反应详情

温度

5 °C

This compound was synthesized by a modified procedure of Kurtz et al.93. Copper (II) carbonate, basic (16.3 g, 74.0 mmoles) was added to a hot (80° C.) solution of L-lysine (15 g, 82.0 mmoles) in distilled water (250 mL). Excess copper carbonate was removed by gravity filtration while the mixture was still warm. The epsilon amino group of L-lysine was benzoylated by the dropwise addition of benzoyl chloride (14 g, 99.0 mmoles) in THF (35 mL) to the above solution after being cooled to 5° C. Sodium bicarbonate was added in small portions (total 14 g, 167.0 mmoles) to maintain the pH of the aqueous solution above 7 (pH was monitored with neutral litmus paper). The cold solution was maintained at 5° C. for 4 h and 2 d at room temperature. A hot (80° C.) solution (1 L) of EDTA (14.6 g, 0.25 moles) was added to the reaction mixture, stirred for 1 h and cooled to 10° C. The precipitate collected by vacuum filtration was washed with water and 30 mL of 95% ethanol. The powder, containing the product was purified by first adding the powder to 1×10-1M hydrochloric acid (300 mL) and filtering off the sediment. The filtrate was slowly neutralized with 0.01N sodium hydroxide and the precipitate collected by gravity filtration. The latter was then air-dried to give 13 g (57 mmoles) (69.5% yield) of a white powder, mp 232°-234° C. (lit.93 mp 230°-233° C.). 1H-NMR (DMSO-d6) δ 1.36-190(6Ha,m); 3.20(2Hb,m); 4.20-4.53(1Hc,m); 7.16(1Hd,m, rotamer of amide -NH); 7.43(2He,e', app. dd, Jef =8Hz, Jee,=2Hz); 7.63(1Hf, app. dd, Jfe =8Hz, Jfg =2Hz); 8.03(2Hf,f', app dd, Jge =8Hz, Jgf =2Hz); 9.50(1Hh,s)ppm. IR (Nujol) 3330, 3030, 1687, 1270, 735, 695 cm-1.

1. customThis compound was synthesized by a modified procedure of Kurtz et al.93
2. customExcess copper carbonate was removed by gravity filtration while the mixture
3. temperaturewas still warm
4. temperatureto maintain the pH of the aqueous solution above 7 (pH was monitored with neutral litmus paper)
5. temperatureThe cold solution was maintained at 5° C. for 4 h and 2 d at room temperature
6. temperaturecooled to 10° C
7. filtrationThe precipitate collected by vacuum filtration
8. washwas washed with water and 30 mL of 95% ethanol
9. additionThe powder, containing the product
10. customwas purified
11. additionby first adding the powder to 1×10-1M hydrochloric acid (300 mL)
12. filtrationfiltering off the sediment
13. filtrationthe precipitate collected by gravity filtration
14. customThe latter was then air-dried