(2S)-2-((methoxycarbonyl)amino)-3-methylbutanoic acid → (R)-2-((1R,3S,4R)-3-(6-(9,9-difluoro-7-(2-((S)-1-((S)-2-(methoxy carbonylamino)-2-(tetrahydro-2H-pyran-4-yl)acetyl)pyrrolidin-2-yl)-1H-imidazol-5-yl)-9H-fluoren-2-yl)-1H-benzo[d]imidazol-2-yl)-2-azabicyclo[2.2.1]heptan-2-yl)-2-oxo-1-phenylethylcarbamic acid methyl ester

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The title compound was prepared according to the method employed to prepare (S)-benzyl 1-((S)-2-(methoxycarbonylamino)-3-methylbutanoyl)-4-oxopyrrolidine-2-carboxylate, except that methyl (R)-2-((1R,3S,4R)-3-(6-(9,9-difluoro-7-(2-((S)-pyrrolidin-2-yl)-1H-imidazol-5-yl)-9H-fluoren-2-yl)-1H-benzo[d]imidazol-2-yl)-2-azabicyclo[2.2.1]heptan-2-yl)-2-oxo-1-phenylethylcarbamate 3HCl salt and (S)-2-(methoxycarbonylamino)-2-(tetrahydro-2H-pyran-4-yl)acetic acid were used instead of (S)-benzyl 4-oxopyrrolidine-2-carboxylate hydrochloride and (S)-2-(methoxycarbonylamino)-3-methylbutanoic acid. MS (ESI) m/z 939.92 [M+H]+. (34 mg, 23%).

Provenance & Evidence