反应详情

A cooled (0° C.) solution of ((S)-2-{(S)-3-[(R)-1-(7-bromo-quinolin-2-yl)-ethylcarbamoyl]-tetrahydro-pyridazin-1-yl}-1-methyl-2-oxo-ethyl)-carbamic acid tert-butyl ester (432.0 mg, 0.808 mmol) in dichloromethane (30 mL) was treated with a solution of hydrochloric acid (2.4 mL, 9.699 mmol, 4 M in 1,4-dioxane). After stirring for 2 h at room temperature the volatiles were removed in vacuo. Residual water was azeotroped off with toluene to provide a white solid that was combined with (S)-2-[2-(2-hydroxy-ethyl)-2-methyl-but-3-enoylamino]-3-methyl-butyric acid (196.6 mg, 0.808 mmol) and anhydrous acetonitrile (30 mL). This mixture was cooled to 0° C. and subsequently treated with N,N-diisopropylethylamine (0.71 mL, 4.04 mmol) and 1-[bis(dimethylamino)methylene]-1H-1,2,3-triazolo[4,5-b]pyridinium 3-oxide hexafluorophosphate (430.1 mg, 1.131 mmol). The reaction was slowly warmed to room temperature. After stirring at room temperature for 20 h, the volatiles were removed in vacuo and the residue was purified by silica gel chromatography using a 50 g Isolute cartridge eluted with a continuous gradient of iso-hexanes/acetone 1:0 to 1:1 to afford the title compound (186.4 mg, 35%) as a yellow foam and as a 1:1 mixture of diastereoisomers. LCMS (m/z) 659.2, 661.1 [M+H], Tr=2.21 min.

1. customwere removed in vacuo
2. customResidual water was azeotroped off with toluene
3. customto provide a white solid
4. temperatureThis mixture was cooled to 0° C.
5. temperatureThe reaction was slowly warmed to room temperature
6. stirringAfter stirring at room temperature for 20 h
7. customthe volatiles were removed in vacuo
8. customthe residue was purified by silica gel chromatography
9. washeluted with a continuous gradient of iso-hexanes/acetone 1:0 to 1:1