The reaction of isatin 1 with benzaldehyde and a sec‐amine or the appropriate aldimine afforded the N‐Mannich bases 2–3 and the bis‐base 4. Treatment of 1 with glutaric dialdehyde and morpholine gave the bis‐base 5. Mannich reaction of the Schiff bases 6a–f derived from 1, led to the new Mannich bases and bis‐bases 7–9. The use of N‐methyl‐D‐glucamine as the amine component in the Mannich reaction with 6b–f led to the polyhydroxy Mannich bases 11–13.
Journal of Heterocyclic Chemistry – Wiley
Published: Jan 1, 2018
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