Ammonium Chloride → (E)-tert-Butyl 4-(8-morpholino-2-(2-(5,6,7,8-tetrahydroquinolin-2-yl)vinyl)imidazo[1,2-b]pyridazin-3-yl)benzoate

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Reaction Steps

To a solution of compound 58a (125 mg, 0.441 mmol) in 2.5 mL of THF at RT was added n-BuLi (275 μL, 0.441 mmol, 1.6M in hexane) dropwise. After stirring at rt for 15 min, the mixture was added slowly to a suspension of compound 5f (150 mg, 0.367 mmol) in 2.5 mL of THF. The resulting mixture was stirred at rt for 30 min, then 2 mL of saturated NH4Cl was added. The mixture was diluted with 10 mL of water, then extracted with EtOAc (2×20 mL). The combined organic layers were washed with brine (15 mL) and dried with Na2SO4, filtered and concentrated. The solvent was removed in vacuo and the residue was purified by flash column chromatography on silica gel (0:1-1:4 EtOAc/DCM) to afford compound 60a as a pale yellow solid. 1H-NMR (CDCl3; 400 MHz) δ 8.16 (d, J=8.1 Hz, 2H), 7.98 (d, J=5.6 Hz, 1H), 7.79 (d, J=8.6 Hz, 2H), 7.73 (d, J=15.7 Hz, 1H), 7.50-7.58 (m, 1H), 7.29-7.35 (m, 1H), 7.21-7.26 (m, 1H), 6.11 (d, J=5.6 Hz, 1H), 4.02-4.09 (m, 4H), 3.93-4.02 (m, 4H), 2.93 (t, J=6.3 Hz, 2H), 2.77 (t, J=6.1 Hz, 2H), 1.86-1.95 (m, 2H), 1.77-1.86 (m, 2H), 1.63 (s, 9H). Mass spectrum (ESI, m/z): Calcd. for C32H35N5O3, 538.1 (M+H). found 538.0.

Provenance & Evidence