β-Bromo-α,β-unsaturated carboxylic acids are carbonylatively cyclized with 2,2-dimethylhydrazine under carbon monoxide pressure in THF in the presence of a catalytic amount of a palladium catalyst along with a base to give 1-(dimethylamino)-1H-pyrrole-2,5-diones.

2‐Bromobenzaldehydes are condensed and cyclized with arylhydrazines (or their hydrochlorides) in PEG‐400 at 110 °C in the presence of a catalytic amount of a copper(I) salt along with a base to give 1‐aryl‐1H‐indazoles in high yields. Copyright © 2013 John Wiley & Sons, Ltd.

β-Bromo-α,β-unsaturated carboxylic acids are carbonylatively cyclized 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.

Palladium-Catalyzed Carbonylative Cyclization of -Bromo-,-unsaturated Carboxylic Acids with 2,2-Dimethylhydrazine Leading to 1-(Dimethylamino)--1H-pyrrole-2,5-diones. -(BAE, Y. K.; CHO*, C. S.; Appl. Organomet. Chem. 28 (2014) 4, 225-229, http://dx.

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