triazole, imidazo[1,2-a]pyridine, imidazo[1,2-a]pyrimidine, imidazo[1,2-a]benzimidazole, and 1,2,4-triazolo[4,3-a]benzimidazole derivatives
✍ Ahmad M. Farag; Kamal M. Dawood 📂 Article 📅 1997 🏛 John Wiley and Sons 🌐 English ⚖ 181 KB 👁 1 views

Hydrazonoyl bromides 1a-c react with 5-amino-3phenyl-1H-pyrazole, 5-amino-1H-1,2,4-triazole, 2aminopyridine, 2-aminopyrimidine, and 2-aminobenzimidazole to afford the corresponding imidazo[1,2-b]pyrazoles 10, imidazo[1,2-b]-1,2,4-triazoles 11, imidazo[1,2-a]pyridines 16, imidazo[1,2-a]pyrimidines 17