Solvent-dependent behavior of arylvinylketones in HUSY-zeolite: a green alternative to liquid superacid medium

Synthesis of 3-Aryl-1-Indanones via CsF-Promoted Coupling of Arylboronic Acids with N-Tosylhydrazones

A series of 173-aryl-1-indanones, four of which are novel, were prepared in good yield via a CsF-promoted reductive cross-coupling of the monotosylhydrazone of a 1,3-indanedione with an arylboronic acid. The method demonstrates wide substrate scope and good functional group tolerance. Moreover, the 3-aryl-1-indanones could also be prepared on a multi-gram scale.

Cellulose sulfonic acid as a green, efficient, and reusable catalyst for Nazarov cyclization of unactivated dienones and pyrazoline synthesis

A high yielding and eco-friendly procedure for the preparation of cyclopentenoid and pyrazoline derivatives via cellulose sulfonic acid-mediated electrocyclization processes.

A mild, catalytic and efficient Nazarov cyclization mediated by phosphomolybdic acid

A mild, selective and efficient Nazarov cyclization of divinyl ketones catalyzed by phosphomolybdic acid (PMA) is described. The process demonstrates a broad substrate scope with functional group tolerance under short reaction times. PMA supported on silica gel is more efficient than the bulk catalyst and is recycled up to three times without significant activity loss.

Copper(I) zeolites as heterogeneous and ligand-free catalysts: [3+2] cycloaddition of azomethine imines

Copper(I)-exchanged zeolites were used as heterogeneous ligand-free catalysts for [3+2] cycloaddition of azomethine ylides, which allows versatile, efficient, and highly regioselective synthesis of pyrazolone derivatives. These cheap and easy-to-prepare catalysts exhibit wide scope and compatibility with functional groups. They are very simple to use, easy to remove (by simple filtration), and recyclable (up to six times without loss of activity).