反应详情

To a mixture of 3′-fluoro-4′-{[4-(trans-4-hydroxycyclohexyl)-5-oxo-7-propyl-4,5-dihydro[1,2,4]triazolo[1,5-a]pyrimidin-6-yl]methyl}biphenyl-2-carbonitrile (233 g), tert-butyl 2-bromopropanoate (301 g), toluene (1.7 L) and 50% sodium hydroxide (1.7 L) was added tetrabutylammonium hydrogen sulfate (16.3 g), and the mixture was stirred with the internal temperature maintained below 30° C. for 16 hr. Water (1 L) was slowly added under ice-cooling, and phases were separated. The aqueous layer was extracted with tetrahydrofuran (1.0 L). The combined extracts were successively washed with 3M hydrochloric acid (1 L) and brine (1 L), dried over anhydrous magnesium sulfate, and concentrated. The residue was purified by silica gel column chromatography to give the title compound as an amorphous pale-yellow solid (283 g, 96%).

1. temperaturemaintained below 30° C. for 16 hr
2. temperaturecooling
3. customphases were separated
4. extractionThe aqueous layer was extracted with tetrahydrofuran (1.0 L)
5. washThe combined extracts were successively washed with 3M hydrochloric acid (1 L) and brine (1 L)
6. dry with materialdried over anhydrous magnesium sulfate
7. concentrationconcentrated
8. customThe residue was purified by silica gel column chromatography