反应详情

Trifluoroacetic acid (120 mL) was added dropwise to the product of Step 1 (80 g) in dichloromethane (120 mL) at 0° C. over a period of 30 min. The reaction mixture was stirred at room temperature for 2 h. After completion of reaction, reaction mixture was concentrated to remove excess trifluoroacetic acid under vacuum to afford azetidin-3-ylmethyl dimethylphosphinate TFA salt (90 g) as brown liquid. LC ESI: [M+H]+ m/z 164.2; HPLC purity; >97%. 1H NMR (400 MHz, CD3OD) δ: 1.62 (s, 3H), 1.65 (s, 3H), 3.23-3.27 (m, 1H), 4.02 (dd, J=7.7, 11.1 Hz, 2H), 4.11-4.19 (m, 4H).

1. customAfter completion of reaction, reaction mixture
2. concentrationwas concentrated
3. customto remove excess trifluoroacetic acid under vacuum