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The nucleophilic substitution at the S–S-bond of 2,2'-disulfanediyldianiline acting as an electrophile by β-keto esters, dimethyl malonate, and 1,3-diketones in the presence of triethylamine is followed by cyclization providing 4H-benzo[b][1,4]thiazine derivatives.

Nucleophilic substitution of 2,2′-disulfanediyldianiline by β-keto esters and 1,3-diketones in the presence of triethylamine