Rhodium-Catalyzed Oxidative C–H Allylation of Benzamides with 1,3-Dienes by Allyl-to-Allyl 1,4-Rh(III) Migration
作者:Stamatis E. Korkis、David J. Burns、Hon Wai Lam
DOI:10.1021/jacs.6b06884
日期:2016.9.21
oxidative C-H allylation of N-acetylbenzamides with 1,3-dienes is described. The presence of allylic hydrogens cis to the less substituted alkene of the 1,3-diene is important for the success of these reactions. With the assistance of reactions using deuterated 1,3-dienes, a proposed mechanism is provided. The key step is postulated to be the first reported examples of allyl-to-allyl 1,4-Rh(III) migration
O(2), catalyzed by N-hydroxyphthalimide (NHPI) and Co(II) salt, leads undermildconditions to carbonyl derivatives (aldehydes, ketones, carboxylic acids, imides) whose distribution depends on the nature of the alkyl group and on the reaction conditions. Primary N-benzylamides lead to imides and aromatic aldehydes at room temperature without any appreciable amount of carboxylic acids, while under the
One-Carbon Oxidative Annulations of 1,3-Enynes by Catalytic C−H Functionalization and 1,4-Rhodium(III) Migration
作者:Johnathon D. Dooley、Hon Wai Lam
DOI:10.1002/chem.201706043
日期:2018.3.15
Rhodium(III)‐catalyzed C−H functionalization‐oxidativeannulations of aromatic substrates with 1,3‐enynes that contain allylic hydrogen atoms cis to the alkyne are described. The key step in these reactions is an alkenyl‐to‐allyl 1,4‐rhodium(III) migration to give electrophilic π‐allylrhodium(III) species. Nucleophilic trapping of these species gives heterocycles such as benzopyrans, isobenzofuranones
Synthesis of Unsymmetrical Aroyl Acyl Imides by Aminocarbonylation of Aryl Bromides
作者:Anita Schnyder、Adriano F. Indolese
DOI:10.1021/jo016076a
日期:2002.1.1
Aroyl imides were prepared by a palladium-catalyzed aminocarbonylation reaction of aryl bromides with carbon monoxide and primary amides in good yields (58-72%). The reactions were carried out under mild conditions (5 bar, 120 degreesC) using 1 mol % of a palladium phosphine complex. Several aryl bromides were reacted with formamide, acetamide, benzamide, and benzenesulfonamide, respectively. For activated aryl bromides, a phosphine-to-palladium ratio of 2:1 was sufficient, but less reactive aryl bromides required a ligand-to-palladium ratio of 6:1 in order to stabilize the catalyst and achieve full conversion. The imides were very sensitive to aqueous basic conditions and were easily converted to aroyl amides or benzoic acids.
NHPI-Mediated Electrochemical α-Oxygenation of Amides to Benzimides