Sodium Hydroxide → 6-[[(4-ethoxy-3,5-dimethyl-2-pyridyl)methyl]thio]-5H-1,3-dioxolo[4,5-f]benzimidazole

HRID 703189Notes

Reaction equation

HRID 703189 reaction equation
[O:1]1[C:13]2[C:4](=[CH:5][C:6]3[NH:10][C:9]([SH:11])=[N:8][C:7]=3[CH:12]=2)[O:3][CH2:2]1.Cl.Cl[CH2:16][C:17]1[C:22]([CH3:23])=[C:21]([O:24][CH2:25][CH3:26])[C:20]([CH3:27])=[CH:19][N:18]=1.[OH-].[Na+]>C(O)C.O>[CH2:25]([O:24][C:21]1[C:20]([CH3:27])=[CH:19][N:18]=[C:17]([CH2:16][S:11][C:9]2[NH:10][C:6]3[CH:5]=[C:4]4[O:3][CH2:2][O:1][C:13]4=[CH:12][C:7]=3[N:8]=2)[C:22]=1[CH3:23])[CH3:26]

Participants

6

Reactant 3

HCID 14798Sodium HydroxideHCID 221514582-Chloromethyl-4-ethoxy-3,5-dimethylpyridine hydrochlorideHCID 178527753HCID 178527753, compound

Product 1

HCID 221514556-[[(4-ethoxy-3,5-dimethyl-2-pyridyl)methyl]thio]-5H-1,3-dioxolo[4,5-f]benzimidazole

Reagents, catalysts & solvents 2

HCID 702EthanolSolventHCID 962WaterSolvent

Procedure

5.82 g of 5H-1,3-dioxolo[4,5-f]benzimidazole-6-thiol were suspended in 200 ml of ethanol and the suspension was treated with 7.1 g of 2-chloromethyl-4-ethoxy-3,5-dimethylpyridine hydrochloride while cooling with ice. Thereafter, a solution of 2.4 g of sodium hydroxide in 100 ml of water was added dropwise thereto, the mixture was left to boil at reflux overnight and subsequently evaporated to dryness in vacuo. The residue was dissolved in 500 ml of methylene chloride. The solution was washed firstly with 250 ml of 1.5N sodium hydroxide solution and then with 3×300 ml of water, dried over sodium sulfate and evaporated in vacuo. The product was purified on 150 g of silica gel using ethyl acetate/methylene choride (1:1) as the elution agent. Crystallization from acetonitrile gave 6-[[(4-ethoxy-3,5-dimethyl-2-pyridyl)methyl]thio]-5H-1,3-dioxolo [4,5-f]benzimidazole of melting point 184°-185°.

Workup

  1. temperaturewhile cooling with ice
  2. waitthe mixture was left
  3. temperatureat reflux overnight
  4. customsubsequently evaporated to dryness in vacuo
  5. dissolutionThe residue was dissolved in 500 ml of methylene chloride
  6. washThe solution was washed firstly with 250 ml of 1.5N sodium hydroxide solution
  7. dry with materialwith 3×300 ml of water, dried over sodium sulfate
  8. customevaporated in vacuo
  9. customThe product was purified on 150 g of silica gel
  10. customCrystallization from acetonitrile

Sources & evidence

ORD record
ord-8abeaf3df0cc4541b0916bf7d3923468
Source dataset
uspto-grants-1991_01
Patent number
US04981861

Reaction notes

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