3-Pyridinecarboxaldehyde → HCID 65645406, compound

HRID 843277Notes

Reaction equation

HRID 843277 reaction equation
[N:1]1[CH:6]=[CH:5][CH:4]=[C:3](C=O)[CH:2]=1.[Cl:9][C:10]1[C:14](C2C=NC=CC=2)=[N:13][S:12][N:11]=1.[H-].[Na+]>C1COCC1>[Cl:9][C:10]1[C:14]([C:6]2[CH:5]=[CH:4][CH:3]=[CH:2][N:1]=2)=[N:13][S:12][N:11]=1

Participants

5

Reactant 3

HCID 103713-PyridinecarboxaldehydeHCID 24758Sodium hydrideHCID 104881643-Chloro-4-(pyridin-3-yl)-1,2,5-thiadiazole

Product 1

HCID 65645406HCID 65645406, compound

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Procedure

3-(3-chloro-1,2,5-thiadiazol-4-yl-pyridine (compound 1) was synthesized from 3-pyridinecarboxaldehyde following, except with slight modification, from the published procedure as provided in Sauerberg et al, Journal Medicinal Chemistry, 1992, Vol.35, Page 2274. 3-(3-Chloro-1,2,5-thiadiazol-4-yl)pyridine was reacted with a diol (compound 2, wherein n=6, 7, 8, 9, 10 or 12) in the presence of sodium hydride in refluxing THF to yield bis[3-(pyridin-3-yl)-1,2,5-thiadiazol-4-yl]alkyl- diethers (compound 3, wherein n=6, 7, 8, 9, 19 or 12) in 75-90% yield. These diethers were treated with excess methyl iodide in acetone or chloroform to give bis-quaternary ammonium iodides (compound 4, wherein n =6, 7, 8, 9, 10 or 12) in 96-100% yield. The quaternary salts were then treated with 5 equivalents of sodium borohydride in a mixture of methanol and chloroform to yield the compounds 5, wherein n=6, 7, 8, 9, 10 or 12 in 50-60% yield. Dry hydrogen chloride gas was then bubbled through the methanolic solution of compounds 5 at 0° C. to give compounds 6, wherein n=6, 7, 8, 9, 10 or 12 in 95-100% yield.

Workup

  1. customas provided in Sauerberg et al, Journal Medicinal Chemistry, 1992, Vol.35, Page 2274

Sources & evidence

ORD record
ord-51aedc1f44204a35bad0d52816aa072b
Source dataset
uspto-grants-2002_04
Patent number
US06376675B2

Reaction notes

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