On the Virtue of Indium in Reduction Reactions. A Comparison of Reductions Mediated by Indium and Zinc: Is Indium Metal an Effective Catalyst for Zinc Induced Reductions?
Indium(0)‐mediated reductions have been reported for the transformation of several functional groups (imines, oximes, nitro groups, isoxazolidines, and conjugated alkenes, among others), prompted by the opportunity of performing the reactions in aqueous media and green conditions. We describe here the comparison of several reactions using indium or the less expensive zinc, carried out in order to evaluate
Cucurbit[7]uril as a catalytic nanoreactor for one-pot synthesis of isoxazolidines in water
作者:Davide Gentile、Giuseppe Floresta、Vincenzo Patamia、Angelo Nicosia、Placido G. Mineo、Antonio Rescifina
DOI:10.1039/c9ob02352f
日期:——
green chemistry guidelines. The aim of our work is to use the hydrophobic cavity of cucurbit[7]uril (CB[7]) to mimic nature for performing different dehydration and cycloaddition reactions in water. The hydrophobic cavity of CB[7] made it possible to synthesize nitrones and isoxazolidines in a one-pot fashion using water as a reaction solvent. Substituted isoxazolidines were obtained from the cycloaddition
Tricarbonyl(benzaldehyde)chromium(0) complexes in organic synthesis: A highly stereoselective 1,3-dipolar cycloaddition of chromium(0)-complexed nitrones
作者:Chisato Mukai、Jea Cho Won、Jong Kim In、Miyoji Hanaoka
DOI:10.1016/s0040-4039(00)97200-9
日期:1990.1
The 1,3-dipolar cycloaddition of chromium(0)-complexed nitrones (10, 11) with electron-rich olefins (2) provided, after decomplexation with CAN, -3,5-disubstituted isoxazolidines (-14, 15) in a highly stereoselective as well as regioselective manner.
Treatment of isoxazolidine derivatives with methyl iodide, followed by simple heating with aqueous NaOH, gives rise to a competitive formation of alpha,beta-enones and tetahydro-1,3-oxazines. The ring-opening process is controlled by the stereochemistry of H-5 which represents the driving factor of two competitive reaction routes.