Add time:08/07/2019 Source:sciencedirect.com
An alternate enantiospecific synthesis of methyl (S)-7-tert-butoxycarbonyl-2,3,4,5-tetrahydro-4-methyl-3-oxo-1H-1,4-benzodiazepine-2-acetate (5) is reported. The key step, which involves an intermolecular displacement of the activated aryl fluoride (9) by L-aspartic acid β-methyl ester, proceeds without racemization.
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