Diastereo- and Enantioselective Hydrogenation of a Challenging Enamide Derived from 4-Phenyl-2-tetralone: An Appealing Shortcut Towards Enantiopure<i>cis</i>-2-Aminotetraline Derivatives
catalytic hydrogenation of the enamide N‐(4‐phenyl‐3,4‐dihydronaphthalen‐2‐yl)propionamide (2 a) using palladium on carbon is performed. This procedure provides the melatonin receptor ligand (±)‐cis‐4‐phenyl‐2‐propionamidotetralin (cis‐4‐P‐PDOT, 1 a) and its 8‐methoxy analog. Furthermore, Rh and Ru catalyzed homogeneous asymmetric hydrogenation of the challenging racemic endocyclic enamide 2 a with
Highly Specific Dual Enzyme-Mediated Payload Release from Peptide-Coated Silica Particles
作者:Paul D. Thornton、Andreas Heise
DOI:10.1021/ja9094439
日期:2010.2.17
Stimuli-responsive gate mechanisms offer potential for the controlled passage of payload molecules from a porous carrier vehicle on-demand We describe a method for the enzyme-mediated release of macromolecular guest molecules from inorganic silica particles coated with a bioactive peptide shell, synthesized precisely by Fmoc chemistry. Specific enzymatic hydrolysis of the peptide shell removes the bulky peptide-terminated Fmoc groups, permitting the selective release of previously entrapped guest molecules.