[2 + 2] Annulation of Aldimines with Sulfonic Acids: A Novel One-Pot cis-Selective Route to β-Sultams

Base-Free SuFEx Reaction Promoted by Silica Gel for the Synthesis of β-Sultams

β-Sultams are recognized as potential antibacterial agents and crucial building blocks in chemical synthesis. Herein, a "SuFEx on silica gel" approach has been developed for one-step synthesis of β-sultams utilizing readily available amines and ethenesulfonyl fluoride (ESF). This process involves a sequential Michael addition of amines to ESF, followed by an intramolecular SuFEx reaction promoted by silica gel. Silica gel facilitates the activation of sulfonyl fluoride through hydrogen bonding between SVI-F and the surface hydroxyl groups on the silica gel and eliminates HF formed during the reaction. Notably, the use of a base, which is typically required in nearly all known SuFEx reactions, was rendered unnecessary. The β-sultam moiety was successfully incorporated into 26 tested primary amines, including pharmaceuticals and natural products, in high yields, showcasing the broad potential applications of this method.

Beyond a solvent: triple roles of dimethylformamide in organic chemistry

N,N-Dimethylformamide (DMF) is frequently used as an aprotic solvent in chemical transformations in laboratories of academia as well as in those of chemical industry. In the present review, we will reveal that DMF is actually something much more than a solvent. It is a unique chemical since, as well as being an effective polar aprotic solvent, it can play three other important roles in organic chemistry. It can be used as a reagent, a catalyst, and a stabilizer.

Bio-inspired unprecedented synthesis of reduced graphene oxide: a catalytic probe for electro-/chemical reduction of nitro groups in an aqueous medium

The first green reduction of graphene oxide (GO) using cashew leaf extract as a biorenewable catalyst containing water soluble tannins and gallic acid is reported herein. The synthesized rGO has been well characterized.

First graphene oxide promoted metal-free nitrene insertion into olefins in water: towards facile synthesis of activated aziridines

A facile metal-free graphene oxide (GO)-catalyzed synthesis of tosylaziridines using PhINTs as the nitrene source is reported.

A co-operative effect of visible light photo-catalysis and CoFe2O4 nanoparticles for green synthesis of furans in water

A novel approach to poly-functionalized furan synthesis is disclosed via oxidative decarboxylative [3+2] cycloaddition using co-operative catalysis by visible light and CoFe₂O₄ nanoparticles.