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2,2-Dimethyl-1,3-dioxane-4,6-dione → 4-(3-ethoxy-4-hydroxy-5-nitrophenyl)-6-(pyridin-3-yl)-5-(thiophen-3-yl)-3,4-dihydropyridin-2(1H)-one

HRID 924643
Notes
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Reaction equation

HRID 924643 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].[CH3:30][C:31]1(C)[O:38]C(=O)CC(=O)O1.C([O-])(C)=O.[NH4+:44]>CC(O)=O>[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:44][C:31](=[O:38])[CH2:30]2)[CH:23]=[C:24]([N+:27]([O-:29])=[O:28])[C:25]=1[OH:26])[CH3:16]
ParticipantsProcedureWorkupSources & evidenceReaction notes

Participants

6

Reactant 4

HCID 162492,2-Dimethyl-1,3-dioxane-4,6-dioneHCID 517165Ammonium AcetateHCID 5848783-Ethoxy-4-hydroxy-5-nitrobenzaldehydeHCID 610560411-(Pyridin-3-yl)-2-(thiophen-3-yl)ethanone

Product 1

HCID 566442854-(3-ethoxy-4-hydroxy-5-nitrophenyl)-6-(pyridin-3-yl)-5-(thiophen-3-yl)-3,4-dihydropyridin-2(1H)-oneYield 12%

Reagents, catalysts & solvents 1

HCID 176Acetic AcidSolvent

Procedure

A mixture of 1-(pyridin-3-yl)-2-(thiophen-3-yl)ethanone (Intermediate 1, see Example 18 for synthesic description of all intermediates) (230 mg, 1.1 mmol), 3-ethoxy-4-hydroxy-5-nitrobenzaldehyde (296 mg, 1.4 mmol), meldrum's acid (202 mg, 1.4 mmol) and AcONH4 (108 mg, 1.4 mmol) in AcOH (3 mL) was refluxed under N2 overnight. The mixture was concentrated under reduced pressure and the residue was purified by prep-HPLC (0.1% TFA as additive) to give Compound 2 (60 mg, 12%). 1H NMR (MeOD 400 MHz): δ 8.70 (d, J=5.2 Hz, 1H), 8.67 (s, 1H), 8.30 (d, J=8.0 Hz, 1H), 7.90-7.62 (m, 1H), 7.72-7.60 (m, 1H), 7.27-7.24 (m, 2H), 6.94-6.92 (m, 1H), 6.58 (d, J=4.8 Hz, 1H), 4.20-4.11 (m, 3H), 3.30-3.25 (m, 1H), 2.79-2.74 (dd, J=16.2, 3.2 Hz, 1H), 1.45 (t, J=6.8 Hz, 3H). MS (ESI): m/z 438.3 [M+1]+.

Workup

  1. temperaturewas refluxed under N2 overnight
  2. concentrationThe mixture was concentrated under reduced pressure
  3. customthe residue was purified by prep-HPLC (0.1% TFA as additive)

Sources & evidence

ORD record
ord-76daefcc4a0341bc8cd4ebfac59cbaa1
Source dataset
uspto-grants-2016_03
DOI
10.6084/m9.figshare.5104873.v1
Patent number
US09283213B2

Reaction notes

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On this pageParticipantsProcedureWorkupSources & evidenceReaction notes