Borane → ((S)-4,5-Diamino-pentyl)-carbamic acid benzyl ester
反応式
[CH2:1]([O:8][C:9](=[O:19])[NH:10][CH2:11][CH2:12][CH2:13][C@H:14]([NH2:18])[C:15](=O)[NH2:16])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.B>C1COCC1>[CH2:1]([O:8][C:9](=[O:19])[NH:10][CH2:11][CH2:12][CH2:13][C@H:14]([NH2:18])[CH2:15][NH2:16])[C:2]1[CH:3]=[CH:4][CH:5]=[CH:6][CH:7]=1参加物
4
反応条件
- 温度
- 10 °C
実験手順
((S)-4-Amino-4-carbamoyl-butyl)-carbamic acid benzyl ester (1.87 g, 7.071 mmol) is suspended in dry THF (40 ml) and cooled to 10° C. in an ice bath under nitrogen. Borane (28.3 ml of a 1 M solution in THF, 28.3 mmol) is added. The ice bath is removed and the suspension heated to 70° C. and then left to stir at this temperature for 3 hours. Further borane (28.3 ml of a 1 M solution in THF, 28.3 mmol) is added and then after an hour the same amount of 1M borane in THF is added again. After a final hour at 70° C. the reaction mixture is quenched with MeOH (40 ml). The solvent is reduced in vacuo to approximately 50 ml. This is diluted with 5 M HCl (100 ml) and washed with diethyl ether (3×100 ml). The aqueous phase is basified to pH12 with 2N NaOH and product extracted into EtOAc (3×100 ml). The organic phases are combined, dried over MgSO4 and the solvent evaporated in vacuo to yield the title compound as a colourless oil.