4-Aminotetrahydropyran → 2-(Tetrahydro-pyran-4-ylamino)-4-(3,6,6-trimethyl-4-oxo-4,5,6,7-tetrahydro-indol-1-yl)-benzamide

Participants

Reaction Conditions

Reaction Steps

A “Personal Chemistry” microwave vial was charged with the title compound of Example 2 (2.858 g, 8.0 mmol), 4-aminotetrahydropyran (3.236 g, 32.0 mmol), palladium (II) acetate (89.8 mg, 5 mol %), 1,1′-bis(diphenylphosphino)ferrocene (443.6 mg, 10 mol %), and sodium tert-butoxide (1.538 g, 16.0 mmol). The reagents were suspended in toluene (40 mL) and were heated with microwave radiation to a temperature of 115° C. for fifteen minutes. After allowing the reaction vessel to cool, the suspension was filtered and the filtrate concentrated. After purifying the crude intermediate nitrile by flash chromatography, the nitrile was dissolved in 25% dimethylsulfoxide/ethanol, and 2 mL of 1 N sodium hydroxide and 2 mL of 30% aqueous hydrogen peroxide were added, followed by stirring at room temperature for 16 hours. The DMSO/ethanol mixture was then diluted with water and extracted with ethyl acetate (3×). The combined organics were washed with brine (2×), dried over Na2SO4, and evaporated. The residue was purified by column chromatography (EtOAc/MeOH) to yield 1.132 g (36%) of the title compound as an off-white powder. LCMS m/z: (M+H)=396.7.

Provenance & Evidence