Benzyl isobornyl amines: a simple and practical class of NMR discriminating agents for effective chiral recognition of acids
作者:Jayaraman Kannappan、Aditya N. Khanvilkar、Gourav M. Upadhyay、Ashutosh V. Bedekar
DOI:10.1016/j.tetasy.2017.08.007
日期:2017.10
The design and synthesis of a few simple N-benzyl derivatives of isobornyl amine is presented. The derivatives have been assessed as chiral solvating agents for effective discrimination of the signals of some acids in NMR analysis. The single crystal X-ray analysis of the salts of (R)-mandelic acid with two of the title derivatives help to understand the supramolecular interactions and assign the induced chemical shifts in H-1 NMR analysis. The title derivative is found to be suitable for quantitative determination of the enantiomeric excess of unknown enantiomeric purity as well as being efficient in resolving racemic mandelic acid. (C) 2017 Elsevier Ltd. All rights reserved.