US4656298A
Expired / Lapsed
US
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Substituted propane-phosphonous acid compounds
Assignee: Novartis Corp
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Filing: 1985-10-15
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Granted: 1987-04-07
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Expires: 2005-10-15
Abstract
Abstract The compounds of the formula <IMAGE> I in which one of the groups R1, R2 and R3 represents hydrogen, C1-8-alkyl, C3-6-cycloalkyl, phenyl optionally substituted by halogeno, C1-4-alkyl, C1-4-alkoxy and/or trifluoromethyl, or C7-10-phenylalkyl optionally substituted in the phenyl moiety by halogeno, C1-4-alkyl, C1-4-alkoxy and/or trifluormethyl, and the other two are hydrogen, or salts thereof. These compounds have valuable pharmaceutical properties.
Inventors
- 👤 John G. Dingwall
- 👤 Josef Ehrenfreund
- 👤 Roger G. Hall
- 👤 James Jack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:46
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/48; A; A61; A61P; A61P21/00; A61P25/00; A61P25/04; A61P25/24; A61P25/26; A61P25/28; C07F9/30; C07F9/32; C07F9/3205; C07F9/3211; C07F9/4808; C07F9/4816; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/55
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
57 words
A compound of the formula ##STR27## wherein Q o is a protecting group of the formulae --CH(OR.sup.a)(OR.sup.b) or --C(C.sub.1-4 alkyl)(OR.sup.a)(OR.sup.b) in which R a and R b are each C 1-4 alkyl; R co is C 1-4 alkyl; and each R d is independently C 1-6 alkyl, R co and R d being the same or different.
Claim 2
Dependent Claim
57 words
A compound of the formula ##STR27## wherein Q o is a protecting group of the formulae --CH(OR.sup.a)(OR.sup.b) or --C(C.sub.1-4 alkyl)(OR.sup.a)(OR.sup.b) in which R a and R b are each C 1-4 alkyl; R co is C 1-4 alkyl; and each R d is independently C 1-6 alkyl, R co and R d being the same or different.
Claim 3
Dependent Claim
16 words
Compounds of formula VI as claimed in claim 1 wherein R d is C 1-2 -alkyl.
Claim 4
Dependent Claim
37 words
Compounds of formula VIA, ##STR28## in which R co and R d are as defined in claim 1 and R a , R b and R 4 are the same or different and are C 1-4 -alkyl.
Claim 5
Dependent Claim
2 words
Ethyl trimethylsilyl(diethoxymethyl)phosphonite.
Claim 6
Dependent Claim
2 words
Ethyl trimethylsilyl(diethoxymethyl)phosphonite.
Claim 7
Dependent Claim
17 words
Compounds of claim 1 selected from the group consisting of ethyl trimethylsilyl(diethoxymethyl)phosphonite, methyl trimethylsilyl(dimethoxymethyl)phosphonite and ethyl trimethylsilyl(1,1-diethoxyethyl)phosphonite.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-04-06 | 1990-10-06 | 1991-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-04-06 | 1994-10-06 | 1995-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-04-06 | 1998-10-06 | 1999-04-07 | $7700.00 | Window Closed / Lapsed |