Hydrochloric Acid → (3R)-3-(cyclopentylmethyl)-4-oxo-4-{(5S)-5-[(2-pyridinylamino)carbonyl]-4,5-dihydro-1H-pyrazol-1-yl}butanoic acid, hydrochloride

反応式

[CH:1]1([CH2:6][C@@H:7]([C:16](=[O:31])[N:17]2[C@H:21]([C:22]([NH:24][C:25]3[CH:30]=[CH:29][CH:28]=[CH:27][N:26]=3)=[O:23])[CH2:20][CH:19]=[N:18]2)[CH2:8][C:9]([O:11]C(C)(C)C)=[O:10])[CH2:5][CH2:4][CH2:3][CH2:2]1.[ClH:32].O1CCOCC1>>[ClH:32].[CH:1]1([CH2:6][C@@H:7]([C:16](=[O:31])[N:17]2[C@H:21]([C:22]([NH:24][C:25]3[CH:30]=[CH:29][CH:28]=[CH:27][N:26]=3)=[O:23])[CH2:20][CH:19]=[N:18]2)[CH2:8][C:9]([OH:11])=[O:10])[CH2:5][CH2:4][CH2:3][CH2:2]1

参加物

反応物 3

HCID 313Hydrochloric Acid

HCID 312751,4-Dioxane

HCID 867064101,1-Dimethylethyl (3R)-3-(cyclopentyl methyl)-4-oxo-4-{(5S)-5-[(2-pyridinylamino)carbonyl]-4,5-dihydro-1H-pyrazol-1-yl}butanoate

生成物 1

HCID 131732111(3R)-3-(cyclopentylmethyl)-4-oxo-4-{(5S)-5-[(2-pyridinylamino)carbonyl]-4,5-dihydro-1H-pyrazol-1-yl}butanoic acid, hydrochloride収率 100%

実験手順

To a 500 ml round bottom flask was added 1,1-dimethylethyl (3R)-3-(cyclopentylmethyl)-4-oxo-4-{(5S)-5-[(2-pyridinylamino)carbonyl]-4,5-dihydro-1H-pyrazol-1-yl}butanoate (29.1 g, 58.4 mmol) and 4 M HCl in 1,4-dioxane (240 mL, 960 mmol). The mixture was stirred at room temperature and monitored by LCMS. After 90 min, no starting material remained. The mixture was concentrated to dryness and co-evaporated with dioxane (2×15 mL) to afford the crude (3R)-3-(cyclopentylmethyl)-4-oxo-4-{(5S)-5-[(2-pyridinylamino)carbonyl]-4,5-dihydro-1H-pyrazol-1-yl}butanoic acid, hydrochloride (34.0 g, 58.5 mmol, 100% yield) as a light brown foamy solid that was used directly for the next step. LCMS: [M+H]+: 373.2.