Hydrochloric Acid → 4-(3-ethoxy-4-hydroxy-5-nitrophenyl)-6-(pyridin-3-yl)-5-(thiophen-3-yl)-3,4-dihydropyrimidin-2(1H)-one

HRID 401085Notes

Reaction equation

HRID 401085 reaction equation
[N:1]1[CH:6]=[CH:5][CH:4]=[C:3]([C:7](=O)[CH2:8][C:9]2[CH:13]=[CH:12][S:11][CH:10]=2)[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].Cl>CCO>[CH2:15]([O:17][C:18]1[CH:19]=[C:20]([CH:21]2[C:8]([C:9]3[CH:13]=[CH:12][S:11][CH:10]=3)=[C:7]([C:3]3[CH:2]=[N:1][CH:6]=[CH:5][CH:4]=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 4

HCID 313Hydrochloric AcidHCID 1176UreaHCID 5848783-Ethoxy-4-hydroxy-5-nitrobenzaldehydeHCID 610560411-(Pyridin-3-yl)-2-(thiophen-3-yl)ethanone2×

Product 1

HCID 668258884-(3-ethoxy-4-hydroxy-5-nitrophenyl)-6-(pyridin-3-yl)-5-(thiophen-3-yl)-3,4-dihydropyrimidin-2(1H)-oneYield 33%

Reagents, catalysts & solvents 1

HCID 702EthanolSolvent

Procedure

A mixture of 1-(pyridin-3-yl)-2-(thiophen-3-yl)ethanone (Intermediate 56) (100 mg, 0.492 mmol), 3-ethoxy-4-hydroxy-5-nitrobenzaldehyde (94 mg, 0.45 mmol), urea (81 mg, 1.34 mmol), concentrated HCl (0.04 mL, 0.45 mmol) in EtOH (5 mL) was refluxed overnight. Then the mixture was evaporated in vacuo and the residue was purified by preparative HPLC to give Compound 116 (65 mg, yield 33%). 1H NMR (DMSO-d6 400 MHz): δ 10.30 (s, 1H), 8.92 (s, 1H), 8.56-8.54 (m, 1H), 8.46-8.44 (m, 1H), 7.77 (d, J=8.0 Hz, 1H), 7.63 (s, 1H), 7.48-7.43 (m, 2H), 7.25-7.22 (m, 2H), 6.94 (s, 1H), 6.35 (d, J=5.2 Hz, 1H), 5.27 (d, J=2.8 Hz, 1H), 4.12-4.04 (m, 2H), 1.35 (t, J=6.8 Hz, 3H); MS (ESI): 438.9 m/z [M+1]+.

Workup

  1. temperaturewas refluxed overnight
  2. customThen the mixture was evaporated in vacuo
  3. customthe residue was purified by preparative HPLC

Sources & evidence

ORD record
ord-a7b8bb16150e48ef801e8e2e3f1fa951
Source dataset
uspto-grants-2014_06
Patent number
US08741915B2

Reaction notes

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