Triethylamine → (2S,5R)-6-(benzyloxy)-7-oxo-N'-propanoyl-1,6-diazabicyclo[3.2.1]octane-2-carbohydrazide

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To a solution of the carboxylic acid of Example 9 or 16 (6b, 354 mg, 1.28 mmol) in tetrahydrofuran (10 mL) were added triethylamine (0.216 mL) and isobutyl chloroformate (208 μl) under ice-cooling, followed by agitating at 0° C. for 15 minutes. To the reaction solution were added a solution of propionohydrazide (161 mg, prepared following a procedure analogous to Reference Example 3 and Reference Example 6) in tetrahydrofuran (3 mL) at 0° C., followed by stirring at room temperature for 1 hour, and then concentrating under reduced pressure. The resulting residue was purified by silica gel column chromatography (hexane/ethyl acetate=1/1-0/1) to afford 425 mg of the title compound (yield 96%).

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