Reaction Steps
A suspension of 14 (0.20 g, 0.47 mmol) in cooled (0° C.) dioxane (5 mL) was saturated with HCl, allowed to warm to r.t. over 2 h and evaporated. 5-[2-(Dimethylamino)ethoxy]-1-H-indole-2-carboxylic acid hydrochloride (0.13 g, 0.47 mmol) [Milbank et al., J. Med. Chem., 1999, 42, 649], EDCI (0.27 g, 1.42 mmol) and DMA (3 mL) were added to the remaining yellow solid, and the red mixture was stirred at r.t. for 20 h. The mixture was partitioned between EtOAc and 5% NaHCO3 solution. The aqueous layer was extracted with EtOAc (×3). The EtOAc extracts were dried (brine, Na2SO4). Flash chromatography (Alumina, EtOAc/MeOH; 49:1, then 9:1) gave 2-[(2-{[5-(benzyloxy)-1-(chloromethyl)-1,2-dihydro-3H-pyrrolo[3,2-f]quinolin-3-yl]carbonyl}-1H-indol-5-yl)oxy]-N,N-dimethylethanamine (17b) (0.22 g, 84%) as a yellow solid: mp 176–179° C.; 1H NMR [(CD3)2SO]δ 11.68 (s, 1 H), 8.79 (dd, J=4.1, 1.5 Hz, 1 H), 8.41 (dd, J=8.6, 1.5 Hz, 1 H), 8.29 (s, 1 H ), 7.56 (m, 3 H), 7.40 (m, 4 H), 7.17 (d, J=2.3 Hz, 1 H ), 7.11 (d, J=1.5 Hz, 1 H), 6.92 (dd, J=9.0, 2.4 Hz, 1 H), 5.32 (s, 2 H), 4.82 (dd, J=10.7, 9.6 Hz, 1 H), 4.58 (dd, J=10.9, 2.1 Hz, 1 H), 4.32 (m, 1 H), 4.05 (t, J=5.7 Hz, 2 H), 4.04 (m, 1 H), 3.93 (dd, J=11.2, 6.9 Hz, 1 H), 2.65 (t, J=5.8 Hz, 2 H), 2.23 (s, 6H); 13C NMR [(CD3)2SO]δ 160.3, 154.5, 153.0, 147.3, 142.3, 137.4, 136.7, 131.6, 131.3, 130.6,128.4, 127.9, 127.7, 127.4, 125.1, 122.4, 116.2, 116.0, 113.1, 105.5, 103.1, 102.0, 70.0, 66.9, 66.2, 57.8, 54.9, 47.7, 45.5, 40.7.
