反应详情

A mixture of (R)-7-[1-hydroxymeth-(Z)-ylidene]-6-oxo-4,6,7,8-tetrahydro-3H-isoquinoline-2,8a-dicarboxylic acid 2-tert-butyl ester 8a-methyl ester (3.8 g), 4-fluorophenylhydrazine hydrochloride (2.7 g), sodium acetate (1.4 g) and acetic acid (30 mL) was stirred at room temperature for 1 hour. The mixture was concentrated under reduced pressure, and the residue was partitioned between diethyl ether and 2.0 M aqueous hydrochloric acid solution. The organic phase was washed with water, aqueous potassium carbonate solution and brine, and then dried over sodium sulfate. The solvent was removed under reduced pressure, and the residue was triturated with a mixture of cyclohexane and diethyl ether to afford the title compound as a yellow solid (3.7 g). 1H NMR (CDCl3): δ 7.48-7.39 (m, 3H), 7.21-7.12 (m, 2H), 6.45-6.41 (s, 1H), 4.69-4.55 (d, 1H, J=13 Hz), 4.32-3.98 (m, 1H), 3.64 (s, 3H), 3.51-3.33 (m, 1H), 3.00-2.71 (m, 3H), 2.59-2.51 (d, 1H, J=16 Hz), 2.48-2.34 (m, 1H), 1.46 (s, 9H).

1. concentrationThe mixture was concentrated under reduced pressure
2. customthe residue was partitioned between diethyl ether and 2.0 M aqueous hydrochloric acid solution
3. washThe organic phase was washed with water, aqueous potassium carbonate solution and brine
4. dry with materialdried over sodium sulfate
5. customThe solvent was removed under reduced pressure
6. customthe residue was triturated with a mixture of cyclohexane and diethyl ether