The nickel-catalyzed double carboxylation of internal alkynes employing carbondioxide (CO2) has been developed. The reactions proceed under CO2 (1 atm) at room temperature in the presence of a nickel catalyst, Zn powder as a reducing reagent, and MgBr2 as an indispensable additive. Various internal alkynes could be converted to the corresponding maleic anhydrides in good to high yields. DFT calculations
Palladium-Catalyzed Carbonylative Cyclization of β-Bromo-α,β-unsaturated Carboxylic Acids Leading to Maleic Anhydrides
作者:Chan Cho、Yeon Bae
DOI:10.1055/s-0033-1339309
日期:——
β-Bromo-α,β-unsaturatedcarboxylicacids are carbonylativelycyclized under carbon monoxide pressure in acetic acid in the presence of a catalytic amount of a palladium catalyst along with a base to give the corresponding maleic anhydrides in high yields.