Hydrochloric Acid → 2-(2,2-Difluoro-2-(fluorosulfonyl)acetamido)ethyl methacrylate

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A 500 ml flask was charged with CH2Cl2 (80 ml) under nitrogen stream and stirred for 10 min at 0° C. and then 2-(fluorosulfonyl)difluoroacetyl fluoride (29.9 g, 166.0 mmol, 1.5 equivalent (eq.)) was added. After 25 minutes, a CH2Cl2 (160 ml) solution of 2-aminoethyl methacrylate hydrochloride (18.4 g, 111.0 mmol, 1.0 eq.) and pyridine (17.5 g, 221.0 mmol, 2.0 eq.) was added drop wise to the mixture over 50 minutes. The mixture was allowed to warm to room temperature (RT) and stirred for 3 hours at RT. 1N HCl was added to the final reaction mixture and the lower layer was separated and washed with 1N HCl and Brine. The solution was dried over anhydrous MgSO4, filtrated and then CH2Cl2 was removed by an evaporator. The crude product was purified by recrystallization (hexane/CHCl3). The target compound was obtained as a white solid (20.4 g) in 64% yield. 1H-NMR (400 MHz, CDCl3); delta=1.93 (dd, J=1.1, 1.2 Hz, 3H), 3.73 (td, J=5.4, 5.2 Hz, 2H), 4.35 (dd, J=5.1, 5.0 Hz, 2H), 5.63 (dq, J=1.4, 1.5 Hz, 1H), 6.12-6.14 (m, 1H), 7.09 (brs, 1H). 19F-NMR (376 MHz, CDCl3, C6F6 as standard); delta=40.68 (t, J=5.1 Hz, 1F), −105.91 (d, J=4.8 Hz, 2F).

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