A Novel Bis-Thiourea Organocatalyst for the Asymmetric Aza-Henry Reaction
作者:Constantinos Rampalakos、William D. Wulff
DOI:10.1002/adsc.200800214
日期:2008.8.4
A novelbis-thiourea BINAM-based catalyst for the asymmetricaza-Henryreaction has been developed. This catalyst promotes the reaction of N-Boc imines with nitroalkanes to afford beta-nitroamines with good yields and high enantioselectivities. This catalyst has the advantage that it can be prepared in a single step from commercially available materials. A model is proposed for the catalyst action
The influence of stereochemistry on anion binding and transport
作者:Louise E. Karagiannidis、Jennifer R. Hiscock、Philip A. Gale
DOI:10.1080/10610278.2013.806809
日期:2013.9.18
2-bisaminocyclohexane are shown to function as transmembrane anion antiporters. The results show that cis-receptors have a greater propensity for anion transport than analogous trans-receptors. Stability constants using 1H NMR techniques highlight the significance of stereoisomerism on anion binding in solution, as cis-receptors bind anions more strongly than trans-receptors.
Thiourea catalyzed organocatalytic enantioselective Michael addition of diphenyl phosphite to nitroalkenes
作者:Ana Alcaine、Eugenia Marqués-López、Pedro Merino、Tomás Tejero、Raquel P. Herrera
DOI:10.1039/c0ob01059f
日期:——
Bifunctional thiourea catalyzes the enantioselectiveMichaeladdition reaction of diphenyl phosphite to nitroalkenes. This methodology provides a facile access to enantiomerically enriched β-nitrophosphonates, precursors for the preparation of synthetically and biologically useful β-aminophosphonic acids. DFT level of computational calculations invoke the attack of the diphenyl phosphite to the nitroolefin