1,2-Dichloroethane → tert-Butyl 4-(5-((5S)-3-(3,3-dimethylbutyl)-4-oxo-5-(2-oxo-2-(4-(2-oxo-4,5-dihydro-1H-benzo[d][1,3]diazepin-3(2H)-yl)piperidin-1-yl)ethyl)thiazolidin-2-yl)thiazol-2-yl)piperidine-1-carboxylate

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To a solution of 2-((5S)-2-(2-(1-(tert-Butoxycarbonyl)piperidin-4-yl)thiazol-5-yl)-3-(3,3-dimethylbutyl)-4-oxothiazolidin-5-yl)acetic acid (360 mg, 0.7 mmol, 1 eq) in DCM (8 mL) was added HOBt (162 mg, 1.06 mmol, 1.5 eq), EDC (202 mg, 1.06 mmol, 1.5 eq), DIEA (364 mg, 2.8 mmol, 4 eq) and 3-(piperidin-4-yl)-4,5-dihydro-1H-benzo[d][1,3]diazepin-2(3H)-one (207 mg, 0.84 mmol, 1.2 eq). The resulting mixture was stirred at room temperature for 18 hr. The reaction mixture was diluted with DCM (10 mL) and washed with water (5 mL), brine (5 mL), dried (MgSO4) then concentrated in vacuo. The residue was purified by column chromatography over silica gel eluted with 0 to 10% MeOH in DCM to afford 390 mg of compound I-492 in 75% yield. (M+1) 739. 1H NMR (CDCl3) δ 7.19-6.91 (m, 5H), 6.75 (d, J=7.8 Hz, 1H), 5.68 (m, 1H), 4.75 (m, 1H), 4.47 (m, 1H), 4.18 (m, 1H), 3.93 (m, 1H), 3.46-2.67 (m, 11H), 2.08 (m, 6H), 1.71 (m, 6H), 1.47 (m, 9H), 0.85 (m, 9H) ppm.

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