An improved synthesis of enantiopure 2-azabicyclo[2.2.1]heptane-3-carboxylic acid
摘要:
A facile multigram scale preparation of (1R.3S.4S)-2-azabicyclo[2.2.1]heptane-3-carboxylic acid via stereoselective synthesis of the corresponding alpha-amino ester hydrochloride is detailed. Hitherto applied protocols for the synthesis of this cyclic proline analogue involving a tedious chromatographic purification step could thus be considerably improved upon. The specific rotation of the alpha-amino acid reported in the literature has been revised. (C) 2002 Elsevier Science Ltd. All rights reserved.