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Updated: May 31, 2025

Preparation of N-2-alkoxyvinylsulfonamides from N-tosyl-1,2,3-triazoles and Subsequent Conversion to Substituted Phthalans and Phenethylamines
Published on: January 3, 2018
Benzo-Fused Phosphepines: Synthesis by Gold(I)-Catalyzed Intramolecular Hydroarylation and Ring Inversion
Akihiro Tsurusaki1, Marii Kishimoto1, Akihiro Komura1
1Department of Chemistry, Graduate School of Science, Osaka Metropolitan University, 3-3-138 Sugimoto, Sumiyoshi-ku, Osaka, 558-8585, Japan.
Gold(I) catalysis enables the synthesis of benzo-fused phosphepine oxides. Diastereomeric O-exo and O-endo adducts form, with their interconversion influenced by substituents and ring fusion.
Area of Science:
- Organometallic Chemistry
- Synthetic Organic Chemistry
- Stereochemistry
Background:
- Phosphine oxides are crucial in various chemical applications.
- Benzo-fused heterocyclic compounds offer unique structural motifs.
- Gold catalysis provides efficient routes for C-C bond formation.
Purpose of the Study:
- To explore Gold(I)-catalyzed intramolecular hydroarylation of dialkynyl(biaryl)phosphine oxides.
- To synthesize and characterize novel benzo-fused phosphepine oxides.
- To investigate the stereochemistry and isomerization of the resulting products.
Main Methods:
- Gold(I)-catalyzed intramolecular hydroarylation reaction.
- X-ray crystallographic analysis for structural determination.
- Theoretical calculations to estimate inversion barriers.
- Kinetic studies of thermal isomerization.
Main Results:
- Versatile synthesis of benzo-fused phosphepine oxides achieved.
- O-exo adducts were the major products, O-endo adducts the minor products.
- O-exo and O-endo adducts identified as diastereomers, interconverting via ring inversion.
- Inversion barriers significantly influenced by substituents and fused ring systems.
Conclusions:
- Gold(I) catalysis is effective for constructing complex phosphepine oxide frameworks.
- Stereochemical outcomes are governed by phosphorus and planar chirality.
- Understanding isomerization pathways is key for controlling product distribution.
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