3-(dimethylamino)propyl 2-(4-((1E,4E)-2-(tert-butoxycarbonylamino)-4-((3-(tert-butyldimethylsilyloxy)propyl)(propyl)carbamoyl)-3H-benzo[b]azepin-8-yl)phenyl)acetate → 3-(dimethylamino)propyl 2-(4-((1E,4E)-2-amino-4-((3-hydroxypropyl)(propyl)carbamoyl)-3H-benzo[b]azepin-8-yl)phenyl)acetate

Participants

Reaction Steps

3-(dimethylamino)propyl 2-(4-((1E,4E)-2-(tert-butoxycarbonylamino)-4-((3-(tert-butyldimethylsilyloxy)propyl)(propyl)carbamoyl)-3H-benzo[b]azepin-8-yl)phenyl)acetate was dissolved in 2 mls of dichloromethane and 0.5 ml of TFA. After about one hour, the mixture was concentrated under reduced pressure and the resulting residue was then re-dissolved in dichloromethane and 1 ml of concentrated ammonium hydroxide added and the mixture vigorously stirred for 15 minutes. This mixture was then diluted with water, extracted with dichloromethane (2×), extracts dried over sodium sulfate and concentrated under reduced pressure. Preparative thin layer chromatography (2×0.5 mm plates, 10% MeOH/DCM/0.5% NH4OH) afforded 3-(dimethylamino)propyl 2-(4-((1E,4E)-2-amino-4-((3-hydroxypropyl)(propyl)carbamoyl)-3H-benzo[b]azepin-8-yl)phenyl)acetate. 1H NMR (400 MHz, CDCl3) δ 7.57-7.65 (m, 2H), 7.46-7.51 (m, 1H), 7.28-7.40 (m, 4H), 6.87 (s, 2H), 4.07-4.21 (m, 2H), 3.56-3.71 (m, 6H), 3.40-3.54 (m, 2H), 2.82 (s, 2H), 2.26-2.36 (m, 2H), 2.20 (s, 6H), 1.59-1.87 (m, 6H), 0.86-0.99 (m, 3H); m/z (APCI-pos) M+1=521.3.

Provenance & Evidence