An enantioselective aerobic decarboxylative Povarov reaction of N-aryl α-amino acids with methylenephthalimidines through cooperative photoredox and chiralBrønstedacidcatalysis is reported. With a transition metal-free dual catalytic system including a chiral phosphoric acid and DPZ as a photosensitizer mediated by visible light, the transformations provided a series of valuable chiral isoindolin-1-ones
addition of radicals to activated olefins to directly forge stereocenters at their β-position. The stereoselective transformation was made possible by the introduction of cooperative nonclassical H-bonding interactions, thus enabling the chiral catalyst to provide sufficient stereocontrol.
Access to Isoxazolidines through Visible-Light-Induced Difunctionalization of Alkenes
作者:Hui Yang、Guo Wei、Zhiyong Jiang
DOI:10.1021/acscatal.9b03567
日期:2019.10.4
decarboxylation of N-aryl glycines are added to alkenes and the resulting radical intermediates are trapped by superoxides. The peroxides undergo swift intramolecular amine oxidation to provide the valuable isoxazolidines. Alkenes with varied functionalization can be applied. The isoxazolidine ring can be readily opened via reduction by zinc in acetic acid to afford γ-lactams in high yield.
LASER-DECOMPOSABLE RESIN COMPOSITION AND PATTERN-FORMING MATERIAL USING THE SAME
申请人:SUGASAKI Atsushi
公开号:US20080038663A1
公开(公告)日:2008-02-14
A laser-decomposable resin composition contains: a compound including at least one structure selected from a carboxyl group and a carboxylic acid anhydride structure and at least one hetero atom selected from N, S and O atoms other than the structure; and a binder polymer.
Access to Chromenopyrrolidines Enabled by Organophotocatalyzed [2 + 2 + 1] Annulation of Chromones with <i>N</i>-Arylglycines
作者:Xin Zhou、Biwei Zhang、Ping Wu、Wei Xu、Renqi Wang、Jingbai Li、Hongbin Zhai、Bin Cheng、Taimin Wang
DOI:10.1021/acs.orglett.3c02801
日期:2023.10.20
conditions via organophotocatalyzed aerobic decarboxylative [2 + 2 + 1] annulation of chromones with N-arylglycines, in which N-arylglycines perform dual roles (i.e., radical precursor and methylene provider). Mechanistic studies suggested that a Giese-type radical addition and consequent Mannich pathway were likely responsible for the annulation reaction.