Generation of Iminyl Copper Species from α-Azido Carbonyl Compounds and Their Catalytic C−C Bond Cleavage under an Oxygen Atmosphere
摘要:
A copper-catalyzed reaction of a-azidocarbonyl compounds under an oxygen atmosphere is reported where nitriles are formed via C C bond cleavage of a transient Iminyl copper intermediate. The transformation is carried out by a sequence of denitrogenative formation of iminyl copper species from alpha-azidocarbonyl compounds and their C C bond cleavage, where molecular oxygen (1 atm) is a prerequisite to achieve the catalytic process and one of the oxygen atoms of O-2 was found to be incorporated Into the beta-carbon fragment as a carboxylic acid.
An NAD(P)Hmodel was regenerated readily in situ by iron‐catalyzedreduction with molecular hydrogen. The subsequent biomimetic reduction of α‐keto‐/ α‐iminoesters proceeded smoothly in the presence of an iron‐based Lewis acid (LA) to provide α‐hydroxyesters and amino acid esters in good to excellent yields (see scheme; NAD(P)+=nicotinamide adenine dinucleotide (phosphate), TM=transitionmetal).
A copper-catalyzed reaction of a-azidocarbonyl compounds under an oxygen atmosphere is reported where nitriles are formed via C C bond cleavage of a transient Iminyl copper intermediate. The transformation is carried out by a sequence of denitrogenative formation of iminyl copper species from alpha-azidocarbonyl compounds and their C C bond cleavage, where molecular oxygen (1 atm) is a prerequisite to achieve the catalytic process and one of the oxygen atoms of O-2 was found to be incorporated Into the beta-carbon fragment as a carboxylic acid.