Recent Advances in Synthetic Applications of Polyvinylpyrrolidone Supported Reagents and Catalysts

The use of solid-supported reagents and catalysts in solution-phase chemistry has emerged as a leading strategy that exploits the advantages of both solidand solution-phase synthesis. The approach essentially combines the benefits of product isolation and purification in solid-phase synthesis with the high-speed development and flexible choice of chemistry from the vast repertoire of solution phase organic reactions. The organic molecules synthesis using polymer-supported reagents and catalysts is highly attractive because the work-up involves only simple filtration and evaporation of the solvent [1]. Polyvinylpyrrolidone (PVP) is an amorphous polymer having broad applications in biomedical field due to its special properties such as low toxicity and good solubility in water and most organic solvents, good adhesion characteristics, and great physiological compatibility [2]. Also, PVP has good biocompatibility and has been applied for many years as a biomaterial or additive to drug compositions, e.g. as a blood plasma expander [3]. Polyvinylpolypyrrolidone (PVPP, crospovidone, or crospolividone) is a highly cross-linked polyvinylpyrrolidone (PVP). The crosslinked form of polyvinylpyrrolidone is insoluble in water, though it still absorbs water and swells very rapidly generating a swelling force. This property makes PVPP useful as a disintegrant in pharmaceutical tablets [2]. Polyvinylpyrrolidone shows a strong binding affinity to small molecules. Furthermore, its iodine complex, povidon-iodine, is widely used as an anti-infective agent in clinical treatments [4].