Abstract
Abstract Some 5-substituted pyrazoles and pyrimethamine were prepared from 3-methylthio-1-phenyl-4-phenylsulfonyl-2-buten-1-one (5a) or (E)-1-p-chlorophenyl-1-cyano-2-methylthio-3-phenylsulfonylpropene (6b) which could be easily synthesized from methyl phenyl sulfone.
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