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- [25] A synthesis of chiral 1,1,3-trisubstituted 1,2,3,4-tetrahydro-β-carbolines by the Pictet-Spengler reaction of tryptophan and ketones:: Conversion of (1R,3S)-diastereomers into their (1S,3S)-counterparts by scission of the C(1)-N(2) bond CHEMICAL & PHARMACEUTICAL BULLETIN, 2003, 51 (12) : 1368 - 1373