Structural study of (±) ethyl 3-acyloxy-1-azabicyclo[2.2.2]octane-3-carboxylates by 1H, 13C NMR spectroscopy, X-ray crystallography and DFT calculations
1 H, 13 C NMR spectroscopy and DFT/B3LYP calculations were applied to investigate the conformational preferences of the ethoxycarbonyl and acyloxy groups of some α-acyloxyesters derived from (±) ethyl 3-hydroxy-1-azabicyclo[2.2.2]octane-3-carboxylate. The crystal structure of (±) ethyl 3-diphenylacetoxy-1-azabicyclo[2.2.2]octane-3-carboxylate was determined by X-ray diffraction. To correlate between
A series of alpha-hydroxyesters derived from 3-hydroxy-1-azabicyclo[2.2.2]octane-3-carboxylic acid was synthesised and studied by IR and NMR spectroscopy. The combined use of H-1-H-1 COSY and H-1-C-13 correlation spectra of these compounds helped in the unambiguous assignments of the bicyclic carbon and proton resonances. The crystal structure of ethyl (+/-) 3-hydroxy-1-azabicyclo[2.2.2]octane-3-carboxylate was determined by X-ray diffraction. (C) 2002 Elsevier Science B.V. All rights reserved.
TRIGO, G. G.;MARTINEZ, M.;GALVEZ, E.;CABEZAS, R., J. HETEROCYCL. CHEM., 1981, 18, N 8, 1507-1511
作者:TRIGO, G. G.、MARTINEZ, M.、GALVEZ, E.、CABEZAS, R.