90719-32-7Relevant articles and documents
Room Temperature Cu-Catalyzed N-Arylation of Oxazolidinones and Amides with (Hetero)Aryl Iodides
Bhunia, Subhajit,De, Subhadip,Ma, Dawei
supporting information, (2022/02/09)
N,N′-Bis(pyridin-2-ylmethyl)oxalamide (BPMO) was found to be an apposite promoter for the Cu-catalyzed N-arylation of oxazolidinones and primary and secondary amides with (hetero)aryl iodides at room temperature. Excellent chemoselectivity reached between
Atomically Dispersed High-Density Al–N4 Sites in Porous Carbon for Efficient Photodriven CO2 Cycloaddition
Yang, Qihao,Peng, Huaitao,Zhang, Qiuju,Qian, Xu,Chen, Xu,Tang, Xuan,Dai, Sheng,Zhao, Jiajun,Jiang, Kun,Yang, Qiu,Sun, Jian,Zhang, Linjuan,Zhang, Nian,Gao, Honglin,Lu, Zhiyi,Chen, Liang
, (2021/09/20)
Highly active catalysts that can directly utilize renewable energy (e.g., solar energy) are desirable for CO2 value-added processes. Herein, aiming at improving the efficiency of photodriven CO2 cycloaddition reactions, a catalyst composed of porous carbon nanosheets enriched with a high loading of atomically dispersed Al atoms (≈14.4?wt%, corresponding to an atomic percent of ≈7.3%) coordinated with N (AlN4 motif, Al–N–C catalyst) via a versatile molecule-confined pyrolysis strategy is reported. The performance of the Al–N–C catalyst for catalytic CO2 cycloaddition under light irradiation (≈95% conversion, reaction rate = 3.52 mmol g?1 h?1) is significantly superior to that obtained under a thermal environment (≈57% conversion, reaction rate = 2.11 mmol g?1 h?1). Besides the efficient photothermal conversion induced by the carbon matrix, both experimental and theoretical analysis reveal that light irradiation favors the photogenerated electron transfer from the semiconductive Al–N–C catalyst to the epoxide reactant, facilitating the formation of a ring-opened intermediate through the rate-limiting step. This study not only provides an advanced Al–N–C catalyst for photodriven CO2 cycloaddition, but also furnishes new insight for the rational design of superior photocatalysts for diverse heterogeneous catalytic reactions in the future.
Synthesis of pyrroloindolines through formal [3 + 2]-cycloaddition of indoles with chiral N-2-acetamidoacrylyl oxazolidinones
Smith, Isaac T.,Neeley, Jared B.,Brinley, Tanner D.,Fullmer, Peter R.,Andrus, Merritt B.
supporting information, (2020/05/01)
Chiral N-2-acetamidoacrylyl oxazolidinones were produced and reacted with indoles under Lewis acid conditions to generate hexahydropyrrolo[2,3-b]indole products in a formal [3 + 2] cycloaddition process. Optimal conditions included the use of tin(IV) chloride in methylene chloride at 0 °C. Pyrroloindoline products were obtained from various indoles with shorter reaction times (12 hr) up to 91% yield with high, >20:1 exo selectivity. A mechanism involving reversible conjugate addition followed by an enamine lone-pair-iminium capture, tautomerization, and tin-enolate protonation accounts for the selectivity. The method enables selective applications to pyrroloindoline targets and further refinement with chiral catalysts.