Potassium Carbonate → HCID 86709188, compound

Participants

Reaction Conditions

Reaction Steps

An oven-dried 20 mL microwave vial was charged with 3-amino-2-methylpentan-2-ol (Example 34A) (0.0705 g, 0.602 mmol), 4-fluoro-3-((trimethylsilyl)ethynyl)phthalonitrile (Example 40C) (0.146 g, 0.602 mmol), and K2CO3 (0.100 g, 0.722 mmol). Anhyd NMP (3 mL) was added via syringe and the vial was sealed with a PTFE-faced crimp top. The mixture was subjected to microwave heating (140° C.) for 35 min. The mixture was cooled, poured into satd NaHCO3, layered with EtOAc and the whole was filtered (Whatman #2). Layers were separated and the aqueous layer was extracted with EtOAc (×2). Combined organics were washed (water, brine), dried over Na2SO4 and concentrated in vacuo. The residue was purified by low pressure liquid chromatography (silica gel, EtOAc/hexanes, gradient elution). Fractions containing the desired product were decolorized with activated carbon affording 1-(2-hydroxy-2-methylpentan-3-yl)-1H-indole-4,5-dicarbonitrile (0.0285 g, 18% yield) as an amber film: 1H NMR (400 MHz, CDCl3) δ 7.75-7.61 (m, 2H), 7.53 (d, J=8.6 Hz, 1H), 6.88 (d, J=3.3 Hz, 1H), 4.16-4.07 (m, 1H), 2.20-2.01 (m, 2H), 1.37 (s, 3H), 1.08 (s, 3H), 0.65 (t, J=7.3 Hz, 3H); MS (LCMS ES+) m/z 268 ([M+H]+, 26%), 285 (100%), 309 ({[M+H]+MeCN}+, 78%).

Provenance & Evidence