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US3694498A Expired / Lapsed US ⏱️ 0.0 years remaining

Alpha, alpha-dimethyl-beta, beta-dimercapto-n-lower alkyl-(phenyl and substituted phenyl) ethylamines

Assignee: Citizens Bank NA
•
Filing: 1970-09-11
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Granted: 1972-09-26
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Expires: 1990-09-11
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Abstract

Abstract Dimercapto compounds characterized as alpha, alpha-dimethylbeta, beta-dimercapto-N-lower alkyl-(phenyl and substituted phenyl) ethylamines of the structural formula: WHERE R is phenyl and substituted phenyl and R1 is lower alkyl containing one to eight carbon atoms are described. Trithiolane condensation derivatives of the dimercapto compounds (I) prepared by oxidation with the elimination of hydrogen sulfide are also described. The dimercapto compounds (I) are generally prepared by reacting an alpha, alpha-dimethyl-beta-N-lower alkyl imine(phenyl and substituted phenyl) ethylamine of the structural formula: WHERE R and R1 are as in the dimercapto compounds (I) and R2 is a lower alkyl group containing one to eight carbon atoms with hydrogen sulfide in an inert anhydrous polar organic solvent for the imino compounds (III) at temperatures less than the decomposition temperature of the dimercapto compounds (I) and until (I) is formed and precipitates from the reaction mixture. The imino compounds (III) are preferably prepared by reacting a compound of the structural formula: WITH A LOWER ALKYL AMINE (R2-NH2) containing one to eight carbon atoms. The product dimercapto compounds (I) and trithiolanes are particularly useful as antimalarials in mammals.

Inventors

  • 👤 Arthur B Ash
  • 👤 Calvin L Stevens

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-30 07:59
CPC Classifications
C; C07; C07C; C07C323/00; C07C323/23; C07C323/24; C07C323/25

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 9 words
The compound of claim 1 wherein R is 4-chlorophenyl.
Claim 2
Dependent Claim 13 words
The compound of claim 1 wherein R is 4-chlorophenyl and R1 is ethyl.
Claim 3
Dependent Claim 13 words
The compound of claim 1 wherein R is 4-chlorophenyl and R1 is n-butyl.
Claim 4
Dependent Claim 13 words
The compound of claim 1 wherein R is phenyl and R1 is n-butyl.

References Cited (Backward Citations)

FR1354813A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1975-09-26 1976-03-27 1976-09-26 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1979-09-26 1980-03-27 1980-09-26 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1983-09-26 1984-03-27 1984-09-26 $7700.00 Window Closed / Lapsed

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