Solvent-mediated selective single and double ring-opening of N-tosyl-activated aziridines using benzylamine
摘要:
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.