An efficient synthesis of cycloalkane-1,3-dione-2-spirocyclopropanes from 1,3-cycloalkanediones using (1-aryl-2-bromoethyl)-dimethylsulfonium bromides: application to a one-pot synthesis of tetrahydroindol-4(5H)-one
Keywords: Cyclopropane; 1,3-Cyclohexanediones; Sulfonium salts; Indole; One-pot synthesis;