反应详情

A solution of N-tert-butoxycarbonylaminoacetaldehyde (0.28 g, 1.76 mmol) in 1,2-dichloroethane (DCE, 5 mL) was added to a solution of [4-(4-aminophenyl)butyl]carbamic acid benzyl ester (0.48 g, 1.6 mmol) in DCE (10 mL) and acetic acid (0.108 mL, 1.6 mmol). The mixture was stirred at room temperature for 20 min. NaB(OAc)3H (0.48 g, 2.26 mmol) was then added into the mixture which was further stirred at room temperature overnight. Water (10 mL) was added and the mixture was acidified to pH 7 by 10% aqueous HCl. The organic fraction was isolated and dried over sodium sulfate. The solvent was removed under reduced pressure and the residue was purified by Flash™ (BIOTAGE, Inc) (90 g silica gel cartridge 40M, ethyl acetate/hexane, 1:2, v/v) to afford the protected diamine 600 (0.33 g, 47%) as a white powder. 1H NMR (300 MHz, CDCl3) δ 1.45 (s, 9H), 1.54 (m, 2H), 2.51 (m, 2), 3.18 (m, 4H), 3.36 (m, 2H), 3.89 (br s, 1H), 4.69 (br s, 1H), 4.78 (br s, 1H), 5.51 (s, 2H), 6.54 (d, 2), 6.96 (d, 2H), 7.33 (m, 5H). m/z (ESI) 442 [C25H35N3O4+H]+.

1. stirringwas further stirred at room temperature overnight
2. customThe organic fraction was isolated
3. dry with materialdried over sodium sulfate
4. customThe solvent was removed under reduced pressure
5. customthe residue was purified by Flash™ (BIOTAGE, Inc) (90 g silica gel cartridge 40M, ethyl acetate/hexane, 1:2