Solvent-mediated selective single and double ring-opening of N-tosyl-activated aziridines using benzylamine
作者:J.Erik W. Scheuermann、Gennadiy Ilyashenko、D.Vaughan Griffiths、Michael Watkinson
DOI:10.1016/s0957-4166(02)00102-7
日期:2002.3
An efficient methodology has been developed for the synthesis of a series of new diamine 2 and triamine ligands 3 for application in asymmetric catalysis via selective single or double ring-opening of tosylaziridines 1, which are derived from chiral pool amino acids. The selectivity of the ring-opening reaction is readily controlled by the solvent employed. Thus, in acetonitrile formation of secondary amines 2 occurs via a single ring-opening step. whilst in methanol the reactions proceed to give the tertiary amines 3 via the ring-opening of two aziridine molecules. (C) 2002 Elsevier Science Ltd. All rights reserved.
Chiral bicyclic guanidines: a concise and efficient aziridine-based synthesis
作者:Weiping Ye、Dasheng Leow、Serena Li Min Goh、Chin-Tong Tan、Chee-Hoe Chian、Choon-Hong Tan
DOI:10.1016/j.tetlet.2005.11.133
日期:2006.2
series of chiral bicyclicguanidines, either symmetrical or non-symmetrical, was synthesized using a concise and efficient aziridine-based synthetic methodology. Starting from commercial amino alcohols, five synthetic steps were performed, with only three requiring chromatographic purification, giving the desired guanidines in 43–71% overall yield. Preliminary studies using these guanidines showed moderate