Ni-Catalyzed Direct Reductive Amidation via C–O Bond Cleavage
摘要:
A novel Ni-catalyzed reductive amidation of C(sp(2))-O and C(sp(3))-O electrophiles with isocyanates is described. This umpolung reaction allows for an unconventional preparation of benzamides using simple starting materials and easy-to-handle Ni catalysts.
Sunlight assisted direct amide formation via a charge-transfer complex
作者:Irit Cohen、Abhaya K. Mishra、Galit Parvari、Rachel Edrei、Mauricio Dantus、Yoav Eichen、Alex M. Szpilman
DOI:10.1039/c7cc05300b
日期:——
We report on the use of charge-transfercomplexes between amines and carbon tetrachloride, as novel way to activate the amine for photochemical reactions. This principle is demonstrated in a mild, transition metal free, visible light assisted, dealkylative amide formation from feedstock carboxylic acids and amines. The low absorption coefficient of the complex allows deep light penetration and thus
Highly Selective Palladium-Catalysed Aminocarbonylation of Aryl Iodides using a Bulky Diphosphine Ligand
作者:Verónica de la Fuente、Cyril Godard、Carmen Claver、Sergio Castillón
DOI:10.1002/adsc.201200114
日期:2012.7.9
the synthesis of amides via palladium‐catalysed aminocarbonylation of aryliodides is reported using the bulky cis‐1,2‐bis[(di‐tert‐butylphosphino)methyl]cyclohexane ligand under atmospheric pressure of carbon monoxide. Excellent conversions (up to 99%) and chemoselectivities (up to 99%) were obtained for a range of aryliodides and amine nucleophiles. The effect of the substituents on the substrate
Using hydrogen peroxide as a key oxidant, catalytic oxidativeamidation between aldehydes and amines was effectively carried out with PdCl2–xantophos as a catalyst in methanol under acidic conditions. The new protocol is mechanistically different from the previous one through β-hydride elimination.