A Chiral Thioxanthone as an Organocatalyst for Enantioselective [2+2] Photocycloaddition Reactions Induced by Visible Light
作者:Rafael Alonso、Thorsten Bach
DOI:10.1002/anie.201310997
日期:2014.4.22
Thioxanthone 1, which was synthesized in a concise fashion from methyl thiosalicylate, exhibits a significant absorption in the visiblelight region. It allows for an efficient enantioselective catalysis of intramolecular [2+2] photocycloadditionreactions presumably by triplet energy transfer.
Enantioselective intramolecular [2 + 2] photocycloaddition using phosphoric acid as a chiral template
作者:Ryukichi Takagi、Chihiro Tabuchi
DOI:10.1039/d0ob02054k
日期:——
The enantioselective intramolecular [2 + 2] photocycloaddition of 4-bishomoally-2-quinolone (quinolinone) using phosphoric acid as a chiral template has been developed. Mechanistic studies using several NMR measurement techniques and density functional theory (DFT) calculations indicate that π–π interactions between the phenyl ring on phosphoric acid and quinolinone play important roles in the enantioselectivity