NaY zeolite functionalized by sulfamic acid/Cu(OAc) 2 as a new and reusable heterogeneous hybrid catalyst for efficient solvent-free formylation of amines

Facile access to N-formyl imide as an N-formylating agent for the direct synthesis of N-formamides, benzimidazoles and quinazolinones

N-Formamide synthesis using N-formyl imide with primary and secondary amines with catalytic amounts of p-toluenesulfonic acid monohydrate (TsOH·H₂O) is described. This reaction is performed in water without the use of surfactants. Moreover, N-formyl imide is efficiently synthesized using acylamidines with TsOH·H₂O in water. In addition, N-formyl imide was successfully used as a carbonyl source in the synthesis of benzimidazole and quinazolinone derivatives. Notable features of N-formylation of amines by using N-formyl imide include operational simplicity, oxidant- and metal-free conditions, structurally diverse products, and easy applicability to gram-scale operation.

One-pot selective N-formylation of nitroarenes to formamides catalyzed by core–shell structured cobalt nanoparticles

A first heterogeneous non-noble cobalt catalyst for one-pot direct N-formylation of nitroarenes exhibiting high activity with a broad substrate scope under mild conditions is synthesised. It is easily separated with good recyclability.