Triethylamine → 6'-(Cyclopropylethynyl)-5''-methyl-3'H-dispiro[cyclobutane-1, 2'-indene-1',2''-imidazol]-4''-amine

Participants

Reaction Conditions

Reaction Steps

To a solution of 6′-bromo-5″-methyl-3′H-dispiro[cyclobutane-1,2′-indene-1′,2″-imidazol]-4″-amine (Example 54, 0.10 g, 0.31 mmol) in DMF (10 mL) under argon was added ethynylcyclopropane (0.031 g, 0.47 mmol), tetrakis(triphenylphosphine)palladium(0) (0.036 g, 0.03 mmol) and triethylamine (1.31 mL, 9.43 mmol). The reaction mixture was stirred at r.t. for 5 min before addition of cuprous iodide (8.98 mg, 0.05 mmol). The reaction mixture was stirred overnight at 65° C. The reaction mixture was partitioned between sat aq. NaHCO3 and EtOAc. The organic phase was dried over MgSO4 and concentrated to give a crude product which was purified by preparative chromatography to afford the title compound (0.046 g, 48% yield): 1H NMR (500 MHz, DMSO-d6) δ ppm 0.60-0.73 (m, 2H), 0.77-0.89 (m, 2H), 1.46 (tt, 1H), 1.50-1.65 (m, 4H), 1.72-1.85 (m, 1H), 2.08-2.16 (m, 1H), 2.18 (s, 3H), 3.07-3.23 (m, 2H), 6.54 (d, 1H), 6.60 (s, 2H), 7.16 (dd, 1H), 7.20-7.27 (m, 1H); MS (ES+) m/z 304 [M+H]+.

Provenance & Evidence