KAl(SO4)2.12H2O (Alum) Reusable An Efficacious Heterogeneous Catalyst for the One-Pot Synthesis of Some New spiro[imidazo[1,2-a]pyridine-7,3'-indole]-2',5(1'H,6H)-dione Derivatives
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Abstract
A one-pot four-component condensation reaction of isatins, meldrum's acid, diamine, and nitro ketene dithioacetal in the presence of heterogeneous catalyst KAl(SO 4 ) 2 .12H 2 O (alum), which is relatively nontoxic, reusable very soluble in water, and inexpensive to yield a some new spiro[imidazo[1,2-a]pyridine-7,3'-indole]-2',5(1' H ,6 H )-dione derivatives is described.
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- europepmc
- last seen: 2026-05-19T01:45:01.086888+00:00
- unpaywall
- last seen: 2026-05-30T02:00:01.510937+00:00
License: CC-BY-4.0