Wanfang Li

A self-adsorption color-changing device through interfacial charge transfer induced self-adsorption mechanism is proposed, which eliminates the applied power dependency of conventional electrochromic smart windows.

A photoinduced Pd-catalyzed denitrogenative cyclization of N-aroyl benzotriazoles was developed. Employing commercially available Pd₂(dba)₃/XantPhos as the catalyst and PhSiH₃ as the additive, a series of N-aroyl benzotriazole derivatives was efficiently converted to phenanthridinones under mild reaction conditions.

A palladium‐catalyzed acyl Suzuki–Miyaura coupling between carboxylic acids and organoboronic acids has been developed, employing hexafluorophosphate azabenzotriazole tetramethyl uronium as an in situ activator. Using Pd ₂ (dba) ₃ /PCy ₃ as the catalyst and K ₂ CO ₃ as the base, the reaction accommodates a broad range of both aliphatic and aromatic carboxylic acids. Controlled experiments and density functional theory calculations reveal that the pyridine nitrogen plays a critical role in the catalytic cycle.

A highly efficient 6-endo-trig radical cyclization reaction between cyclobutanone oximes and 1-isocyano-2-vinylbenzenes via visible light-induced photoredox catalysis has been realized in the presence of 2 mol % of fac-Ir(ppy)₃ as the photocatalyst, which gave rise to a variety of 2-(3-cyanoalkyl)substituted quinoline derivatives with moderate to excellent yields under mild reaction conditions.

A well-defined Pd catalyst had performed efficiently in Suzuki–Miyaura couplings of (het)aryl/alkyl N -acyl-glutarimides with (het)aryl/alkenyl boronic acids. Even at low Pd loadings, the reactions completed within 5 h.

A copper-catalyzed novel synthesis of symmetric diarylamines was achieved from aryl boronic acids and NaNO₂. This protocol employs aryl boronic acids as the commercially available arylation reagents and sodium nitrite (NaNO₂) as the cheap, stable, and solid amino source. Under a simple ligand- and base-free copper catalytic system (CuCl as the sole catalyst), a wide range of symmetric diarylamines could be obtained in moderate to good yields. Notably, the use of Na¹⁵NO₂ could produce ¹⁵N-labeled diarylamines, which would otherwise be difficult to prepare by the known methods.

We herein developed a mild and ligand‐free palladium‐catalyzed Heck‐Matsuda reaction between Morita‐Baylis‐Hillman alcohols (MBHAs) and aryl triazenes. After thorough screening of the acids, nitric acid (HNO₃) was unexpectedly found to be the most effective promoter for in situ generation of arenediazonium salts. This coupling reaction allows for a highly selective production of a various α‐arylmethyl β‐keto esters from readily accessible starting materials.

Transition-metal-catalyzed cross-coupling of arenes bearing two or more potential coupling sites is often challenging because of the chemoselectivity issue. If orthogonal cross-couplings were applicable, one can develop a synthetically useful approach for consecutive functionalization of the starting arenes compounds. We herein reported a Suzuki-Miyaura coupling of triazenyl-substituted aryl bromides catalyzed by PdCl2(PCy3)(2)/PPh3 under basic conditions. The resultant polyfunctionalized aryl triazenes could undergo Suzuki-Miyaura couplings under acidic conditions or be converted to many other functionalized arenes. This orthogonal coupling strategy allows for a sequential functionalization of arenes with same type of nucleophilic reagents toward the synthesis of diverse biaryls and teraryls.

We herein developed a base-promoted cyclization reaction between N-acyl benzotriazoles and p-toluenesulfonylmethyl isocyanide (TosMIC) to afford 4,5-disubstituted oxazoles. In the presence of 3 equiv of K3PO4, the two readily available starting materials reacted in N,N-dimethylformamide at 80 °C to give 28 examples of 4-tosyl-5-aryl, -alkyl, or -alkenyl-substituted oxazoles in moderate to high yields.