反应详情

In 150 ml of methanol was dissolved 13.5 g of compound (49) and the compound was catalytically reduced for 5 hours in the presence of 10% palladium-carbon. The catalyst was filtered off and the filtrate was concentrated under reduced pressure. The residue thus formed was dissolved in ethyl acetate and extracted thrice each time with an aqueous sodium hydrogen carbonate solution. The extracts were combined with each other and washed once with ethyl acetate. After acidifying the aqueous layer with 1N hydrochloric acid, the desired compound was extracted with ethyl acetate. Thus, 2.0 g of Nα -t-butyloxycarbonyl-Nim -tosyl-L-histidyl-L-proline (50) was obtained as a foamy product. Also, from the organic layer formed after extracting the product with an aqueous sodium hydrogencarbonate solution, 9.1 g of the starting material (49) was recovered.

1. filtrationThe catalyst was filtered off
2. concentrationthe filtrate was concentrated under reduced pressure
3. customThe residue thus formed
4. extractionextracted thrice each time with an aqueous sodium hydrogen carbonate solution
5. washwashed once with ethyl acetate
6. extractionthe desired compound was extracted with ethyl acetate