Cesium carbonate → 5-(1-((2-chloropyridin-4-yl)methyl)-5-methyl-1H-1,2,4-triazol-3-yl)-3-(4-(trifluoromethoxy)phenyl)-1,2,4-oxadiazole

HRID 1475209Notes

Reaction equation

HRID 1475209 reaction equation
[CH3:1][C:2]1[NH:6][N:5]=[C:4]([C:7]2[O:11][N:10]=[C:9]([C:12]3[CH:17]=[CH:16][C:15]([O:18][C:19]([F:22])([F:21])[F:20])=[CH:14][CH:13]=3)[N:8]=2)[N:3]=1.C([O-])([O-])=O.[Cs+].[Cs+].[Cl:29][C:30]1[CH:35]=[C:34]([CH2:36]Cl)[CH:33]=[CH:32][N:31]=1>CN(C=O)C>[Cl:29][C:30]1[CH:35]=[C:34]([CH2:36][N:6]2[C:2]([CH3:1])=[N:3][C:4]([C:7]3[O:11][N:10]=[C:9]([C:12]4[CH:13]=[CH:14][C:15]([O:18][C:19]([F:22])([F:20])[F:21])=[CH:16][CH:17]=4)[N:8]=3)=[N:5]2)[CH:33]=[CH:32][N:31]=1

Participants

5

Reactant 3

HCID 10796Cesium carbonateHCID 111265732-Chloro-4-(chloromethyl)pyridineHCID 867118775-(5-methyl-1H-1,2,4-triazol-3-yl)-3-[4-(trifluoromethoxy)phenyl]-1,2,4-oxadiazole

Product 1

HCID 867119025-(1-((2-chloropyridin-4-yl)methyl)-5-methyl-1H-1,2,4-triazol-3-yl)-3-(4-(trifluoromethoxy)phenyl)-1,2,4-oxadiazoleYield 60%

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Procedure

5-(5-methyl-1H-1,2,4-triazol-3-yl)-3-(4-(trifluoromethoxy)phenyl)-1,2,4-oxadiazole (500 mg, 1.61 mmol) was placed in DMF (20 mL) and Cs2CO3 (627 mg, 1.93 mmol) was added. The reaction was stirred for 5 min and 2-chloro-4-(chloromethyl)pyridine (312 mg, 1.93 mmol) was added. The reaction was stirred at 45° C. overnight and was then partitioned between H2O (50 mL) and EtOAc (50 mL). The organic layer was separated, washed with H2O (2×50 mL) and brine (30 mL), dried over Na2SO4, filtered, and concentrated to afford the crude product which was purified by silica gel chromatography (EtOAc/Hexane 10%-100% EtOAc) to afford 5-(1-((2-chloropyridin-4-yl)methyl)-5-methyl-1H-1,2,4-triazol-3-yl)-3-(4-(trifluoromethoxy)phenyl)-1,2,4-oxadiazole as a yellow solid (420 mg, 60%). MS (ES+) C18H12ClF3N6O2 requires: 436. found 437 [M+H]+; 1H NMR (600 MHz, CDCl3) δ 8.42 (d, J=5.1 Hz, 1H), 8.28 (d, J=8.6 Hz, 2H), 7.34 (d, J=8.6 Hz, 2H), 7.16 (s, 1H), 7.05 (d, J=5.1 Hz, 1H), 5.46 (s, 2H), 2.58 (s, 3H).

Workup

  1. stirringThe reaction was stirred at 45° C. overnight
  2. customwas then partitioned between H2O (50 mL) and EtOAc (50 mL)
  3. customThe organic layer was separated
  4. washwashed with H2O (2×50 mL) and brine (30 mL)
  5. dry with materialdried over Na2SO4
  6. filtrationfiltered
  7. concentrationconcentrated
  8. customto afford the crude product which
  9. customwas purified by silica gel chromatography (EtOAc/Hexane 10%-100% EtOAc)

Sources & evidence

ORD record
ord-18b1b3ceb6de46a0aa5952df13485b8f
Source dataset
uspto-grants-2015_04
Patent number
US09018380B2

Reaction notes

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