We present herein an unprecedented diastereoconvergent synthesis of vicinal diamines from diols through an economical, redox-neutral process. Under cooperative ruthenium and Lewis acid catalysis, readily available anilines and 1,2-diols (as a mixture of diastereomers) couple to forge two C−N bonds in an efficient and diastereoselective fashion. By identifying an effective chiral iridium/phosphoric
Application of coumarin dyes for organic photoredox catalysis
作者:Andrea Gualandi、Giacomo Rodeghiero、Emanuele Della Rocca、Francesco Bertoni、Marianna Marchini、Rossana Perciaccante、Thomas Paul Jansen、Paola Ceroni、Pier Giorgio Cozzi
DOI:10.1039/c8cc04048f
日期:——
Here we report the application of readily prepared and available coumarin dyes for photoredoxcatalysis, which are able to mimic powerful reductant [Ir(III)] complexes. Coumarin derivatives 9 and 10 were employed as photoreductants in pinacol coupling and in other reactions, in the presence of Et3N as a sacrificial reducing agent. As the electronic, photophysical, and steric properties of coumarins
Photocatalytic Barbier reaction – visible-light induced allylation and benzylation of aldehydes and ketones
作者:Anna Lucia Berger、Karsten Donabauer、Burkhard König
DOI:10.1039/c8sc02038h
日期:——
We report a photocatalytic version of the Barbier type reaction using readily available allyl or benzyl bromides and aromatic aldehydes or ketones as starting materials to generate allylic or benzylic alcohols. The reaction proceeds at room temperature under visible light irradiation with the organic dye 3,7-di(4-biphenyl)1-naphthalene-10-phenoxazine as a photocatalyst and DIPEA as sacrificial electron
Mechanochemistry‐Amended Barbier Reaction as an Expedient Alternative to Grignard Synthesis**
作者:Jagadeesh Varma Nallaparaju、Tatsiana Nikonovich、Tatsiana Jarg、Danylo Merzhyievskyi、Riina Aav、Dzmitry G. Kananovich
DOI:10.1002/anie.202305775
日期:2023.9.25
Use of mechanochemistry enabled the rapid in situ generation of Grignard reagents, thereby overcoming the longstanding limitations of the Magnesium-mediated Barbier reaction in solution.