反应详情

温度

0 °C

The iodo derivative 17 (3.5 mmol) (prepared as shown in FIG. 6) was dissolved in 40 mL of THF and cooled in an ice bath (0° C.) and a solution of lithium hydroxide (7.0 mmol) in 12 mL of water was added dropwise under argon. The resulting mixture was stirred at 0° C. for 4 h and then 2 h at room temperature. The reaction mixture was then neutralized with acetic acid to pH 5 and extracted with ethyl acetate. The organic phase was dried using Na2SO4, filtered and evaporated to dryness to provide an oil which was purified by silical gel column chromatography resulting in N-(tert-butoxycarbonyl)-3,4-di(tert-butoxycarbonyloxy)-6-iodo-L-phenylalanine (23).

1. custom2 h
2. customat room temperature
3. extractionextracted with ethyl acetate
4. customThe organic phase was dried
5. filtrationfiltered
6. customevaporated to dryness
7. customto provide an oil which
8. customwas purified by silical gel column chromatography
9. customresulting in N-(tert-butoxycarbonyl)-3,4-di(tert-butoxycarbonyloxy)-6-iodo-L-phenylalanine (23)