Patent US4049669A successfully refreshed from Google Patents.
US4049669A
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US
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Process for preparing 5-(alkoxy- and aminoethyl thio)methylthiazole compounds
Assignee: GlaxoSmithKline LLC
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Filing: 1975-10-29
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Granted: 1977-09-20
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Expires: 1995-10-29
Abstract
Abstract A process for preparing 5-(alkoxy- and aminoethylthio)methylthiazole compounds via displacement of the trisubstituted phosphonium group from 5-(trisubstituted phosphonium)methylthiazole compounds is disclosed.
Inventors
- 👤 Bing Lun Lam
- 👤 Joseph James Lewis
- 👤 Robert Lee Webb
- 👤 George Robert Wellman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:10
CPC Classifications
C; C07; C07D; C07D277/00; C07D277/02; C07D277/20; C07D277/32; C07D277/38; C07D277/40
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
93 words
A process for preparing a compound of the formula: ##STR3## in which: R 1 is hydrogen or lower alkyl; and R 2 is methoxy, ethoxy, n-propoxy, n-butoxy, i-butoxy, t-butoxy or --SCH 2 CH 2 NH 2 ; comprising reacting a compound of the formula: ##STR4## in which: R 1 is defined as above; R 3 is lower alkyl or phenyl; and X is halo, with a compound of the formula R 2 --H where R 2 is defined as above in an polar organic solvent and in the presence of a strong base.
Claim 2
Dependent Claim
93 words
A process for preparing a compound of the formula: ##STR3## in which: R 1 is hydrogen or lower alkyl; and R 2 is methoxy, ethoxy, n-propoxy, n-butoxy, i-butoxy, t-butoxy or --SCH 2 CH 2 NH 2 ; comprising reacting a compound of the formula: ##STR4## in which: R 1 is defined as above; R 3 is lower alkyl or phenyl; and X is halo, with a compound of the formula R 2 --H where R 2 is defined as above in an polar organic solvent and in the presence of a strong base.
Claim 3
Dependent Claim
12 words
A process according to claim 1 in which R 3 is phenyl.
Claim 4
Dependent Claim
12 words
A process according to claim 2 in which R 2 is methoxy.
Claim 5
Dependent Claim
18 words
A process according to claim 2 in which R 2 is --SCH 2 CH 2 NH 2 .
Claim 6
Dependent Claim
9 words
A process according to claim 3 for preparing 2-amino-5-methoxymethyl-4-methylthiazole.
Claim 7
Dependent Claim
9 words
A process according to claim 4 for preparing 2-amino-5-(2-aminoethyl)thiomethyl-4-methylthiazole.
Claim 8
Dependent Claim
16 words
A process according to claim 1 in which the base is sodium methoxide or sodium hydride.
Claim 9
Dependent Claim
20 words
A process according to claim 1 in which the solvent is methanol, ethanol, propanol, butanol, acetone, acetonitrile, dimethylformamide or dimethylsulfoxide.
Claim 10
Dependent Claim
33 words
A process according to claim 1 in which the reaction is carried out at a temperature of from about 25° to about 200° C. for from about 20 minutes to about 24 hours
Claim 11
Dependent Claim
33 words
A process according to claim 9 in which the reaction is carried out at a temperature of from about 50° to about 100° C. for from about 20 minutes to about 3 hours.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-09-19 | 1981-03-21 | 1981-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-19 | 1985-03-21 | 1985-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-19 | 1989-03-21 | 1989-09-20 | $7700.00 | Window Closed / Lapsed |