反应详情

6.70 g of dihydrocinnamaldehyde are dissolved in 20 ml of anhydrous ethanol, and 10 ml of nitromethane and 1 ml of tetramethylguanidine are added, and the mixture is stirred at RT for 1 h. It is concentrated in vacuo, the residue is taken up in 200 ml of ethanol and 5 ml of glacial acetic acid, 10 g of activated Raney nickel are added and the mixture is then hydrogenated at 50° C. and under 25 bar H2 pressure for 5 h. The catalyst is then filtered off, the filtrate is concentrated in vacuo, the residue is taken up in saturated aqueous sodium bicarbonate solution, and non-polar impurities are removed by extraction with diethyl ether. Extraction 3 times with tetrahydrofuran, drying over sodium sulfate, and concentration in vacuo provides 5.75 g of (D,L)-4-phenyl-2-hydroxy-1-butylamine as a colorless oil.

1. concentrationIt is concentrated in vacuo
2. addition5 ml of glacial acetic acid, 10 g of activated Raney nickel are added
3. waitthe mixture is then hydrogenated at 50° C. and under 25 bar H2 pressure for 5 h
4. filtrationThe catalyst is then filtered off
5. concentrationthe filtrate is concentrated in vacuo
6. customnon-polar impurities are removed by extraction with diethyl ether
7. extractionExtraction 3 times with tetrahydrofuran
8. dry with materialdrying over sodium sulfate, and concentration in vacuo