The (3 + 2) cycloaddition/sulfur rearrangement reaction of donor–acceptor cyclopropanes bearing a single keto acceptor with indoline-2-thiones has been realized. Under the catalysis of Sn(OTf)2, a series of functionalized 3-indolyl-4,5-dihydrothiophenes were synthesized with moderate to excellent yields.
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Jiang et al. (2024) studied this question.
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