摘要:
In order to develop a new asymmetric synthesis of enantiomerically pure 1-substituted tetrahydro-3-benzoazepines 3, the synthesis of diastereomerically pure oxazolo[3]benzoazepin one 4 has been performed. The stereochemical information of the key intermediate 4 originates from the chiral auxiliary (R)-phenylglycinol. The tricyclic ring system of 4 allows the stereoselective introduction of a benzyl residue at the 6-position to obtain benzyl derivative 15 with a diastereoselectivity of 95.1:4.9. The relative configuration of the main product 15 was determined by X-ray crystal structure analysis. Reductive degradation of diastereomerically pure 15 led to enantiomerically pure (R)-1-benzyl-3-benzoazepine 17. (c) 2005 Elsevier Ltd. All rights reserved.