Sn(OTf)₂-Catalyzed (3+2) Cycloaddition/Sulfur Rearrangement Reaction of Donor-Acceptor Cyclopropanes with Indoline-2-thiones

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.