Urea → HCID 51347329, compound

HRID 401131Notes

Reaction equation

HRID 401131 reaction equation
[C:1]1([CH2:7][C:8]([C@H:10]2[CH2:14][CH2:13][CH2:12][O:11]2)=O)[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1.[CH2:15]([O:17][C:18]1[CH:19]=[C:20]([CH:23]=[C:24]([N+:27]([O-:29])=[O:28])[C:25]=1[OH:26])[CH:21]=O)[CH3:16].[NH2:30][C:31]([NH2:33])=[O:32]>C(O)C.Cl>[CH2:15]([O:17][C:18]1[CH:19]=[C:20]([CH:21]2[C:7]([C:1]3[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=3)=[C:8]([C@H:10]3[CH2:14][CH2:13][CH2:12][O:11]3)[NH:33][C:31](=[O:32])[NH:30]2)[CH:23]=[C:24]([N+:27]([O-:29])=[O:28])[C:25]=1[OH:26])[CH3:16]

Participants

6

Reactant 3

HCID 1176UreaHCID 5848783-Ethoxy-4-hydroxy-5-nitrobenzaldehydeHCID 67060952HCID 67060952, compound2×

Product 1

HCID 51347329HCID 51347329, compoundYield 5%

Reagents, catalysts & solvents 2

HCID 313Hydrochloric AcidCatalystHCID 702EthanolSolvent

Procedure

To a mixture of (R)-2-phenyl-1-(tetrahydrofuran-2-yl)ethanone (Intermediate 94) (200 mg, 1.0 mmol), 3-ethoxy-4-hydroxy-5-nitrobenzaldehyde (266 mg, 1.3 mmol), and urea (189 mg, 3.2 mmol) in absolute ethanol (3 mL) was added conc. HCl (one drop). The mixture was refluxed under N2 for 3.5 hrs. The reaction mixture was concentrated under reduced pressure and purified by silica gel column chromatography (PE:EtOAc=10:1 to PE:EtOAc=1:2) and prep-HPLC (0.1% TFA as additive) to give Compound 176 (21 mg, yield 5%). 1H NMR (DMSO 400 MHz): δ 10.18 (s, 1H), 8.34 (s, 1H), 7.64 (s, 1H), 7.34-7.27 (m, 5H), 7.16-7.10 (m, 1H), 7.07-7.04 (m, 1H), 5.38 (s, 1H), 4.26-4.21 (m, 1H), 4.03-3.92 (m, 3H), 3.92-3.87 (m, 1H), 2.22-2.18 (m, 1H), 2.17-2.04 (m, 2H), 2.00-1.95 (m, 1H), 1.32-1.22 (m, 3H); MS (ESI): m/z 426.0 [M+1]+.

Workup

  1. temperatureThe mixture was refluxed under N2 for 3.5 hrs
  2. concentrationThe reaction mixture was concentrated under reduced pressure
  3. custompurified by silica gel column chromatography (PE:EtOAc=10:1 to PE:EtOAc=1:2) and prep-HPLC (0.1% TFA as additive)

Sources & evidence

ORD record
ord-a1159773d1ce4583a06a8a57a2fc8388
Source dataset
uspto-grants-2014_06
Patent number
US08741915B2

Reaction notes

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