2-Methoxyethylamine → 2-(2-Methoxy-ethylamino)-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 (107.1 mg, 0.3 mmol), 2-methoxyethylamine (91.3 mg, 1.2 mmol), palladium (II) acetate (3.4 mg, 5 mol %), 1,1′-bis(diphenylphosphino)ferrocene (16.6 mg, 10 mol %), and sodium tert-butoxide (57.7 mg, 0.6 mmol). The reagents were suspended in toluene (2 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 evaporated. After purifying the crude intermediate nitrile by flash chromatography, hydrolysis was performed by dissolving the residue in 25% dimethylsulfoxide/ethanol, adding 5 drops of 1 N sodium hydroxide and 5 drops of 30% aqueous hydrogen peroxide, followed by stirring at room temperature for 3 hours. The DMSO/ethanol mixture was then diluted with water and extracted with CH2Cl2 (3×). The combined organics were washed with brine (2×), dried over Na2SO4, and concentrated. The compound was purified by column chromatography (hexane/EtOAc) to yield the title compound (94.4 mg, 85% yield) of an off-white powder. LCMS m/z: (M+H) 370.2.

Provenance & Evidence