反应详情

温度

23 °C

To a solution of (1aR,5aR)-2-(2,4-difluoro-phenyl)-1a,2,5,5a-tetrahydro-1H-2,3-diaza-cyclopropa[a]pentalene-4-carboxylic acid ethyl ester (17.4 g, 57.2 mmol) in methanol (100 mL) and THF (100 mL) was added a 2.0 M aqueous solution of sodium hydroxide (86 mL, 172 mmol). The resulting orange solution was stirred at 23° C. for 3 h. The organic solvents were removed under reduced pressure. The remaining aqueous solution was diluted to 150 mL with water and then acidified to pH 2 by addition of 6 M HCl while stirring vigorously. The precipitate was collected by filtration, rinsed with water, and then dried under reduced pressure to give the title compound as a tan solid (15.62 g). LCMS m/z=277.3 [M+H]+; 1H NMR (400 MHz, DMSO-d6) δ ppm 0.41 (td, J=4.6, 3.4 Hz, 1H), 1.15 (td, J=7.8, 4.7 Hz, 1H), 2.16-2.21 (m, 1H), 2.23-2.29 (m, 1H), 2.76 (d, J=16.2 Hz, 1H), 2.90 (dd, J=16.4, 6.2 Hz, 1H), 7.27-7.32 (m, 1H), 7.56-7.62 (m, 1H), 7.75 (td, J=9.0, 5.9 Hz, 1H), 12.93 (bs, 1H).

1. customThe organic solvents were removed under reduced pressure
2. additionThe remaining aqueous solution was diluted to 150 mL with water
3. additionacidified to pH 2 by addition of 6 M HCl
4. stirringwhile stirring vigorously
5. filtrationThe precipitate was collected by filtration
6. washrinsed with water
7. customdried under reduced pressure