反应详情

Acetic anhydride (96 mmol, 9.80 g) was added dropwise to a well stirred solution of D-(−) penicillamine (40 mmol, 5.97 g) in pyridine (50 mL) at 0° C. After 30 min, the flask was removed from ice and allowed to stir at room temperature for 15 h. The resultant orange solution was partitioned between chloroform and dilute HCl and washed 4× with dilute HCl. After drying over MgSO4, the organic phase was evaporated to yield an orange residue. The residue was first dissolved in absolute ethanol (20 mL), and then precipitated in pentane at −78° C. The light yellow crystalline product was isolated by filtration (2.07 g, 30%). 1H NMR (CDCl3) δ 1.65 (s, CH3), 1.86 (s, CH3), 2.05 (s, NHCOCH3), 5.68-5.70 (d, CH(CH3)2), 6.56 (NHCOCH3). 13C NMR (CDCl3) δ 22.52 (NHCOCH3), 26.20 (CH(CH3)2), 30.22 (CH(CH3)2), 51.23 (CH), 169.37 (NHCOCH3), 192.21 (SCO).

1. customthe flask was removed from ice
2. customThe resultant orange solution was partitioned between chloroform and dilute HCl
3. washwashed 4× with dilute HCl
4. dry with materialAfter drying over MgSO4
5. customthe organic phase was evaporated
6. customto yield an orange residue
7. customprecipitated in pentane at −78° C
8. customThe light yellow crystalline product was isolated by filtration (2.07 g, 30%)