Electroreductive coupling of aromatic ketones, aldehydes, and aldimines with α,β-unsaturated esters: Synthesis of 5-aryl substituted γ-butyrolactones and lactams
作者:Naoki Kise、Yusuke Hamada、Toshihiko Sakurai
DOI:10.1016/j.tet.2017.01.013
日期:2017.2
The electroreductive intermolecular coupling of aromatic ketones and aldehydes with α,β-unsaturated esters in the presence of TMSCl gave the adducts as γ-trimethylsiloxy esters. The detrimethylsilylation of the adducts with TBAF afforded 5-aryl substituted γ-butyrolactones. The electroreductive coupling of N-(4-methoxyphenyl)-1-arylmethaneimines with methyl acrylate in the presence of TMSCl gave the
processes for their production are scarce and would greatly benefit from further investigations. Herein, we demonstrate that an iridium‐based photocatalyst promotes the direct reductive cross‐coupling of imines with olefins upon irradiation with visible light to give GABA derivatives in good yields and selectivities. We also stress the enabling triple role of tributylamine additive in this process
作者:Tong Zhang、Jaro Vanderghinste、Andrea Guidetti、Sabine Van Doorslaer、Giovanni Barcaro、Susanna Monti、Shoubhik Das
DOI:10.1002/anie.202212083
日期:2022.12.5
A novel visible-light-induced reaction for the reductive generation of synthetically important α-amino radicals proceeds via a π-π stacked ionic complex. Multiple π interactions stabilize the reactive intermediate, and neither a photocatalyst nor an initiator are required. This synthetic pathway enabled the synthesis of complex functionalized amines in high yield.
Regioselective Synthesis of γ-Amino Esters, Nitriles, Sulfones, and Pyrrolidinones by Nickel-Catalyzed Reductive Coupling of Aldimines and Activated Alkenes