Cesium carbonate → 5-(3-(ethylsulfonyl)phenyl)-3-methyl-8-((1-methylpiperidin-4-yl)methoxy)-9H-pyrido[2,3-b]indole

Participants

Reaction Conditions

Reaction Steps

To a stirred solution of Compound 175 (170 mg, 0.49 mmol) and 3-(ethylsulfonyl)phenylboronic acid (265 mg, 1.24 mmol) in anhydrous and degassed dioxane (5 mL), were added Pd(dba)2 (70 mg, 0.12 mmol), PCy3 (0.34 mL, 20% wt solution in toluene, 0.24 mmol) and Cs2CO3 (479 mg, 1.47 mmol), under nitrogen. After being stirred for 6 h. under reflux (oil bath temperature 125° C.) the reaction was diluted with EtOAc and filtered through a small pad of celite. The residue was washed thoroughly with EtOAc and 10% MeOH in CH2Cl2. All the washings and filtrate were concentrated in vacuum and the crude residue was triturated with ether and then with MeOH and then purified through preparative HPLC to give Compound 176 (176 mg, 75%). 1H NMR (400 MHz, DMSO-d6) δ ppm 1.20 (t, J=7.34 Hz, 3 H) 1.50-1.61 (m, 2 H) 2.18 (br. s., 1 H) 2.13-2.20 (m, 1 H) 2.23-2.31 (m, 5 H) 2.82 (s, 3 H) 2.98-3.09 (m, 2 H) 3.39 (q, J=7.34 Hz, 2 H) 3.54 (d, J=10.60 Hz, 2 H) 4.12 (d, J=6.52 Hz, 2 H) 7.06-7.17 (m, 2 H) 7.53 (s, 1 H) 7.85 (t, J=7.74 Hz, 1 H) 7.96 (d, J=7.66 Hz, 1 H) 8.00 (d, J=7.66 Hz, 1 H) 8.06 (s, 1 H) 8.28 (d, J=1.47 Hz, 1 H) 11.83 (br. s., 1 H), [M+H] calc'd for C27H32N3O3S, 478.2; found, 478.4; [M+H+TFA] calc'd for C29H33N3O5F3S, 592.2; found, 592.4.

Provenance & Evidence