反应详情

Concentrated HCl (12M, one drop) is added at 0° C. to a mixture containing (±)-1-[3-(benzhydrylidene-amino)-4-cyano-benzyl]-4-(6-chloro-benzo[b]thiophene-2-sulfonyl)-6-oxo-piperazine-2-carboxylic acid methyl ester (60 mg, 0.08 mmol) in MeOH (5 mL). Added THF (2 mL) followed by a second drop of 12M HCl and warmed reaction mixture to ambient temperature. The reaction is quenched by pouring the reaction mixture onto a 1:1 mixture of CH2Cl2/aqueous NaHCO3 and the layers are separated. The aqueous phase is washed with CH2Cl2 and then the combined organic phase is washed with brine, dried over anhydrous MgSO4, filtered and concentrated. The crude residue is chromatographed on silica gel (CH2Cl2 to 4% MeOH/CH2Cl2) to provide 42 mg (93%) of the title compound. 1H NMR (300 MHz, CDCl3) δ2.98 (dd, J=12.5, 3.5 Hz, 1H), 3.60 (d, J=16.8 Hz, 1H), 3.69 (d, J=15.3 Hz, 1H), 3.79 (s, 3H), 3.98 (m, 1H), 4.21-4.31 (m, 2H), 4.44 (br s, 2H), 5.36 (d, J=15.3 Hz, 1H), 6.47 (dd, J=8.0, 1.4 Hz, 1H), 6.54 (s, 1H), 7.26 (d, J=8.0 Hz, 1H), 7.45 (dd, J=8.5, 1.8 Hz, 1H), 7.80-7.86 (m, 3H) ppm; MS (ISP loop): m/z 519 (M+H).

1. temperaturewarmed
2. customreaction mixture to ambient temperature
3. customThe reaction is quenched
4. additionby pouring the reaction mixture
5. additiononto a 1:1 mixture of CH2Cl2/aqueous NaHCO3
6. customthe layers are separated
7. washThe aqueous phase is washed with CH2Cl2
8. washthe combined organic phase is washed with brine
9. dry with materialdried over anhydrous MgSO4
10. filtrationfiltered
11. concentrationconcentrated
12. customThe crude residue is chromatographed on silica gel (CH2Cl2 to 4% MeOH/CH2Cl2)