A new synthesis of [1]benzopyrano[4,3-b]pyridin-5-ones 4 was developed starting from 3-formyl-coumarin N-functionalized amidines 3. The reaction is based likely on the intramolecular cyclocondensation of the C-α amidinic carbanion in basic medium on the formyl group.
New synthetic approach to [1]benzopyrano[4,3-b]pyridin-5-one derivatives / E.M. Beccalli, A. Contini, P. Trimarco. - In: TETRAHEDRON LETTERS. - ISSN 0040-4039. - 45:17(2004), pp. 3447-3449. [10.1016/j.tetlet.2004.03.009]
New synthetic approach to [1]benzopyrano[4,3-b]pyridin-5-one derivatives
E.M. BeccalliPrimo
;A. ContiniSecondo
;P. TrimarcoUltimo
2004
Abstract
A new synthesis of [1]benzopyrano[4,3-b]pyridin-5-ones 4 was developed starting from 3-formyl-coumarin N-functionalized amidines 3. The reaction is based likely on the intramolecular cyclocondensation of the C-α amidinic carbanion in basic medium on the formyl group.
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