Sodium t-butoxide → Tert-butyl 3-(2-fluoro-4-(methylsulfonyl)phenylamino)-2-oxo-1,4'-bipiperidine-1'-carboxylate

HRID 407935Notes

Reaction equation

[NH2:1][C@H:2]1[CH2:7][CH2:6][CH2:5][N:4]([CH:8]2[CH2:13][CH2:12][N:11]([C:14]([O:16][C:17]([CH3:20])([CH3:19])[CH3:18])=[O:15])[CH2:10][CH2:9]2)[C:3]1=[O:21].Br[C:23]1[CH:28]=[CH:27][C:26]([S:29]([CH3:32])(=[O:31])=[O:30])=[CH:25][C:24]=1[F:33].CC([O-])(C)C.[Na+]>C1(C)C=CC=CC=1.C1C=CC(/C=C/C(/C=C/C2C=CC=CC=2)=O)=CC=1.C1C=CC(/C=C/C(/C=C/C2C=CC=CC=2)=O)=CC=1.C1C=CC(/C=C/C(/C=C/C2C=CC=CC=2)=O)=CC=1.[Pd].[Pd].C1(P(C2C=CC=CC=2)C2C=CC3C(=CC=CC=3)C=2C2C3C(=CC=CC=3)C=CC=2P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1>[F:33][C:24]1[CH:25]=[C:26]([S:29]([CH3:32])(=[O:31])=[O:30])[CH:27]=[CH:28][C:23]=1[NH:1][CH:2]1[CH2:7][CH2:6][CH2:5][N:4]([CH:8]2[CH2:9][CH2:10][N:11]([C:14]([O:16][C:17]([CH3:18])([CH3:20])[CH3:19])=[O:15])[CH2:12][CH2:13]2)[C:3]1=[O:21]

Participants

Conditions

Temperature: 80 °C

Procedure

(S)-tert-Butyl 3-amino-2-oxo-1,4′-bipiperidine-1′-carboxylate (Example 39, Steps A-C, 5.0 g, 17 mmol), 2,2′-bis(diphenylphosphino)-1,1′-binaphthyl (1.0 g, 1.7 mmol), 1-bromo-2-fluoro-4-(methylsulfonyl)benzene (6.4 g, 25 mmol) and NaOtBu (1.9 g, 20 mmol) were dissolved in degassed toluene (100 mL). Pd2 dba3 (0.77 g, 0.84 mmol) was added and the reaction heated in an 80° C. oil bath for 5 hours. The reaction was concentrated and purified over silica gel (50-100% EtOAc in hexanes followed by 5% ammoniated methanol in CH2Cl2) to afford tert-butyl 3-(2-fluoro-4-(methylsulfonyl)phenylamino)-2-oxo-1,4′-bipiperidine-1′-carboxylate (8.4 g, 18 mmol, 106% yield) as yellow solid.

Workup

concentrationThe reaction was concentrated
custompurified over silica gel (50-100% EtOAc in hexanes followed by 5% ammoniated methanol in CH2Cl2)

Sources & evidence

ORD record: ord-4179f3243d2248b9a0443f98bb7f97a1
Source dataset: uspto-grants-2014_06
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08754226B2

Reaction notes

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