反应详情

Trimethylsilyl cyanide (4.0 mL, 30 mmol) was added cautiously to a stirred solution of benzyl glycine free base (5.0 g, 30 mmol) and acetaldehyde (1.7 mL, 30 mmol) in dichloromethane (15 mL) under argon atmosphere. After 15 hours, the volatile components were removed in vacuo, and the residue was dissolved in ethyl acetate (200 mL), washed with brine (100 mL), dried (Na2SO4) and evaporated to an oil. The oil was redissolved in ether (30 mL) and ethanol (30 mL), and 1 M HCl in ether (33 mL) was added dropwise to give the title compound as an off-white crystalline precipitate (6.60 g, 100%). mp: 137-138° C. 1H NMR (CD3OD) δ 7.31-7.48 (m, 5H), 5.32 (s, 2H), 4.68 (q, 1H, J=7.0 Hz), 4.22 (s, 2H), 1.73 (d, 3H, J=7.1 Hz). CI MS m/z=192 (M+H). Anal. Calcd. for C12H14N2O2.HCl: C, 56.49; H, 5.95; N, 11.00. Found: C, 56.32; H, 5.88; N, 10.89.

1. customthe volatile components were removed in vacuo
2. dissolutionthe residue was dissolved in ethyl acetate (200 mL)
3. washwashed with brine (100 mL)
4. dry with materialdried (Na2SO4)
5. customevaporated to an oil
6. dissolutionThe oil was redissolved in ether (30 mL)
7. additionethanol (30 mL), and 1 M HCl in ether (33 mL) was added dropwise