To a solution of EXAMPLE 23A (12.47 g, 60.83 mmol) in a mixture of N,N-dimethylformamide (150 mL) and triethylamine (150 mL) was added 1-iodo-4-nitrobenzene (18.18 g, 73 mmol), CuI (2.33 g, 12.2 mmol) and tetrakis(triphenylphosphine)palladium(0) (3.51 g, 3.04 mmol). The reaction mixture was stirred at room temperature overnight, and partitioned between ethyl acetate and brine. The organic phase was washed with brine, and concentrated. The crude material was purified by flash chromatography (20% ethyl acetate in hexane) to afford the title compound 1H NMR (400 MHz, dimethylsulfoxide-d6): δ 2.36 (br s, 1H), 3.59 (s, 2H), 3.72 (s, 2H), 3.74 (s, 3H), 3.77 (s, 3H), 6.48 (dd, J=6.0, 2.4 Hz, 1H), 6.53 (d, J=2.0 Hz, 1H), 7.20 (d, J=8.4 Hz, 1H), 7.67 (d, J=8.8 Hz, 2H), 8.22 (d, J=8.8 Hz, 2H).
