Enantioselective sulfa-Michael/aldol reaction of isoindigos has been successfully developed to afford bispirooxindole tetrahydrothiophenes with vicinal quaternary spirocenters.
An efficient and electro-organic synthetic approach to synthesize isatin (indole-2,3-dione) from 2-aminoacetophenone supported by I2–DMSO through C–N cross-coupling and C(sp2)–H/C(sp3)–H functionalization is reported in this communication.