Diethyl ((6-methoxypyridin-2-yl)methyl)phosphonate → (E)-tert-butyl 4-(2-(2-(6-methoxypyridin-2-yl)vinyl)-8-morpholinoimidazo[1,2-a]pyrazin-5-yl)benzoate

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To a solution of diethyl ((6-methoxypyridin-2-yl)methyl)phosphonate (76.2 mg, 0.29 mmol, prepared according to literature procedure: J. Med. Chem. 2005, 48, 5884-5887), n-BuLi (0.184 mL, 0.29 mmol, 1.6 M in hexanes) was added dropwise. After stirring the resulting mixture for 15 min at rt, it was slowly added to a suspension of compound 67a (100 mg, 0.25 mmol) in THF (5 mL). The resulting mixture was stirred at rt for 30 min and quenched with saturated NH4Cl (2 mL). The reaction mixture was treated with water (20 mL) and extracted with EtOAc (2×40 mL). The combined organic layers were washed with brine (20 mL), dried over Na2SO4, filtered, and concentrated under reduced pressure. The residue obtained was purified by flash column chromatography on silica gel (0-100% EtOAc/heptanes) to give (E)-tert-butyl 4-(2-(2-(6-methoxypyridin-2-yl)vinyl)-8-morpholinoimidazo[1,2-a]pyrazin-5-yl)benzoate, which was subjected to TFA deprotection using the methods described in Example 57, Step A to yield the title compound 7 containing 0.1 eq. of TFA. 1H-NMR (400 MHz, DMSO-d6) δ (ppm): 8.25 (s, 1H), 8.11 (m, J=7.8 Hz, 2H), 7.83 (m, J=7.8 Hz, 2H), 7.63-7.69 (m, 1H), 7.69-7.75 (m, 1H), 7.49 (s, 1H), 7.40 (d, J=15.7 Hz, 1H), 7.08 (d, J=7.1 Hz, 1H), 6.70 (d, J=8.1 Hz, 1H), 4.29 (br. s., 4H), 3.92 (s, 3H), 3.80 (br. s., 4H). Mass Spectrum (LCMS, ESI pos.) Calcd. for C25H23N5O4: 458.2 [M+H]. found 458.4.

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