Pyridazin-3(2H)-one systems have very useful biological properties and have found many applications within the pharmaceutical and agrochemical industries but, in general, synthesis of polysubstituted analogues can be very difficult to achieve. An approach to the syntheses of polyfunctional pyridazinone systems involving sequential nucleophilic substitution reactions of N-aryl and N-THP protected 4,5,6-trifluoropyridazin-3(2H)-ones as the core scaffolds is described. © 2009 Elsevier Ltd. All rights reserved.
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