Direct synthesis of triphenylamine-based ordered mesoporous polymers for metal-free photocatalytic aerobic oxidation

Abstract

Visible-light active, heterogeneous, and metal-free photocatalysts reveal a more sustainable and environmentally friendly alternative to conventional metal-based photocatalysts. Highly ordered mesoporous polymers (OMPs) with tunable periodic structures, ordered and uniform...

Visible Light-Driven Flexible Synthesis of α-Alkylated Glycine Derivatives Catalyzed by Reusable Covalent Organic Frameworks

“…Possibly because of the reaction suspension’s suitable and effective light absorption in the blue LED emission region (Figures S22 and S23, see the Supporting Information), only β-ketoenamine-linked 2D-COF-4 gave the satisfactory desired product yield (entry 4). Then, several previously documented homogeneous or heterogeneous photocatalysts in visible light-driven α-C­(sp 3 )–H bond alkylation − or arylation − of glycine derivatives, such as Eosin Y, Ru­(bpy) 3 Cl 2 , and g-C 3 N 4 , were incorporated into the reaction system to evaluate their compatibility (Table S1, entries 1–3, see the Supporting Information). Regrettably, the results revealed that all these catalysts demonstrated relatively diminished catalytic activity.…”

Uranyl nitrate as a recyclable homogeneous photocatalyst for selective cross-coupling of N-substituted amines and indoles

“…Perhaps most importantly, this transformation is not limited to glycine derivatives. 26 For example, N -benzyl or N -alkyl substituted anilines were found to be suitable substrates. The reaction of unsubstituted indole 2a with N -benzyl-4-methoxyaniline ( 1q ) selectively afforded 3,3’-(phenylmethylene)bis(1 H -indole) ( 3q ), which acts as an antibiotic natural product named turbomycin B in 54% isolated yield.…”

Visible-light induced C(sp3)–H arylation of glycine derivatives by cerium catalysis

“…14 Inspired by this discovery, we assumed that whether these imine intermediates could be captured by other nucleophiles, such as electron-rich arenes, thus leading to the straightforward formation of α-arylglycines. With our continuous interests in the visible-light driven α-C(sp 3 )–H functionalization of glycine derivatives, 15,16 herein, we accordingly report a new Ce( iii )-catalyzed, visible-light induced aerobic oxidative dehydrogenative coupling reaction between glycine derivatives and electron-rich arenes for the efficient synthesis of α-arylglycines under mild conditions (Scheme 1b).…”