Visible-Light-Induced sp3 C–H Functionalization of Alkyl Amines toward Tetrahydroquinoline Spiro[5.6] Compounds

An efficient and green methodology for the synthesis of tetrahydroquinoline spiro[5.6] compounds by visible-light-induced sp 3 C–H functionalization reactions of alkyl amines has been developed. The advantages of this protocol include inexpensive photocatalysts, high diastereoselectivity, transition-metal-free properties, and wide-scope substrates.