Aminocarbonylation (hydrazinocarbonylation) of iodoalkenes and iodoarenes

Selective Synthesis of Acyl-Sulfonyl Hydrazide Isomers: The Role of the Countercation of Base Selection in Palladium-Catalyzed Aminocarbonylations

Selective synthesis of isomeric N-acyl-N'-sulfonyl and N,N-acyl-sulfonyl hydrazides is achieved via palladium-catalyzed aminocarbonylation of aryl iodides with sulfonyl hydrazides under CO. The base's countercation, rather than its basicity, controls product isomerism. Conventional bases yield linear isomers, whereas sodium-based bases favor branched ones. This discovery broadens selective synthesis strategies, highlighting countercations as critical factors shaping product distributions and enabling refined selectivity in complex organic transformations.

Selective Synthesis of N-Acylnortropane Derivatives in Palladium-Catalysed Aminocarbonylation

The aminocarbonylation of various alkenyl and (hetero)aryl iodides was carried out using tropane-based amines of biological importance, such as 8-azabicyclo[3.2.1]octan-3-one (nortropinone) and 3α-hydroxy-8-azabicyclo[3.2.1]octane (nortropine) as N-nucleophile. Using iodoalkenes, the two nucleophiles were selectively converted to the corresponding amide in the presence of Pd(OAc)₂/2 PPh₃ catalysts. In the presence of several iodo(hetero)arenes, the application of the bidentate Xantphos was necessary to produce the target compounds selectively. The new carboxamides of varied structure, formed in palladium-catalyzed aminocarbonylation reactions, were isolated and fully characterized. In this way, a novel synthetic method has been developed for the producing of N-acylnortropane derivatives of biological importance.

Nickel-catalyzed reductive aminocarbonylation of vinyl triflates with nitro compounds for the synthesis of α,β-unsaturated amides

A nickel-catalyzed reductive aminocarbonylation reaction for the synthesis of α,β-unsaturated amides has been described.