反应详情

To a stirred suspension of 1-(4-amino-3-fluoro-phenyl)-1H-pyridin-2-one (296 mg; CAS 536747-52-1, prepared according to C. F. Bigge et al., patent application WO 2003045912) at r.t. in dioxane (3 ml) under an argon atmosphere was added carefully trimethyl aluminium solution (0.72 ml; 2M in heptane). After stirring for 2 hrs at r.t., a solution of (1R,3S,4S)-3-[(5-chloro-thiophene-2-carbonyl)-amino]-4-hydroxy-cyclopentane-carboxylic acid methyl ester (110 mg) in dioxane (3 ml) was added. The mixture was heated to 100° C. and stirring at that temperature was continued for 24 h. The mixture was cooled to r.t. and water (0.8 ml) was added. After 15 min stirring, MgSO4 was added and stirring was continued for another 15 min. The solids were filtered off and washed with dichloromethane. The filtrate was concentrated. The crude product was isolated by column chromatography (silica gel; gradient: CH2Cl2→CH2Cl2/MeOH 9:1) to give 5-chloro-thiophene-2-carboxylic acid {(1S,2S,4R)-4-[2-fluoro-4-(2-oxo-2H-pyridin-1-yl)-phenylcarbamoyl]-2-hydroxy-cyclopentyl}-amide (81 mg) as light yellow solid. MS: 476.0 ([M+H]+).

1. temperatureThe mixture was heated to 100° C.
2. stirringstirring at that temperature
3. waitwas continued for 24 h
4. temperatureThe mixture was cooled to r.t.
5. stirringAfter 15 min stirring
6. stirringstirring
7. waitwas continued for another 15 min
8. filtrationThe solids were filtered off
9. washwashed with dichloromethane
10. concentrationThe filtrate was concentrated
11. customThe crude product was isolated by column chromatography (silica gel; gradient: CH2Cl2→CH2Cl2/MeOH 9:1)