A Bifunctional Photoaminocatalyst for the Alkylation of Aldehydes: Design, Analysis, and Mechanistic Studies
作者:Thomas Rigotti、Antonio Casado-Sánchez、Silvia Cabrera、Raúl Pérez-Ruiz、Marta Liras、Víctor A. de la Peña O’Shea、José Alemán
DOI:10.1021/acscatal.8b01331
日期:2018.7.6
visible light conditions. To corroborate the experimental observations, ground state geometry optimization and energy transition studies of thioxanthone and bifunctional catalyst 4c were optimized by time-dependent density functional theory (TD DFT) calculations. The alkylation of aldehydes with this photoaminocatalyst works with high enantioselectivities and yields due to the stereoelectronic properties
The dawn of old stars: Classic xanthene dyes like eosin Y (gr. εoς=goddess of dawn) and green‐light irradiation can replace precious metal complexes for the organocatalytic asymmetric α‐alkylation of aldehydes, thus rendering the process purely organic.
Organocatalytic Enantioselective Alkylation of Aldehydes with [Fe(bpy)<sub>3</sub>]Br<sub>2</sub> Catalyst and Visible Light
作者:Andrea Gualandi、Marianna Marchini、Luca Mengozzi、Mirco Natali、Marco Lucarini、Paola Ceroni、Pier Giorgio Cozzi
DOI:10.1021/acscatal.5b01573
日期:2015.10.2
[Fe(bpy)3]Br2 complex in the presence of visiblelight and the MacMillan catalyst 3 (20 mol %) are highly effective in promoting an enantioselective organocatalytic photoredox alkylation of aldehydes with various α-bromo carbonyl compounds. Reaction yields of isolated compounds and enantioselectivities are very good and comparable to the ones obtained by [Ru(bpy)3]2+, organic dyes, or semiconductors, in
A fixed-bed photoreactor using conjugated nanoporous polymer-coated glass fibers for visible light-promoted continuous photoredox reactions
作者:Wei Huang、Beatriz Chiyin Ma、Di Wang、Zi Jun Wang、Run Li、Lei Wang、Katharina Landfester、Kai A. I. Zhang
DOI:10.1039/c6ta10768k
日期:——
Here, we report on a fixed-bed photoreactor containing conjugated nanoporous polymer-coated glass fibers for visible light-promoted, heterogeneous photoredox reactions in a continuous flow system.
visible light photoredox catalyst for the direct enantioselectiveα-alkylation of aldehydes in environmentally benign and simple conditions. Starting from a SOMO converse mechanism, the catalytic activity of the imidazolidinone organocatalyst was improved using an electrophilic cocatalyst. The resulting methodology and optimal conditions led to efficient and transition-metal-free direct photoredox organocatalysis