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Polymer-Supported Quenching Reagents for Parallel Purification

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journal contribution
posted on 28.05.1997 by R. John Booth, John C. Hodges
The preparation of polystyrene−divinylbenzene-supported derivatives of tris(2-aminoethyl)amine and methyl isocyanate are described. These polymeric reagents are used to quench excess reactants and remove known impurities from the crude reaction products obtained from the solution-phase, parallel syntheses of ureas, thioureas, sulfonamides, amides, and pyrazoles. In conjunction with the use of other polymeric reactants during the course of a reaction, the addition of polymer-supported quench reagent(s) at the conclusion of the reaction allows isolation of the desired product by a single filtration and evaporation of solvent. The mechanical simplicity and efficiency of this methodology make possible the rapid, parallel purification of crude reaction products obtained via solution-phase syntheses, regardless of whether the intended product is a single compound or a mixture of compounds, and hence offers an attractive alternative to solid-phase organic synthesis in the practice of combinatorial chemistry.