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Synthesis of the iminosugar pyrrole benzodiazepine alkaloids. Reaction conditions: D-lyxose/ribose tosylate (0.2 mmol, 1.0 equiv), 2-(1-pyrrolyl)benzylamine (1.2 equiv), TFA (0.2 equiv), CH3CN (2.0 mL), air, 60 °C, 4 h, oil bath heating; b isolated yields. c determined using 1H NMR; (dr): the dr was determined by 1H NMR of the mixture.
