Simple primary β-amino alcohols act as an efficient organocatalysts in the asymmetricMichaeladdition of β-keto esters with nitroalkenes affording highly pure chiral Michael adducts. Also, both enantiomers of the adducts were obtained, depending on the specific catalyst used and reaction temperature.
One-pot synthesis of 2,4,6-triarylpyridines from β-nitrostyrenes, substituted salicylic aldehydes and ammonium acetate
作者:Xushun Qing、Ting Wang、Feixiang Zhang、Cunde Wang
DOI:10.1039/c6ra18630k
日期:——
A protocol for the synthesis of 2,4,6-trisubstitutedpyridines from the β-nitrostyrenes, available substituted salicylic aldehydes and ammonium acetate was developed. The present strategy features high chemoselectivity and excellent tolerance for a broad range of functional groups, in which the β-nitrostyrenes generated from aldehydes and nitromethane, substituted salicylic aldehydes and ammonium acetate
Improved Flavodoxin Inhibitors with Potential Therapeutic Effects against <i>Helicobacter pylori</i> Infection
作者:Juan J. Galano、Miriam Alías、Reyes Pérez、Adrian Velázquez-Campoy、Paul S. Hoffman、Javier Sancho
DOI:10.1021/jm400786q
日期:2013.8.8
Helicobacter pylori (Hp) infection affects one-half of the human population and produces a variety of diseases from peptic ulcer to cancer. Current eradication therapies achieve modest success rates (around 70%), resistance to the antibiotics of choice is on the rise, and vaccination has not proved to be successful yet. Using an essential Hp protein, flavodoxin, as target, we identified three low-molecular-weight flavodoxin inhibitors with bactericidal anti-Hp properties. To improve their therapeutic indexes, we have now identified and tested 123 related compounds. We have first tested similar compounds available. Then we have designed, synthesized, and tested novel variants for affinity to flavodoxin, MIC for Hp, cytotoxicity, and bactericidal effect. Some are novel bactericidal inhibitors with therapeutic indexes of 9, 38 and 12, significantly higher than those of their corresponding leads. Developing novel Hp-specific antibiotics will help fighting Hp resistance and may have the advantage of not generally perturbing the bacterial flora.