Abstract
Abstract Preparation of three stable α-dimethylhydrazonothioacetophenones containing an aromatic cycle substituted by strongly electron withdrawing groups (o-fluoro, o- or p-nitro) is described. By [4 + 2] cycloaddition, these compounds react with acrylic dienophiles (acrolein, methyrvinylketone, methyla-crylate, acrylonitrile) or with cyclic dienophiles (N-methyl or N-phenylmaleimide) to lead to 3,4-dihydro-2H-1,4-thiazines, 2H-1,4-thiazines or 4H-1,4-thiazines in good yields.
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