Tert-butyl 2-diazoacetate → tert-Butyl (1R,3S,4S,6R)-6-(2-tert-butoxy-2-oxoethoxy)-3-{[(2S)-2-cyano-1-pyrrolidinyl]carbonyl}-2-azabicyclo[2.2.1]heptane-2-carboxylate

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To a solution of tert-butyl (1R,3S,4S,6R)-3-{[(2S)-2-cyano-1-pyrrolidinyl]carbonyl}-6-hydroxy-2-azabicyclo[2.2.1]heptane-2-carboxylate obtained in Example 5-7 (322 mg) in dichloromethane (6 mL), were added rhodium acetate dimer (4.24 mg) and tert-butyl diazoacetate (0.27 mL). The mixture was stirred at room temperature for 4 hrs. The resulting mixture was evaporated in vacuo and the residue was chromatographed on silica gel eluting with ethyl acetate to give the target compound (236 mg).

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