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A mixture of 2′-oxo-1′-((2-(trimethylsilyl)ethoxy)methyl)-1′,2′-dihydro-3H-spiro[furo[2,3-b]pyridine-2,3′-pyrrolo[2,3-b]pyridine]-5-carboxylic acid, (described in Intermediate 5) (0.095 g, 0.23 mmol), (3S,5S,6R)-3-amino-6-methyl-5-phenyl-1-(2,2,2-trifluoroethyl)piperidin-2-one, (described in Intermediate 1) (0.098 g, 0.35 mmol), N,N-diisopropylethylamine (0.12 mL, 0.69 mmol), 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide hydrochloride (0.065 g, 0.35 mmol) and HOBT (0.015 g, 0.12 mmol) in DMF (3 mL) was stirred initially at 0° C. for 15 min, then gradually warmed to 23° C. and stirred for 3 h. The reaction mixture was partitioned between saturated aqueous sodium bicarbonate solution and ethyl acetate. The organic layer was dried over sodium sulfate, and concentrated. The residue was purified by flash chromatography on silica gel eluting with 50% ethyl acetate in petroleum ether to give the title compounds as a 1:1 mixture of isomers. MS: m/z=682.5 (M+1).

1. temperaturegradually warmed to 23° C.
2. stirringstirred for 3 h
3. customThe reaction mixture was partitioned between saturated aqueous sodium bicarbonate solution and ethyl acetate
4. dry with materialThe organic layer was dried over sodium sulfate
5. concentrationconcentrated
6. customThe residue was purified by flash chromatography on silica gel eluting with 50% ethyl acetate in petroleum ether