Formal [4 + 1] annulation of fluorinated sulfonium salt with cyclic unsaturated imines to access CF3-substituted pyrroles

Formal [4 + 1] annulation of easily available fluorinated sulfonium salt with cyclic unsaturated imines has been successfully developed. A structurally diverse set of CF₃-substituted dihydropyrroles was efficiently constructed in acceptable to excellent yields with excellent diastereoselectivities. The resulting CF₃-containing dihydropyrroles from this transition metal-free strategy could be easily transformed to pyrroles in good yields under basic conditions.

Synthesis of Fluoro-, Monofluoromethyl-, Difluoromethyl-, and Trifluoromethyl-Substituted Three-Membered Rings

This Minireview describes recent advances toward the synthesis of fluoro-, monofluoromethyl-, difluoromethyl-, and trifluoromethyl-substituted three-membered rings such as cyclopropanes, aziridines, epoxides, episulfides, cyclopropenes, and 2 H-azirines. The main synthetic methodologies since 2016 for cyclopropanes and since 2010 for the other three-membered rings are reported.

Stereoselective synthesis and applications of spirocyclic oxindoles

This review summaries recent synthetic developments towards spirocyclic oxindoles and applications as valuable medicinal and synthetic targets.

Iodine assisted synthesis of CF3 appended spirodihydrofuryl/cyclopropyl oxindoles by changing the active methylene sources

This paper describes the synthesis of two distinct types of CF₃-containing spirooxindoles by varying the active methylene sources. The reaction was carried out in DMSO, assisted by molecular iodine and Na₂CO₃via systematic application of Michael reaction and iodine mediated cyclisation. With 5-methyl-2,4-dihydro-3H-pyrazol-3-one as the methylene source, the final products obtained were spirodihydrofuropyrazolyl oxindoles, whereas 1H-indene-1,3(2H)-dione as the methylene source gave the final compounds spirocyclopropyl oxindoles. Modest to good yields were obtained for both the spiro systems.