4-(4-Bromo-2-cyclopropyl-1-((2-(trimethylsilyl)ethoxy)methyl)-1H-imidazol-5-yl)-2-chloro-4,5-dihydropyrimidine → 4-(4-bromo-2-cyclopropyl-1-((2-(trimethylsilyl)ethoxy) methyl)-1H-imidazol-5-yl)-2-chloropyrimidine

HRID 885738Notes

Reaction equation

HRID 885738 reaction equation
[Br:1][C:2]1[N:3]=[C:4]([CH:22]2[CH2:24][CH2:23]2)[N:5]([CH2:14][O:15][CH2:16][CH2:17][Si:18]([CH3:21])([CH3:20])[CH3:19])[C:6]=1[CH:7]1[CH2:12][CH:11]=[N:10][C:9]([Cl:13])=[N:8]1>CCOC(C)=O.[O-2].[O-2].[Mn+4]>[Br:1][C:2]1[N:3]=[C:4]([CH:22]2[CH2:24][CH2:23]2)[N:5]([CH2:14][O:15][CH2:16][CH2:17][Si:18]([CH3:19])([CH3:20])[CH3:21])[C:6]=1[C:7]1[CH:12]=[CH:11][N:10]=[C:9]([Cl:13])[N:8]=1

Participants

4

Reactant 1

HCID 670534874-(4-Bromo-2-cyclopropyl-1-((2-(trimethylsilyl)ethoxy)methyl)-1H-imidazol-5-yl)-2-chloro-4,5-dihydropyrimidine

Product 1

HCID 866514084-(4-bromo-2-cyclopropyl-1-((2-(trimethylsilyl)ethoxy) methyl)-1H-imidazol-5-yl)-2-chloropyrimidineYield 83%

Reagents, catalysts & solvents 2

HCID 178418406HCID 178418406, compoundCatalystHCID 8857Ethyl AcetateSolvent

Procedure

4-(4-Bromo-2-cyclopropyl-1-((2-(trimethylsilyl)ethoxy)methyl)-1H-imidazol-5-yl)-2-chloro-4,5-dihydropyrimidine (21.65 g, 50.1 mmol) and manganese dioxide (43.6 g, 501 mmol) in EtOAc (240 mL) was heated at reflux for 2.5 hours. The reaction mixture was cooled to room temperature and filtered through Celite. The filtrates were concentrated and the residue purified by flash column chromatography (10-40% EtOAc in heptane) to afford 4-(4-bromo-2-cyclopropyl-1-((2-(trimethylsilyl)ethoxy)methyl)-1H-imidazol-5-yl)-2-chloropyrimidine as a yellow oil (17.8 g, 41.4 mmol, 83%). LCMS(m/z) 429.0 (MH+), tR=1.24 minutes; 1H NMR (400 MHz, CDCl3) δ-0.06 (s, 9H), 0.82-0.90 (m, 2H), 1.04-1.11 (m, 2H), 1.14-1.20 (m, 2H), 2.06 (m, 1H), 3.55-3.62 (m, 2H), 5.92 (s, 2H), 7.92 (d, J=5.5 Hz, 1H), 8.62 (d, J=5.5 Hz, 1H).

Workup

  1. temperatureat reflux for 2.5 hours
  2. filtrationfiltered through Celite
  3. concentrationThe filtrates were concentrated
  4. customthe residue purified by flash column chromatography (10-40% EtOAc in heptane)

Sources & evidence

ORD record
ord-6c81c0b22f18492cab0339d487b75024
Source dataset
uspto-grants-2012_08
Patent number
US08242260B2

Reaction notes

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