Hydrochloric Acid → 4-(4-(Tert-butoxycarbonylamino)phenylthio)-3-(7-isopropylquinazolin-4-ylamino)benzoic acid

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Reaction Steps

The product of Example 432D (0.505 g, 0.927 mmol) was suspended in 1,4-dioxane (6 mL), treated with a solution of lithium hydroxide monohydrate (0.078 g, 1.85 mmol) in water (3 mL) at room temperature, then heated at 50° for one hour. The reaction was diluted with water (25 mL), adjusted to pH 1 with 1N aqueous HCl, and extracted with ethyl acetate (50 mL). The organic extract was washed with water (25 mL) and brine (25 mL), dried over magnesium sulfate, filtered, and concentrated by rotary evaporation to afford the title compound as a light yellow solid (0.433 g, 0.816 mmol, 88%). 1H NMR (300 MHz, DMSO-D6) δ ppm 1.31 (d, J=6.99 Hz, 6 H) 1.48 (s, 9 H) 2.98-3.23 (m, 1 H) 6.92 (d, J=8.09 Hz, 1 H) 7.36 (d, J=8.46 Hz, 2 H) 7.54 (d, J=8.82 Hz, 2 H) 7.59 (d, J=11.77 Hz, 1 H) 7.73 (d, J=8.09 Hz, 1 H) 7.89 (s, 1 H) 8.34-8.49 (m, 2 H) 9.61 (s, 1 H) 9.94 (s, 1 H). MS (ESI+) m/z 531 (M+H)+.

Provenance & Evidence