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0 °C

To a solution of 3-[5-isopropenyl-2,6-bis-(2-trimethylsilanyl-ethoxy)-pyrimidine-4-carbonyl]-5-methyl-benzonitrile (0.636 g, 1.28 mmol) in dichloromethane (10 mL) at 0° C. was added TFA (2 mL). Reaction mixture was stirred at 0° C. for 30 min, concentrated and purified by flash column chromatography (silica gel, 0 to 10% methanol/dichloromethane) to give a yellow solid (0.311 g, 82%). 1H NMR (300 MHz, CD3OD): δ 8.11 (s, 1H), 8.03 (s, 1H), 7.88 (s, 1H), 4.91 (s, 1H), 4.75 (s, 1H), 2.49 (s, 3H), 1.82 (s, 3H). Mass spectrum: 296.1 (M+H)+.

1. customReaction mixture
2. concentrationconcentrated
3. custompurified by flash column chromatography (silica gel, 0 to 10% methanol/dichloromethane)