Sodium cyanoborohydride → 2-[(4R,6S)-4-amino-6-(3,5-difluorophenyl)-3,3-dimethyl-2-oxopiperidin-1-yl]-N-[(2R)-2'-oxo-1,1',2',3-tetrahydrospiro[indene-2,3'-pyrrolo[2,3-b]pyridin]-5-yl]acetamide

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Reaction Steps

A mixture of 2-[(6S)-6-(3,5-difluorophenyl)-3,3-dimethyl-2,4-dioxopiperidin-1-yl]-N-[(2R)-2′-oxo-1,1′,2′,3-tetrahydrospiro[indene-2,3′-pyrrolo[2,3-b]pyridin]-5-yl]acetamide (380 mg, 0.698 mmol, described in Example 7) and NH4OAc (571 mg, 7.41 mmol) in CH3OH (2 mL) was stirred at ambient temperature for 20 min. NaCNBH3 (498 mg, 7.92 mmol) was added and stirring was continued at ambient temperature for 12 h. The reaction mixture was diluted with H2O (40 mL) and aqueous NaHCO3 (70 mL) and extracted with EtOAc (2×100 mL). The combined organic layers were dried over Na2SO4, filtered, and concentrated in vacuo. The crude product was purified by silica gel chromatography, eluting with a gradient of CH2Cl2:CH3OH-100:0 to 80:20, to give 2-[(4R,6S)-4-amino-6-(3,5-difluorophenyl)-3,3-dimethyl-2-oxopiperidin-1-yl]-N-[(2R)-2′-oxo-1,1′,2′,3-tetrahydrospiro[indene-2,3′-pyrrolo[2,3-b]pyridin]-5-yl]acetamide, which eluted first, and 2-[(4S,6S)-4-amino-6-(3,5-difluorophenyl)-3,3-dimethyl-2-oxopiperidin-1-yl]-N-[(2R)-2′-oxo-1,1′,2′,3-tetrahydrospiro[indene-2,3′-pyrrolo[2,3-b]pyridin]-5-yl]acetamide, which eluted second, the title compound. MS: m/z=546 (M+1). HRMS: m/z=546.2287; calculated m/z=546.2311 for C30H30F2N5O3.

Provenance & Evidence