tert-butyl 5'-(3-(3,5-dichlorophenyl)-4,4,4-trifluoro-3-(nitromethyl)butanoyl)-3'H-spiro[azetidine-3,1'-isobenzofuran]-1-carboxylate → tert-butyl 5'-(3-(3,5-dichlorophenyl)-3-(trifluoromethyl)-3,4-dihydro-2H-pyrrol-5-yl)-3'H-spiro[azetidine-3,1'-isobenzofuran]-1-carboxylate

Participants

Reaction Steps

The solution of tert-butyl 5′-(3-(3,5-dichlorophenyl)-4,4,4-trifluoro-3-(nitromethyl)butanoyl)-3′H-spiro[azetidine-3,1′-isobenzofuran]-1-carboxylate) (Preparation 11, 1.02 g, 1.74 mmol) in ethanol (12 mL) was purged with nitrogen gas for 30 minutes. To this reaction mixture was added pre washed Raney-Nickel (0.24 g 50% suspension in water). Resulting reaction mixture was stirred under hydrogen atmosphere using balloon for 16 hours at room temperature. After completion of starting material, the reaction mixture was filtered through celite bed and bed was washed with 10% MeOH in DCM (30 mL). Filtrate was concentrated under reduced pressure to get off white solid 1.2 g (crude). Crude compound was purified by column chromatography on silica gel (230-400 mesh). Desired compound was eluted in 10% EtOAc in n-Hexane to get off white semi solid (0.54 g, 57.45%). 1H NMR (400 MHz, CDCl3) δ: 1.53 (s, 9H), 3.45 (d, J=17.2 Hz, 1H), 3.76-3.81 (m, 1H), 4.10-4.14 (m, 2H), 4.32 (d, J=9.88 Hz, 2H), 4.43 (d, J=16.88 Hz, 1H), 4.85-4.90 (m, 1H), 5.13 (s, 2H), 7.25 (m, 2H), 7.36-7.37 (m, 1H), 7.54 (d, J=7.96 Hz, 1H), 7.73 (s, 1H), 7.83 (d, J=7.68 Hz, 1H), LC-MS (m/z): 540.6 (M+H)

Provenance & Evidence