2-(5-(Trimethylstannyl)pyridin-2-yl)propan-2-ol → HCID 178496591, compound

Participants

Reaction Conditions

Reaction Steps

2-(5-(Trimethylstannyl)pyridin-2-yl)propan-2-ol (See Example 5.E) (9.43 g, 31.4 mmol), 7-bromo-1-(trans-4-methoxycyclohexyl)-3,4-dihydropyrazino[2,3-b]pyrazin-2(1H)-one (10.02 g, 29.4 mmol), [1,1′-bis(diphenyl-phosphino)-ferrocene]dichloropalladium(II) dichloromethane adduct (2.398 g, 2.94 mmol) and N,N-dimethylformamide (25 mL) were combined in a round-bottom flask with a stirbar. The atmosphere in the vessel was removed under vacuum and replaced with nitrogen gas three times. The resulting mixture was stirred vigorously and heated at 120° C. under nitrogen for 35 min. The resulting mixture was purified using flash chromatography, split into 4 separate columns, (2-15% methanol in dichloromethane). Fractions containing the desired product were combined and most of the solvent removed under reduced pressure. The resulting mixture was purified using reverse-phase preparatory HPLC (20-40% acetonitrile+0.1% TFA in water+0.1% TFA, over 30 min), split into 6 runs. Fractions containing the desired product were combined and all of the acetonitrile and some of the water were removed under reduced pressure at 25° C. The remaining yellow solution was loaded onto 50 g of Strata X-C ion exchange resin from Phenomenex. The column was washed successively with water, acetonitrile, methanol and then 5% ammonium hydroxide in methanol. The product eluted with the 5% ammonium hydroxide in methanol wash and was concentrated under reduced pressure and dried under high vacuum to give the desired product (4.85 g, 12.20 mmol, 42% yield) as a pink foam-solid. 1H NMR (400 MHz, DMSO-d6) δ (ppm) 9.03 (d, J=1.56 Hz, 1H), 8.28 (s, 1H), 8.24 (dd, J=2.34, 8.20 Hz, 1H), 7.74 (d, J=7.81 Hz, 1H), 7.61 (s, 1H), 5.26 (s, 1H), 4.90 (tt, J=3.71, 12.10 Hz, 1H), 4.13 (s, 2H), 3.28 (s, 3H), 3.20 (tt, J=4.00, 10.84 Hz, 1H), 2.58 (qd, J=2.93, 12.82 Hz, 2H), 2.14 (d, J=10.15 Hz, 2H), 1.68 (d, J=10.93 Hz, 2H), 1.47 (s, 6H), 1.17-1.35 (m, 2H); MS (ESI) m/z 398.3 [M+1]+; mp 196-198° C. (uncorrected).

Provenance & Evidence