Reaction Steps
1,1-dimethylethyl 4-(3-bromo-8-chloro-6,11-dihydro-5H-benzo[5,6] cyclohepta[ 1,2-b]pyridin-11-yl)-2(R)-carboxy-1-piperazinecarboxylate (0.7225 g, 1.3 mmoles) (prepared as described in Preparative Example 6), the title compound from Preparative Example 8, Step B (0.3382 g, 1.7 mmoles), 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (0.3354 g, 1.7 mmoles), 1-hydroxybenzotriazole (0.2364 g, 1.7 mmoles) and 4-methylmorpholine (0.192 mL, 1.7 mmoles) were dissolved in anhydrous DMF (3 mL) and the mixture was stirred under argon at 25° C. for 319 h. The solution was evaporated to dryness and the residue was taken up in dichloromethane and washed with saturated aqueous sodium bicarbonate, water, dried (MgSO4), filtered and evaporated to dryness. The residue was chromatographed on silica gel using 3% (10% conc. NH4OH in methanol)-dichloromethane as the eluant to give the partially purified title compounds. The appropriate fractions were rechromatographed using 1.5% (10% conc. NH4OH-methanol)-dichloromethane as the eluant to give title compound as a mixture of 4 diastereoisomers (0.3718 g, 39%): FABMS: m/z 711.4 (MH+); δH (CDCl3) 1.39 (9H, s, CH3), 6.91, 7.08, 7.13, 7.17, 7.56, 7.67 (Ar—H), 6.97 (1H, s, Im-H5), 7.04 (1H, s, Im-H4), 7.58 (1H, s, Im-H2) and 8.38 ppm (1H, m, Ar—H2); δC(CDCl3) CH3: 28.3/28.4, 28.3/28.4, 28.3/28.4; CH2: 18.9, 24.9/25.0/25.5, 26.8, 30.2, 30.5, 36.2, 40.1, 42.7/43.0, 46.5/46.7, 50.1/50.3/50.7, 52.7/52.9; CH: 46.9, 51.6/52.0, 78.5, 119.0, 126.2/126.3, 128.6, 130.8/130.9, 132.6, 137.0, 141.5, 146.9/147.2; C: 80.2, ˜120.1, 134.3, 134.9, 137.6, 140.8, ˜155.1/156.1, ˜156.8, ˜170.3.
