Sodium Hydroxide → 1,8-Dihydro-2-[[(5-methyl-2-pyridyl)methyl]thio]-m-dioxino(4,5-f)benzimidazole dihydrochloride

HRID 1583796Notes

Reaction equation

HRID 1583796 reaction equation
[NH:1]1[C:5]2[CH:6]=[C:7]3[CH2:13][O:12][CH2:11][O:10][C:8]3=[CH:9][C:4]=2[N:3]=[C:2]1[SH:14].[OH-].[Na+].[ClH:17].[CH3:18][C:19]1[CH:20]=[CH:21][C:22]([CH2:25][Cl:26])=[N:23][CH:24]=1>O>[ClH:26].[ClH:17].[CH3:18][C:19]1[CH:20]=[CH:21][C:22]([CH2:25][S:14][C:2]2[NH:1][C:5]3[CH:6]=[C:7]4[CH2:13][O:12][CH2:11][O:10][C:8]4=[CH:9][C:4]=3[N:3]=2)=[N:23][CH:24]=1

Participants

5

Reactant 3

HCID 14798Sodium HydroxideHCID 233137952-(Chloromethyl)-5-methylpyridine hydrochlorideHCID 178527751HCID 178527751, compound

Product 1

HCID 704548491,8-Dihydro-2-[[(5-methyl-2-pyridyl)methyl]thio]-m-dioxino(4,5-f)benzimidazole dihydrochloride

Reagents, catalysts & solvents 1

HCID 962WaterSolvent

Procedure

To 3.7 g of 1,8-dihydro-m-dioxino(4,5-f)benzimidazole-2-thiol, suspended in 60 ml of alcohol, were added dropwise while stirring 1.5 g of sodium hydroxide in 30 ml of water and, after 30 minutes, there were added 3.4 g of 5-methyl-2-chloromethylpyridine hydrochloride. The mixture was left to boil at reflux overnight, then evaporated and the residue was taken up in methylene chloride. This mixture was washed first with 3N sodium hydroxide, then neutral with water, dried over sodium sulfate and evaporated in vacuo. The crude product was dissolved while heating in a small amount of methanol and treated with 25 ml of 5N hydrochloric acid in ethylacetate. There was obtained 1,8-dihydro-2-[[(5-methyl-2-pyridyl)methyl]thio]-m-dioxino(4,5-f)benzimidazole dihydrochloride of melting point 153°-155° C.

Workup

  1. additionwere added dropwise
  2. waitThe mixture was left
  3. temperatureat reflux overnight
  4. customevaporated
  5. washThis mixture was washed first with 3N sodium hydroxide
  6. dry with materialneutral with water, dried over sodium sulfate
  7. customevaporated in vacuo
  8. dissolutionThe crude product was dissolved
  9. temperaturewhile heating in a small amount of methanol
  10. additiontreated with 25 ml of 5N hydrochloric acid in ethylacetate

Sources & evidence

ORD record
ord-330a53ed30c344acb32433e3c510f013
Source dataset
uspto-grants-1985_11
Patent number
US04554280

Reaction notes

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