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The synthesis of bis-α-99% 13C-enriched BW-1. Conditions were as follows. (a) Ethanol, reflux. (b) (Boc)2O, NaHCO3, CH2Cl2, H2O. (c) Raney Ni, NaOH, EtOH (50 lb/in2). (d) 2-Mesitylenesulfonyl chloride, 10% NaOH, CH2Cl2, H2O. (e) [2-(phenyl)]benzyl] chloride, NaH, dimethylformamide. (f) 30% HBr in acetic acid.
