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The title compound, isothiocyanate 2, was obtained in good yield from the reaction of α‐chloromethylvinyl‐sulfone 1 with lead thiocyanate. The isothiocyanate 2 was reacted with aromatic amines to give 2‐amino‐5,6‐dihydro‐4H‐1,3‐thiazines 3 in good to moderate yields. The formation pathways are discussed.
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Yamamoto et al. (1992) studied this question.
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