Réaction #2061

Équation de réaction

2-[2,4-dichloro-5-(2-propynyloxy)phenyl]-2,4-dihydro-5-(3-butenyl)-3H-1,2,4-triazol-3-one

sodium periodate

→

title product

Rendement 92.2%

2-[2,4-dichloro-5-(2-propynyloxy)phenyl]-2,4-dihydro-5-(3-oxo-propyl)-3H-1,2,4-triazol-3-one

Rendement 92.2%

Solvants

water

tetrahydrofuran

water

Conditions de réaction

Traitement

1. 1
   Extractionextracted with ethyl acetate
2. 2
   SéchageThe organic layer was dried (MgSO4)
3. 3
   Concentrationconcentrated in vacuo
4. 4
   AutreThe crude product was purified by flash chromatography over silica gel
5. 5
   Lavageeluting with a 96:4 v
6. 6
   workup.ADDITIONv mixture of dichloromethane and methanol

Mode opératoire

To a solution of 500 mg (1.48 mmol) of 2-[2,4-dichloro-5-(2-propynyloxy)phenyl]-2,4-dihydro-5-(3-butenyl)-3H-1,2,4-triazol-3-one in a mixture of 10 mL of tetrahydrofuran and 10 mL of water was added 696 mg (3.25 mmol) of sodium periodate and 167 mL of 0.18M aqueous solution of osmium tetroxide at room temperature. The mixture was stirred at the room temperature for 2h, and then diluted with water and extracted with ethyl acetate. The organic layer was dried (MgSO4) and concentrated in vacuo. The crude product was purified by flash chromatography over silica gel, eluting with a 96:4 v:v mixture of dichloromethane and methanol to give 464 mg of the title product of Step 1 as a white foam. 1H NMR (CDCI3, 400 MHz) δ 11.5 (broad s,1H), 9.8 (s,1H), 7.55 (s,1H), 7.2 (s,1H), 4.8 (s,2H), 2.9 (m,4H).

Source