Trifluoroacetic acid → HCID 22592920, compound

To a solution of methyl 2(R/S)-(tert-butoxycarbonyl)amino-3,3-dimethyl-4-pentenoate (4.97 g, 19.3 mmol) in 50 mL of dichloromethane at 0° C. was added 16.5 mL of trifluoroacetic acid. After 2 hours, the solution was concentrated and the residue was dissolved in 100 mL of dichloromethane and washed with sat. aq. sodium bicarbonate (50 mL). The organic layer was dried over sodium sulfate and concentrated to give methyl 2(R/S)-amino-3,3-dimethyl-4-pentenoate (2.30 g), which was dissolved in 50 mL of dichloromethane and cooled to 0° C. Triethylamine (8.1 mL, 58 mmol) was added, followed by addition of 4-(4-fluorophenoxy)benzenesulfonyl chloride (6.71 g, 21.3 mmol). The reaction was allowed to warm to room temperature and stirred for 18 hours and then washed 3 N hydrochloric acid (125 mL), dried over sodium sulfate and concentrated. The residue was purified by chromatography on silica gel, eluting with 20% ethyl acetate in hexane, to yield 4.41 g (61%) of methyl 2(R/S)-[4-(4-fluorophenoxy)benzenesulfonyl]amino-3,3-dimethyl-4-pentenoate as a white solid.

1. concentrationthe solution was concentrated
2. dissolutionthe residue was dissolved in 100 mL of dichloromethane
3. washwashed with sat. aq. sodium bicarbonate (50 mL)
4. dry with materialThe organic layer was dried over sodium sulfate
5. concentrationconcentrated

ORD record

ord-7e7208ec142b42869b0b548266363f30

Source dataset

uspto-grants-2000_11

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06153757