Journal
TETRAHEDRON-ASYMMETRY
Volume 12, Issue 23, Pages 3235-3240Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0957-4166(02)00004-6
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(+/-)-3-(2-Aminopropyl)-7-benzyloxyindole 1. assembled from 7-benzyloxyindole 3 in 59% overall yield, is resolved with O.O'-di-p-toluoyl L-(2R,3R)-tartaric acid 7 into (R)-1. a key intermediate of AJ-9677 2 (selective adrenaline beta(3)-agonist) in 99.5% e.e. and 36% overall yield. The unwanted enantiomer (S)-1 (61.9% e.e.: recovered in 57% yield from the crystallization filtrate) can be reused in another round of resolution after its enantiomeric purity is lowered to 3.7% by Raney Co treatment under a hydrogen atmosphere. (C) 2002 Elsevier Science Ltd. All rights reserved.
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