Iodine-Catalyzed Synthesis of N,N′-Chelate Organoboron Aminoquinolate
摘要:
We disclose a novel method for the synthesis of fluorescent N, N'-chelate organoboron compounds in high efficiency by treatment of aminoquinolates with NaBAr4/R'COOH in the presence of an iodine catalyst. These compounds display high air and thermal stability. A possible catalytic mechanism based on the results of control experiments has been proposed. Fluorescence quantum yield of 3b is up to 0.79 in dichloromethane.
Preparation of Triethylammonium Tetra-Arylborates (TEATABs): Coupling Partners for the Suzuki Reaction
摘要:
[image omitted] Six triethylammonium tetra-arylborates (TEATABs) were synthesized via a convenient reproducible procedure and characterized by spectroscopic methods (1H, 13C, 11B NMR and electrospray ionization-high-resolution mass spectrometry). The compounds could be stored at ambient temperature and were useful as reactants in the Suzuki reaction in aqueous conditions when using commercially available catalysts.
Sodium Tetraarylborates as Effective Nucleophiles in Rhodium/Diene-Catalyzed 1,4-Addition to β,β-Disubstituted α,β-Unsaturated Ketones: Catalytic Asymmetric Construction of Quaternary Carbon Stereocenters
A rhodium-catalyzed1,4-addition of sodium tetraarylborates to beta,beta-disubstituted alpha,beta-unsaturated ketones is described. Highly efficient asymmetric catalysis has also been achieved by employing a readily available chiral diene ligand, leading to the construction of quaternary carbon stereocenters with high enantioselectivity.
Rh‐oad: A rhodium/diene‐catalyzed addition of sodium tetraarylborates to alkyne‐tethered 2‐cycloalken‐1‐ones has been developed for the synthesis of spirocarbocycles. The tetraarylborates catalytically form two new carbon–carbon bonds. A chiral diene ligand also asymmetrically creates quaternary spirocarbon stereocenters with high enantiomeric purity.