Formal [3+3] Cyclocondensation of 4-Acyl-1H-pyrrole-2,3-diones with Five-Membered Cyclic Enamines To Form Substituted 1H-Py­razolo[3,4-b]pyridines and Isoxazolo[5,4-b]pyridines

Abstract

A highly efficient method for the preparation of multifunctional substituted 1H-pyrazolo[3,4-b]pyridines and isoxazolo[5,4-b]pyridines was developed through the formal [3+3] cascade cyclocondensation of 4-acyl-1H-pyrrole-2,3-diones as 1,3-bis-electrophiles with the five-membered cyclic enamines as 1,3-bis-nucleophiles.

Key words

fused-ring systems - nitrogen heterocycles - oxygen heterocycles - synthetic methods - cascade reactions

• References

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