Microwave-Assisted Ring-Opening of Activated Aziridines with Resin-Bound Amines
作者:François Crestey、Matthias Witt、Karla Frydenvang、Dan Stærk、Jerzy W. Jaroszewski、Henrik Franzyk
DOI:10.1021/jo702612u
日期:2008.5.1
nosylamide-activated aziridines under microwave irradiation conditions in solid-phasesynthesis (SPS). The effects of solvent, temperature, reaction time, and reagent ratio in SPS of partially protected triamines from aziridines and resin-bound diamines were investigated. The methodology was also optimized for the synthesis of novel amino acid derivatives.
Expedite Protocol for Construction of Chiral Regioselectively N-Protected Monosubstituted Piperazine, 1,4-Diazepane, and 1,4-Diazocane Building Blocks
作者:François Crestey、Matthias Witt、Jerzy W. Jaroszewski、Henrik Franzyk
DOI:10.1021/jo900441s
日期:2009.8.7
This paper describes the first study of solution-phase synthesis of chiral monosubstituted piperazine building blocks from nosylamide-activated aziridines. The protocol, involving aminolysis of the starting aziridines with omega-amino alcohols and subsequent Fukuyama-Mitsunobu cyclization, offers the advantage of mild conditions as well as short reaction times, and it leads to optically Pure N-Boc- or N-Ns-protected piperazines. This four-step sequence, requiring only a single final chromatographic purification, was extended to include novel diazepane and diazocane derivatives.
β3-Amino acids by nucleophilic ring-opening of N-nosyl aziridines
作者:Jaume Farràs、Xavier Ginesta、Peter W Sutton、Joan Taltavull、Frank Egeler、Pedro Romea、Fèlix Urpı́、Jaume Vilarrasa
DOI:10.1016/s0040-4020(01)00731-1
日期:2001.9
N-Nosyl aziridines can be easily prepared from1,2-aminoalcohols derived fromα-amino acids. Nucleophilic ring-opening of N-nosyl aziridines with cyanide ions followed by hydrolysis of the corresponding nitriles lead to N-nosyl β3-amino acids, which can be readily converted into a variety of derivatives bearing adequate functionality for peptide synthesis. The proposed methodology is simple, efficient