Synthesis of aryl α-keto-acids via the Cu-catalyzed conversion of aryl nitroaldol products
摘要:
Cu(II) salts efficiently catalyze the conversion of a variety of aryl nitroaldol products to afford the corresponding aryl alpha-keto-acids in high yields using 30% aq. AcOH:MeOH (1:1) as the solvent. (C) 2000 Elsevier Science Ltd. All rights reserved.
ionic liquid gel has been prepared by entrapping 1-butyl-3-methylimidazolium hydroxide ([Bmim]OH) in an aqueous agar gel. The ionic liquid gel has been characterized by Fourier transform infrared (FT-IR), Fourier transform Raman (FT-Raman) spectroscopy, scanning electron microscopy (SEM), thermogravimetric analysis (TGA) and energy dispersive X-ray analysis (EDX). The ionic liquid gel has been successfully
Production of (
<i>S</i>
)‐β‐Nitro Alcohols by Enantioselective C−C Bond Cleavage with an
<i>R</i>
‐Selective Hydroxynitrile Lyase
作者:D. H. Sreenivasa Rao、Santosh Kumar Padhi
DOI:10.1002/cbic.201800416
日期:2019.2
Cleavage is faster than synthesis: AtHNL‐catalysed stereoselective retro‐Henry cleavage of racemic β‐nitro alcohols produced the corresponding S enantiomers by kineticresolution with up to 99 % ee and 47 % conversion in 3–7 h. This approach widens the application of AtHNL for the synthesis both of (R)‐ and also of (S)‐β‐nitro alcohols from the appropriate substrates.
Useful Extensions of the Henry Reaction: Expeditious Routes to Nitroalkanes and Nitroalkenes in Aqueous Media
作者:Sosale Chandrasekhar、Annadka Shrinidhi
DOI:10.1080/00397911.2014.926373
日期:2014.10.18
Abstract The products of the Henry nitroaldol reaction from nitromethane and several aldehydes were reduced to the corresponding nitroalkanes with (n-Bu)3SnH in water under microwave irradiation (80 °C/10 min), or dehydrated to the corresponding nitroalkenes with K2CO3 in water (generally 0–5 °C/20 min). Both “one-pot” reactions occur in excellent yields across a range of aliphatic and aromatic (including
The synthesis and characterization of copper(I) complexes of the novel pyridine‐containing macrocyclic ligand (PC‐L) and their use as catalysts in the Henry reaction are reported. The pyridine‐based 12‐membered tetraaza macrocyclic (PC‐L) ligand 1 can be obtained in good overall yield (85%) from commercially available starting materials. The Cu(I) complexes showed good catalytic activities in the Henry