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
Allylation of aldehydes and ketones with allyl bromide was performed with a catalytic amount of indium powder (from 0.01 to 0.1 equiv.) in THF in the presence of manganese and trimethylsilyl chloride as the reducing and oxophilic agent, respectively. (C) 1999 Elsevier Science Ltd. All rights reserved.
E-don-gruppierungen organishcer verbindungen als bevorzugte angriffs= stellen für nucleophile, alkylierende übergangsmetallreagenzien; eine erste übersicht
Allylic gallium reagents, prepared from gallium trichloride and the corresponding allylic Grignard reagents, allylated carbonyl compounds in good yields in an aqueous medium as well as in organic solvent.