Photoenzymatic Hydrogenation of Heteroaromatic Olefins Using ‘Ene’‐Reductases with Photoredox Catalysts
作者:Yuji Nakano、Michael J. Black、Andrew J. Meichan、Braddock A. Sandoval、Megan M. Chung、Kyle F. Biegasiewicz、Tianyu Zhu、Todd K. Hyster
DOI:10.1002/anie.202003125
日期:2020.6.22
selective catalysts for the asymmetric reduction of activated alkenes. This function is, however, limited to enones, enoates, and nitroalkenes using the native hydride transfer mechanism. Here we demonstrate that EREDs can reduce vinyl pyridines when irradiated with visible light in the presence of a photoredoxcatalyst. Experimental evidence suggests the reaction proceeds via a radical mechanism where
This contribution details how a continuous flow reactor was used to react carbonyl compounds with Grignardreagents at room temperature in an efficient and safe manner. Flow rate, residence time and temperature were optimized for the preparation of a small collection of secondary and tertiary alcohols. Excellent yields and general applicability were observed using the set-up protocol. The procedure
Leveraging Electron‐Deficient Iminium Intermediates in a General Synthesis of Valuable Amines
作者:Che‐Sheng Hsu、Carlos R. Gonçalves、Veronica Tona、Amandine Pons、Marcel Kaiser、Nuno Maulide
DOI:10.1002/anie.202115435
日期:2022.5.9
The use of aminals as precursors for iminium ions has been limited to methylene derivatives, thus hampering its broader use. By employing electron-deficient iminium ions an obvious hurdle of the methodology is overcome, whilst generating highly desirable motifs. This broad concept is highlighted by the late-stage amination of quinine into a biologically interesting new analogue.
Photoinduced generation of phosphoranyl radicals offers a versatile strategy to access a variety of synthetically valuable radicals. A long-standing challenge remains in the regulation of phosphoranyl radical to undergo α-scission pathway, although the β-scission mode has been intensively studied. We herein developed an unprecedented protocol for selective α-scission of the P(OH)R3 radical intermediate
Amino alcohol-boron-binol complex and method for preparing optically active amino alcohol derivative by using same
申请人:MOLECULES & MATERIALS CO., LTD.
公开号:US11130734B2
公开(公告)日:2021-09-28
Disclosed are an amino alcohol-boron-binol complex as an intermediate, including Complex 3-1-1 shown below, and a method for preparing an optically active amino alcohol by using the same, wherein a racemic amino alcohol is resolved in an enationselective manner using a boron compound and a (R)- or (S)-binol, whereby an amino alcohol derivative with high optical purity can be prepared at high yield.