Suzuki–Miyaura coupling of nonbenzylic α‐(acylamino)alkylboron compounds with aryl halides is established. A Pd/PCy2Ph catalyst promotes the reaction efficiently at 145 °C. The reaction of enantioenriched α‐(acylamino)alkylboron compounds affords chiral 1‐arylalkylamides in high enantiospecificity and inversion of configuration.
Exploiting the Bis-Nucleophilicity of α-Aminoboronates: Copper-Catalyzed, Intramolecular Aminoalkylations of Bromobenzoyl Chlorides
作者:Aaron M. Dumas、Adrian J. Sieradzki、Liam J. Donnelly
DOI:10.1021/acs.orglett.6b00586
日期:2016.4.15
containing adjacent nucleophilic centers. We have developed an acylation/arylation reaction using 2-bromobenzoyl chlorides as bis-electrophiles that harnesses the nucleophilicity of both positions, leading to isoindolinones. The reactions proceed under mild conditions via an intramolecular, Cu-catalyzed sp3–sp2 coupling, giving products in up to 95% yield. These conditions enable arylation of α,α-disubstituted
[EN] NEW SYNTHETIC ROUTE FOR THE PREPARATION OF ALPHA-AMINO BORONIC ESTERS<br/>[FR] NOUVELLE TECHNIQUE DE SYNTHÈSE POUR LA PRÉPARATION DE DÉRIVÉS D'ACIDE a-AMINOBORONIQUE PAR L'INTERMÉDIAIRE D'ALK-1-YNES SUBSTITUÉES