Synthesis of Unnatural Amino Acids Functionalized with Sterically Shielded Pyrroline Nitroxides
作者:Ying Wang、Joseph T. Paletta、Kathleen Berg、Erin Reinhart、Suchada Rajca、Andrzej Rajca
DOI:10.1021/ol502449r
日期:2014.10.17
A series of unnatural amino acids functionalized with sterically shielded pyrroline nitroxides were synthesized. Their reduction by ascorbate/glutathione indicates that l-cysteine functionalized with gem-diethylpyrroline nitroxide is reduced at the slowest rate and is comparable to that measured for the most resistant to reduction pyrroline and pyrrolidine nitroxides.
[EN] FLUORINE-CONTAINING COMPOUND AND CONTRAST AGENT<br/>[FR] COMPOSÉ CONTENANT DU FLUOR ET AGENT DE CONTRASTE<br/>[JA] 含フッ素化合物および造影剤
Synthesis and Reduction Kinetics of Sterically Shielded Pyrrolidine Nitroxides
作者:Joseph T. Paletta、Maren Pink、Bridget Foley、Suchada Rajca、Andrzej Rajca
DOI:10.1021/ol302506f
日期:2012.10.19
A series of sterically shielded pyrrolidine nitroxides were synthesized, and their reduction by ascorbate (vitamin C) indicate that nitroxide 3, a tetraethyl derivative of 3-carboxy-PROXYL, is reduced at the slowest rate among known nitroxides, i.e., at a 60-fold slower rate than that for 3-carboxy-PROXYL.
Steric and Electronic Effects in Cyclic Alkoxyamines—Synthesis and Applications as Regulators for Controlled/Living Radical Polymerization
作者:Christian Wetter、Johannes Gierlich、Christoph Alexander Knoop、Christoph Müller、Tobias Schulte、Armido Studer
DOI:10.1002/chem.200305427
日期:2004.3.5
trimethylsilyl(TMS)-diazomethane. The use of the new alkoxyamines as regulators/initiators for radical polymerization is discussed. Efficient controlled and livingpolymerization of styrene and n-butyl acrylate was obtained with the six-membered tetraethyl alkoxyamine 13. Controlledpolymerizations can be conducted even at 90 degrees C. In addition, alkoxyamine 13 can be used for the preparation of AB diblock