Hydrochloric Acid → HCID 66929481, compound

Participants

Reaction Steps

A 200-mL round-bottom flask equipped with T-bore stopcock connected to a balloon with hydrogen was charged with 4 (4.44 g, 11.5 mmol) and THF (40 mL), and a mixture was stirred to dissolve a substrate. Methanol (22 mL), solution of HCl in methanol (1M, 22 mL) and palladium, 10 wt % on activated carbon (532 mg, 12 wt %) were added to the flask, the system was evacuated and stirred under atmosphere of hydrogen for 2 hours. TLC indicated completion of reaction (Hexane/EtOAc, 2:1, developed two times). Catalyst was filtered out and washed with methanol (15 mL×3). Filtrate was diluted with 2-propanol (20 mL) and concentrated under reduced pressure to ˜20 mL volume. A resulted suspension was diluted with EtOAc (20 mL), a solid was filtered out, washed with EtOAc (20×2) and dried to give crude amine hydrochloride 5 as a yellow solid, 3.3 g (80%), LC purity 97.1%. The solid was refluxed in ethanol (50 mL) for 15 min to dissolve colored impurities. A cooled suspension was filtered out, washed with EtOAc (20×2) and vacuum-dried to obtain a creamy-colored solid, 2.9 g (70%), LC purity 99.1%.

Provenance & Evidence