A base-promoted cascade reaction for the regiospecificsynthesis of substituted 3-hydroxyisoindolinones under transition-metal-free conditions is developed. The base-mediated C–C bond coupling and N-α-sp3C–H bond hydroxylation are involved in this procedure, which features high regioselectivity, efficiency, and environmental friendliness. Various substituted 3-hydroxyisoindolinones, including some
Testing the limits of radical-anionic CH-amination: a 10-million-fold decrease in basicity opens a new path to hydroxyisoindolines<i>via</i>a mixed C–N/C–O-forming cascade
作者:Quintin Elliott、Gabriel dos Passos Gomes、Christopher J. Evoniuk、Igor V. Alabugin
DOI:10.1039/c9sc06511c
日期:——
An intramolecular C(sp3)–H amidation proceeds in the presence of t-BuOK, molecular oxygen, and DMF. This transformation is initiated by the deprotonation of an acidic N–H bond and selective radical activation of a benzylic C–H bond towards hydrogen atom transfer (HAT). Cyclization of this radical–anion intermediate en route to a two-centered/three-electron (2c,3e) C–N bond removes electron density