反应详情

A Parr flask was flushed with argon and charged with 10% palladium on charcoal (0.74 g), followed by the addition of Boc-L-alanyl-L-alanyl-L-proline benzyl ester (1.8 g, 4.0 mmol) dissolved in tert-butanol (300 ml). The reaction mixture shaken under 30 psi of hydrogen at 35° C. for 5 hr. After cooling to room temperature, ethanol (50 ml) was added and the solution was filtered through celite and the filtrate concentrated on a rotary evaporator. The residue was azeotroped with chloroform-hexane to remove the last traces of tert-butanol and then dried under high vacuum to give Boc-L-alanyl-L-alanyl-L-proline (1.40 g, 3.9 mmol) in 98% yield.

1. customA Parr flask was flushed with argon
2. additioncharged with 10% palladium on charcoal (0.74 g)
3. filtrationthe solution was filtered through celite
4. concentrationthe filtrate concentrated on a rotary evaporator
5. customThe residue was azeotroped with chloroform-hexane
6. customto remove the last traces of tert-butanol
7. customdried under high vacuum