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The title compounds (3a‐c) together with the benzothiazolines (4b‐c) were obtained by reaction between 2,2′ ‐dithiodianiline (1) and acetylenic ketone (2a) or esters (2b‐c). A possible pathway involving the formation and subsequent cyclization to 3 of enamine intermediates A and/or B, is suggested.
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Liso et al. (1980) studied this question.
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