The reaction involves the addition of the sulfoximine to the alpha-carbonyl sulfoxonium ylide in the presence of the Ru catalyst. This addition leads to the formation of a new carbon-sulfur bond and triggers the cyclization process. As a result, a 1,2-benzothiazine ring is formed.
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Benzenesulfonamide, 4-methyl-N-3,4-pentadienyl-
