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The reaction between 2‐aminothiophenol 1 and acetylenic nitriles or esters 2a‐d leads to the vinyl thio‐ethers 3a‐d. The conversion of 3 into benzothiazoles 8 and/or 1,4‐benzothiazines 9, in boiling dimethyl sulfoxide, has been achieved. A possible pathway involving benzothiazolines 5 as key intermediates is suggested.
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Liso et al. (1980) studied this question.
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