Copper-Catalyzed Cross-Dehydrogenative Coupling of α-Hydroxy Esters with Nitromethane
作者:Jin Jiang、Lili Xiao
DOI:10.1055/a-1539-9116
日期:2021.11
β-nitro-α-hydroxy esters were prepared via cross-dehydrogenative coupling reaction using α-hydroxy esters as hydroxy compounds and nitromethane as a nucleophile. The reaction is believed to undergo an oxidation of the hydroxygroup and then an addition of the generated carbonyl group. It is an example of CDC reactions related to hydroxy compounds via carbonyl intermediates.
NHC-coordinated cyclometalated palladium(II) catalyzed addition of arylboronic acids to methyl 2-hydroxy-2-methoxyacetate gave corresponding various functionalized methyl mandelate derivatives in good yields.
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.