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Cascade cyclization reactions of S3˙-in situ generated from S2- with 1,3-enynes for the chemoselective synthesis of 2,3,5-trisubstituted thiophenes and 3-thienyl disulfides controlled by sulfide salts are developed. These two protocols provide new, environment-friendly and simple strategies to construct 2,3,5-trisubstituted thiophenes and 3-thienyl disulfides via the formation of two and six C-S bonds, respectively.
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Li et al. (2019) studied this question.
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