Enantio- and Diastereoselective Catalytic Alkylation Reactions with Aziridines
作者:Thomas A. Moss、David R. Fenwick、Darren J. Dixon
DOI:10.1021/ja8036965
日期:2008.8.1
The first asymmetric phase transfer catalyzed alkylation reaction of a range of carbon acids with N-sulfonyl aziridines is reported. When 10 mol % of a cinchona derived quaternary ammonium salt was employed as the catalyst under mildly basic conditions, N-o-(trifluoromethane)benzenesulfonyl aziridine was efficiently ring-opened to afford the amino ethylene products in consistently high yields and high
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.
Identification of 2-(4,5,6,7-tetrahydro-1H-pyrrolo[3,2-c]pyridin-3-yl)-ethylamine derivatives as novel GnRH receptor antagonists
作者:Mi Chen、Zhiqiang Guo、Marion C. Lanier、Liren Zhao、Stephen F. Betz、Charles Q. Huang、Colin J. Loweth、Neil J. Ashweek、Xin-Jun Liu、R. Scott Struthers、Margaret J. Bradbury、James W. Behan、Jenny Wen、Zhihong O’Brien、John Saunders、Yun-Fei Zhu
DOI:10.1016/j.bmcl.2007.05.009
日期:2007.7
A novel series of 2-(4,5,6,7-tetrahydro-1H-pyrrolo[3,2-c]pyridin-3-yl)-ethylamine derivatives were designed and synthesized as GnRH receptor antagonists. SAR studies led to a series of highly active molecules against both the rat and human receptors. Furthermore, one potent compound, 17j, demonstrated dose-dependent LH suppression in castrated rats. (C) 2007 Elsevier Ltd. All rights reserved.
Enantiospecific and regioselective opening of 2-alkyl nosylaziridines by indoles mediated by boron trifluoride. Application to a practical synthesis of a GnRH antagonist
作者:Roger N Farr、Ramon J Alabaster、John Y.L Chung、Bridgette Craig、John S Edwards、Andrew W Gibson、Guo-Jie Ho、Guy R Humphrey、Simon A Johnson、E.J.J Grabowski
DOI:10.1016/j.tetasy.2003.08.038
日期:2003.11
An efficient, high yield process for the synthesis of a GnRH antagonist has been developed. We have demonstrated that under boron trifluoride mediation, nosyl aziridines will react with 2-arylindole derivatives to afford β-substituted tryptamines in an enantiospecific process with remarkably high regioselectivity. The scope of the reaction was explored with several 2-substituted nosyl aziridines. The
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