@article{oai:toyama.repo.nii.ac.jp:00016834,
 author = {Nambu, Hisanori and onuki, yuta and Ono, Naoki and Yakura, Takayuki},
 issue = {15},
 journal = {Advanced Synthesis and Catalysis},
 month = {Jun},
 note = {application/pdf, The ring-opening cyclization of 2',3'-nonsubstituted and 2'-electron-withdrawing group (EWG)-substituted cyclohexane-1,3-dione-2-spirocyclopropanes was accomplished using iodide as a catalyst. The nonsubstituted derivatives afforded 3,5,6,7-tetrahydro-1-benzofuran-4(2H)-ones in high yields in the presence of trimethylsilyl iodide at room temperature. The EWG-substituted spirocyclopropanes, in turn, underwent regioselective ring opening followed by cyclization, which gave rise to 2-substituted tetrahydrobenzofuran-4-ones when a combination of tetrabutylammonium iodide catalyst and trifluoromethanesulfonic acid was used, whereas calcium iodide afforded the 3-substituted derivatives., Article},
 pages = {2938--2944},
 title = {Iodide-Catalyzed Ring-Opening Cyclization of Cyclohexane-1,3-dione-2-spirocyclopropanes},
 volume = {360},
 year = {2018}
}