Methyl iodide → N-Boc-4-iodophenylalanine methylester

Participants

Reaction Steps

To a solution of 5.02 g (12.8 mmol) of N-Boc-4-iodophenylalanine in 60 mL of DMF was added NaHCO3 (1.42 g, 16.9 mmol) followed by methyl iodide (3.0 mL, 48.2 mmol). The mixture was stirred under argon for 40 h at room temperature. After this time, 150 mL of ethyl acetate was added, and the mixture was washed with 3×100 mL of deionized water. The organic layer was separated, dried over Na2SO4, and concentrated under vacuum to yield 5.80 g of a yellow oily solid. The crude product was purified by flash chromatography (1:5 ethyl acetate: hexanes) to afford a white solid (4.72 g, 91%). mp 79-80° C.; 1H NMR (400 MHz, CDCl3) δ 1.43 (s, 9H), 3.04 (2dd, J=4.8 Hz, 12.8 Hz), 3.72 (s, 3H), 4.58 (m, 1H), 4.97 (brs, NH, 1H), 6.88 (d, J=7.8 Hz, 2H), 7.62 (d, J=7.8 Hz, 2H); HRMS (ESI, M+1) calcd for C15H21INO4 406.0510. Found 406.0515.

Provenance & Evidence