Sodium triacetoxyborohydride → 1-(benzo[d][1,3]dioxol-5-yl)-N-(2-tert-butyl-6-fluoro-1-((tetrahydro-2H-pyran-3-yl)methyl)indolin-5-yl)cyclopropanecarboxamide

Participants

Reaction Steps

To a solution of 1-(benzo[d][1,3]dioxol-5-yl)-N-(2-tert-butyl-6-fluoroindolin-5-yl)cyclopropane-carboxamide (150 mg, 0.38 mmol) in anhydrous dichloromethane (2.3 mL) at room temperature under N2 was added tetrahydropyran-3-carbaldehyde (54 mg, 0.47 mmol). After 20 min of stirring, NaBH(OAc)3 (110 mg, 0.51 mmol) was added in one portion at room temperature. The reaction mixture was stirred for 6 h at room temperature before being purified by column chromatography on silica gel (5-20% ethyl acetate/hexanes) to provide 1-(benzo[d][1,3]dioxol-5-yl)-N-(2-tert-butyl-6-fluoro-1-((tetrahydro-2H-pyran-3-yl)methyl)indolin-5-yl)cyclopropanecarboxamide (95 mg, 50%). CDCl3 was added to the indoline and the solution was allowed to stir overnight at ambient temperature. The solution was concentrated to give 1-(benzo[d][1,3]dioxol-5-yl)-N-(2-tert-butyl-6-fluoro-1-((tetrahydro-2H-pyran-3-yl)methyl)-1H-indol-5-yl)cyclopropanecarboxamide. MS (ESI) m/e (M+H+) 493.0.

Provenance & Evidence