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0 °C

A solution of 15 g (51 mmol) of 4-iodo-D,L-phenylalanine and 16.2 ml (127.5 mmol) of Me3SiCl in 150 mL of dichloromethane was heated at reflux for 1 h under N2. The reaction mixture was cooled to 0° C. with an ice bath and 17.7 mL (127 mmol) of triethyl amine was added, followed by 5.83 mL (61.2 mmol) of acetic anhydride. The mixture was stirred at 0° C. for 30 min, then warmed up to room temperature and stirred for another 30 min. The reaction was quenched by adding 1M aqueous sodium hydroxide and then the mixture was acidified with 2M aqueous hydrogen chloride to pH 1. The precipitate was collected by filtration and dried under vacuum to afford 16 g (95%) of N-acetyl-4-iodophenylalanine as a white solid: 1H NMR (DMSO-d6) 8.19 (d, 1H), 7.61 (d, 2H), 7.02 (d, 2H), 4.39-4.31 (m, 1H), 3.01-2.92 (dd, 1H), 3.80-2.69 (dd, 1H), 2.67 (s, 3H).

1. temperatureat reflux for 1 h under N2
2. temperaturewarmed up to room temperature
3. stirringstirred for another 30 min
4. customThe reaction was quenched
5. additionby adding 1M aqueous sodium hydroxide
6. filtrationThe precipitate was collected by filtration
7. customdried under vacuum