Reductive amidation of nitroarenes: a practical approach for the amidation of natural products
A simple and practical approach for the one-pot conversion of nitroarenes into amide derivatives has been developed. Zinc and acetic acid are utilized as a reducing agent, and acyl chloride and triethylamine are used as the acylating agent in DMF with good yield (~60%) of the amide. This method was applicable to manzamine A (1), where the yield of 6-cyclohexamidemanzamine A (7) was significantly improved (56%) by this approach relative to (17%) by beginning with the amine.
Wahba, Amir E.,Peng, Jiangnan,Hamann, Mark T.
supporting information; experimental part
p. 3901 - 3904
(2009/10/04)
Iron-catalyzed N-arylations of amides
A method was proposed for iron-catalyzed N-arylation of primary amides and its applicability to the synthesis of N-heterocycles by intramolecular ring closures. The method used a catalyst system of 10 mol % of FeCl3 and 20 mol % of N,N'-dimethylethylenediamine (DMEDA). The study found that secondary amides of N-methylbenzamide and N-benzylbenzamide produce N-arylated products in trace amounts. The method developed an iron-based catalyst system for efficient N-arylations of primary amides with aryl iodides. The study used a sealable tube equipped with a magnetic stir bar charged with amide, or K 3PO4, or K2CO3, or FeCl3. The study used NMR spectroscopic analysis to determine the identity and purity of the products. The method observed that different substituted aryl iodides made a positive impact on the reaction.
Correa, Arkaitz,Elmore, Simon,Bolm, Carsten
experimental part
p. 3527 - 3529
(2009/04/11)
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