反应详情

565 mg of N-[(benzyloxy)carbonyl]-L-leucine (S)-1-[[(2S,3S)-3-ethyl-4-oxo-2-oxetanyl]methyl]octadecyl ester were dissolved in 12 ml of THF. The mixture was hydrogenated at room temperature in the presence of 40 mg of 10% Pd/C. After the reaction was finished the catalyst was filtered off and the filtrate was evaporated. The residue was taken up in 9 ml of THF and 71 μl of formic acid/acetic acid anhydride were added dropwise. The mixture was diluted with 5 ml of diethyl ether and washed twice with 2% sodium hydrogen carbonate solution and then with water. After drying over sodium sulfate it was filtered and evaporated. By chromatography on silica gel and recrystallization from n-pentane there was obtained N-formyl-(S)-leucine (S)-1-[[(2S,3S)-3-ethyl-4-oxo-2-oxetanyl]methyl]octadecyl ester of m.p. 60°-61° C.

1. filtrationwas filtered off
2. customthe filtrate was evaporated
3. addition71 μl of formic acid/acetic acid anhydride were added dropwise
4. additionThe mixture was diluted with 5 ml of diethyl ether
5. washwashed twice with 2% sodium hydrogen carbonate solution
6. dry with materialAfter drying over sodium sulfate it
7. filtrationwas filtered
8. customevaporated
9. customBy chromatography on silica gel and recrystallization from n-pentane