Electrochemical 5-<i>exo-dig</i> aza-cyclization of 2-alkynylbenzamides toward 3-hydroxyisoindolinone derivatives
作者:Zhaojiang Shi、Nan Li、Wei-Zhen Wang、Hao-Kuan Lu、Yaofeng Yuan、Zhen Li、Ke-Yin Ye
DOI:10.1039/d2ob00637e
日期:——
Preparation of biologically relevant 3-hydroxyisoindolinones from readily available 2-alkynylbenzamides is an appealing synthetic approach. However, such kinds of compounds preferably undergo O-attacked 5-exo-dig/6-endo-dig cyclizations. Herein, we report an electrochemically generated amidyl radical proceeding via a highly selective N-attacked 5-exo-dig radical cyclization to form 3-hydroxyisoindolinone
Copper(II)/DBU Relay Catalyzed Annulation of α-Carbonyl-γ-alkynyl Sulfoxonium Ylides for Accessing <i>N</i>-Sulfonamido 2<i>H</i>-Isoindoles
作者:Peng Zhou、Wei-Tao Yang、Wen-Juan Hao、Bo Jiang
DOI:10.1021/acs.orglett.3c03479
日期:2023.12.1
A copper(II)/DBU relay catalyzed annulation of α-carbonyl-γ-alkynyl sulfoxonium ylides as a new class of sulfoxonium ylide reagents with sulfonyl hydrazides is reported, enabling intramolecular oxygen migration to produce a series of N-sulfonamido 2H-isoindoles with good yields. The present annulation proceeded readily by combining the Cu(II)-catalyzed 6-endo-dig oxo-cyclization with the DBU-catalyzed