A stirred solution of Intermediate 241B (18.34 mg, 0.102 mmol) in toluene (1 mL) at RT under nitrogen was added TEA (0.043 mL, 0.305 mmol), DPPA (0.047 mL, 0.204 mmol) and the reaction mixture was heated at 70° C. for 2 h. The reaction mass was cooled to RT and to it was added a solution of Intermediate 185B (30 mg, 0.102 mmol) in THF (1 mL) and stirred for 16 h. The reaction mass was diluted with ethyl acetate (5 mL) and the organic layer was separated. The organic layer was washed sequentially with an aqueous solution of 10% NaHCO3, water, and brine, then dried over Na2SO4, filtered and the filtrate concentrated under reduced pressure. The crude product was purified by preparative HPLC to afford Compound 241 as pale yellow solid (10 mg, 20% yield). The HPLC Retention times are 1.453 min. and 1.467 min. (Methods J and K respectively); MS(ES): m/z=472.2[M+H]+; 1H NMR (400 MHz, DMSO-d6) δ ppm 7.85 (dd, J=7.28, 2.13 Hz, 1H), 7.69 (ddd, J=8.63, 4.80, 2.13 Hz, 1H), 7.39-7.52 (m, 1H), 7.11-7.33 (2bs, 2H), 7.10 (d, J=7.34 Hz, 1H), 6.36-6.88 (m, 1H), 4.73 (s, 2H), 4.13 (t, J=5.27 Hz, 2H), 3.72-3.99 (m, 5H), 2.00-2.16 (m, 1H), 1.68-1.94 (m, 2H), 1.33-1.53 (m, 1H).
