反应详情

TMSCN (4.27 ml, 32 mmol) was added cautiously (reaction is exothermic) to a stirred solution of glycine benzyl ester (5.3 g, 32 mmol, prepared from the HCl salt by partitioning between EtOAc and NaHCO3 solution) and acetaldehyde (1.8 ml, 32 mmol) in methylene chloride (11 ml). After 4 h the volatiles were removed in vacuo and the residue was taken up in EtOAc and was washed with brine, dried (Na2SO4) and evaporated in vacuo to an oil. The oil was redissolved in EtOAc and 9.9 M HCl in EtOH (38.4 mmol) was added to give a crystalline precipitate which was isolated by filtration and washing with EtOAc, to give 1-11: 1H NMR (CDCl3) δ1.49 (d, J=7.1 Hz, 3 H, CH3), 3.54 (d, J=17.3 Hz, 1 H, CHAHB), 3.64 (d, J=17.3 Hz, 1 H, CHAHB), 3.74 (q, J=7.0 Hz, 1 H, a-CH), 5.18 (s, 2 H, CH2O), 7.36 (s, 5 H, Ph).

1. customAfter 4 h the volatiles were removed in vacuo
2. washwas washed with brine
3. dry with materialdried (Na2SO4)
4. customevaporated in vacuo to an oil
5. dissolutionThe oil was redissolved in EtOAc
6. customto give a crystalline precipitate which
7. customwas isolated by filtration
8. washwashing with EtOAc
9. customto give 1-11