A visible-light-driven
photoredox reaction of tetrahydroisoquinoline
with 2H-azirines is described. 4,7-Bis(4-methoxyphenyl)benzo[c][1,2,5]thiadiazole, a benzothiadiazole (BTD)
derived fluorophore, is used as an organic photoredox catalyst, and
the reaction offers an efficient access to 5,6-dihydroimidazo[2,1-a]isoquinolines with a broad range of functional groups.
The resulting 5,6-dihydroimidazo[2,1-a]isoquinolines present strong photoluminecence in solutions
and powders and could be applied in the fabrication of blue OLED devices.
A series of new fluorescent compounds were synthesized based on 2-(3,5-bis(trifluoromethyl)phenyl)-quinazoline, with alterable emission, high quantum yield, mechanochromic properties and can be applied as an optoelectronic material for blue OLED.
A photocatalysis
strategy for the regioselective synthesis of 3-functionalized
coumarins is reported. With visible light irradiation, a direct and
regioselective C(sp2)–C(sp3) coupling
reaction of 3-(2-hydroxyphenyl)acrylates with ethers or thioethers
occurs by using Ru(bpy)3Cl2·6H2O as a photocatalyst and TBHP as an oxidant. The cascade process
involves alkenylation of the C(sp3)–H bond of ethers
and lactonization, furnishing 3-alkylated coumarins as the final products.
This approach is characterized by a broad substrate scope, mild reaction
conditions, and simplified operation. The synthesis of 3-alkylated
coumarins could be realized by a one-pot procedure, starting from
commercially available salicylaldehyde.
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