Triethylamine → 3-(5-fluoro-2H-benzo[d][1,2,3]triazol-2-yl)-2-hydroxy-5-methoxybenzyl methacrylate

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The esterification was carried out using the product. In a 250 ml round bottom flask equipped with a magnetic stirrer and nitrogen inlet was dissolved 5.06 g (17.5 mmol) 2-(5-fluoro-2H-benzo[d][1,2,3]triazol-2-yl)-6-(hydroxymethyl)-4-methoxyphenol in 60 ml anhydrous THF. Triethylamine (8.7 ml, 62 mmol)) was added and the mixture was cooled to −10-0° C. Methacryloyl chloride (2.26 g, 21.6 mmol) was added dropwise and the mixture was stirred for 1 hr at −10° C. followed by 20 hours at ambient temperature. The salts were filtered and rinsed with 100 ml THF (≧99.9%, anhydrous containing inhibitor, Aldrich). Diethyl ether (100 ml) was added to the filtrate, which was washed with 1N HCl and water, dried over magnesium sulfate, filtered, and concentrated by rotary evaporation to give the desired product, which was recrystallized in ethanol to give 2.5 g (40%) of a yellow solid. 1H NMR (CDCl3) delta: 11.03 (s, 1H, phenol OH), 7.94 (m, 1H, Ar—H benzotriazole ring), 7.87 (s, 1H, Ar—H phenol ring), 7.53 (m, 1H, Ar—H benzotriazole ring), 7.29 (m, 1H, Ar—H benzotriazole ring), 7.05 (s, 1H, Ar—H phenol ring), 6.21 (s, 1H, C═C—H trans), 5.61 (s, 1H, C═C—H cis), 5.39 (s, 2H, Ar—CH2), 3.89 (s, 3H, Ar—OCH3), 2.01 (s, 3H, C═C—CH3).

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