HOAt → {(S)-1-[4-fluoro-2-(pyridin-3-ylamino)phenylcarbamoyl]propyl}carbamic acid tert-butyl ester

HRID 242969Notes

Reaction equation

[F:1][C:2]1[CH:3]=[C:4]([NH:9][C:10]2[CH:11]=[N:12][CH:13]=[CH:14][CH:15]=2)[C:5]([NH2:8])=[CH:6][CH:7]=1.[C:16]([O:20][C:21]([NH:23][C@@H:24]([CH2:28][CH3:29])[C:25](O)=[O:26])=[O:22])([CH3:19])([CH3:18])[CH3:17].C1C=NC2N(O)N=NC=2C=1.Cl.CN(C)CCCN=C=NCC>C(Cl)Cl>[C:16]([O:20][C:21](=[O:22])[NH:23][C@H:24]([C:25](=[O:26])[NH:8][C:5]1[CH:6]=[CH:7][C:2]([F:1])=[CH:3][C:4]=1[NH:9][C:10]1[CH:11]=[N:12][CH:13]=[CH:14][CH:15]=1)[CH2:28][CH3:29])([CH3:17])([CH3:18])[CH3:19]

Participants

Conditions

Temperature: 0 °C

Procedure

To a solution of 4-fluoro-N2-pyridin-3-ylbenzene-1,2-diamine (0.594 g, 2.9 mmol) in DCM (18 mL) at 0° C. were added (S)-2-tertbutoxycarbonylaminobutyric acid (650 mg, 3.2 mmol), HOAt (440 mg, 3.2 mmol) and N-(3-dimethylaminopropyl)-N′-ethylcarbodiimide hydrochloride (610 mg, 3.2 mmol) and the reaction mixture stirred at 0° C. for 2 h. The crude mixture was partitioned between DCM and a saturated aqueous solution of NaHCO3. The organic phase was washed with brine, dried (MgSO4), concentrated in vacuo and the resulting residue purified by column chromatography (Si—PCC, gradient 0-60% EtOAc in cyclohexane) to afford {(S)-1-[4-fluoro-2-(pyridin-3-ylamino)phenylcarbamoyl]propyl}carbamic acid tert-butyl ester (839 mg, 75%). LCMS (Method J): RT 0.69 min [M+H]+ 389.2.

Workup

customThe crude mixture was partitioned between DCM
washThe organic phase was washed with brine
dry with materialdried (MgSO4)
concentrationconcentrated in vacuo
customthe resulting residue purified by column chromatography (Si—PCC, gradient 0-60% EtOAc in cyclohexane)

Sources & evidence

ORD record: ord-8aa39074392a4974b5e288b1405134ea
Source dataset: uspto-grants-2014_02
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08653089B2

Reaction notes

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