GB2165840A - Benzenesulphonamide derivatives - Google Patents
Benzenesulphonamide derivatives Download PDFInfo
- Publication number
- GB2165840A GB2165840A GB08523798A GB8523798A GB2165840A GB 2165840 A GB2165840 A GB 2165840A GB 08523798 A GB08523798 A GB 08523798A GB 8523798 A GB8523798 A GB 8523798A GB 2165840 A GB2165840 A GB 2165840A
- Authority
- GB
- United Kingdom
- Prior art keywords
- compound
- formula
- trifluoromethyl
- pharmaceutically acceptable
- halogen
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D239/00—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings
- C07D239/70—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings condensed with carbocyclic rings or ring systems
- C07D239/72—Quinazolines; Hydrogenated quinazolines
- C07D239/86—Quinazolines; Hydrogenated quinazolines with hetero atoms directly attached in position 4
- C07D239/94—Nitrogen atoms
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D215/00—Heterocyclic compounds containing quinoline or hydrogenated quinoline ring systems
- C07D215/02—Heterocyclic compounds containing quinoline or hydrogenated quinoline ring systems having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen atoms or carbon atoms directly attached to the ring nitrogen atom
- C07D215/16—Heterocyclic compounds containing quinoline or hydrogenated quinoline ring systems having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen atoms or carbon atoms directly attached to the ring nitrogen atom with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
- C07D215/38—Nitrogen atoms
- C07D215/42—Nitrogen atoms attached in position 4
- C07D215/44—Nitrogen atoms attached in position 4 with aryl radicals attached to said nitrogen atoms
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D237/00—Heterocyclic compounds containing 1,2-diazine or hydrogenated 1,2-diazine rings
- C07D237/26—Heterocyclic compounds containing 1,2-diazine or hydrogenated 1,2-diazine rings condensed with carbocyclic rings or ring systems
- C07D237/28—Cinnolines
Abstract
Compounds having the formula <IMAGE> wherein X1 and X2 are independently hydrogen, halogen, trifluoromethyl, lower alkyl or lower alkoxy; X3 is halogen or trifluoromethyl; one of A and B is CH and the other is CH or N and their pharmaceutically acceptable acid addition salts are useful as pharmaceuticals, in particular as anti-hypertensive agents. Novel 1-[4-(amino or nitro)benzenesulphonyl]-4-benzoylpiperazines are also disclosed as intermediate compounds.
Description
SPECIFICATION
Benzenesulphonamide derivatives
The invention relates to novel benzenesulphonamide derivatives that are useful as pharmaceuticals, particularly as anti-hypertensive agents. The invention also provides processes for their preparation, pharmaceutical compositions containing them, novel compounds useful as intermediates for the preparation of the said derivatives and a process for the preparation of the intermediate compounds.
The invention provides, as novel benzenesulphonamide derivatives, compounds having the formula (I)
[wherein X1 and X2 are independently selected from hydrogen, halogen, trifluoromethyl, lower alkyl and lower alkoxy and R is selected from
(a) a group having the formula II
(where X3 is halogen or trifluoromethyl; one of A and B is CH and the other one of A and B is selected from CH and N)
(b) amino and (c) nitro] and the pharmaceutically acceptable acid addition salts of the compounds of formula I where R is a group of formula II and acid addition salts of compounds of formula I where R is amino.
The end compounds of the invention are those having formula III
(where X1, X2, X3, A and B are as defined above) and the pharmaceutically acceptable acid addition salts thereof. These compounds are particularly indicated for use as pharmaceuticals, particularly as anti-hypertensive agents.
When both A and B are CH, the end compounds of the invention are quinoline derivatives. When A is
CH whilst B is N the end compounds of the invention are quinazoline derivatives. Where A is N whilst B is CH the end compounds of the invention are cinnoline derivatives. Advantageously both A and B are
CH.
X3 may substitute any of the 5,6,7 and 8 positions of the quinoline, quinazoline or cinnoline ring system, but is preferably at the 7- or 8- position, advantageously the 7-position. Where Xs is at the 7-position, formula III may be represented as Illa
X3 represents halogen, for instance chlorine or bromine, or trifluoromethyl. X3 is preferably trifluoromethyl. X, and X2 independently represent hydrogen, halogen (for instance fluorine, chlorine or bromine), trifluoromethyl, lower alkyl (for instance methyl, ethyl, propyl, butyl) or lower alkoxy (for instance methoxy, ethoxy, propoxy, butoxy). The group having the formula
is preferably mono (halo or trifluoromethyl)phenyl, advantageously p-fluorophenyl.
The term "lower" as used herein to refer to such groups as alkyl and alkoxy indicates that the group contains up to 6, preferably up to 4, carbon atoms. The group may be in the form of a straight chain or may be branched.
The compounds having formula I where R has formula II or is amino form acid addition salts with acids. Examples of acid addition salts are those formed from inorganic and organic acids and in particular include the sulphate, hydrochloride, hydrobromide, hydroiodide, nitrate, phosphate, sulphonates (for instance the methanesulphonate or p-toluenesulphonate), acetate, maleate, fumarate, tartrate, malonate, citrate and formate.
The end compounds of the invention can be prepared by a process which comprises
(a) sulphonylating a compound having the formula (V)
(where X, and X2 are as defined above) to introduce the sulphonyl group having formula VI
(where X3, A and B are as defined above); or
(b) a compound having the formula VII
(where X1 and X2 are as defined above) or a salt thereof is reacted with a compound having the formula
VIII
(where X3, A and B are as defined above and Z is a leaving group or atom, preferably a halogen atom
such as iodine, bromine or chlorine) and, if desired a compound having formula III is converted into a pharmaceutically acceptable acid addition salt of a compound having formula III or an acid addition salt
of a compound having formula lil is converted into a compound having formula Ill.
For the purpose of step (a), the sulphonyl chloride is preferably used as sulphonylating agent. The re
action can be carried out in known manner for sulphonylation of amines. The sulphonylation can be car
ried out in a suitable solvent, for instance, chloroform or methylene chloride, in the presence of a base to
neutralise the hydrogen chloride formed. The base may be provided by using, for instance, an alkali
metal carbonate or bicarbonate or a tertiary amine, for instance, triethylamine or an excess of the basic
compound having formula V.
The sulphonyl chloride can be prepared from the corresponding sulphonic acid of formula IX
(where Xs, A and B are as defined above) in known manner, for example, by the use of thionyl chloride and dimethylformamide. The sulphonic acids having formula IX are known per sue in many cases and may be prepared in known manner in other cases, particularly by reacting 4-aminobenzenesulphonic acid with a compound having formula VIII. The preparation of the compounds having formula V is described below.
The reaction of the compound having formula VII with the compound having formula VIII according to step (b) of the process can be carried out in aqueous alcohol with or without acid catalysts. The compounds having formula VIII are generally known or, if new, can be prepared in known manner. The paminobenzenesulphonamides having formula VII are novel intermediates provided by this invention and can be prepared as described below.
Once a compound having formula III has been formed, it may be converted into a pharmaceutically acceptable acid addition salt by addition of a suitable acid. If an acid addition salt of a compound having formula Ill is prepared, the salt may be neutralised with a base to form the compound having formula Ill.
The novel chemical intermediate compounds provided by this invention are the 4-aminobenzenesulphonamides having formula VII (as shown above), their acid addition salts, and 4-nitrobenzenesulphonamide derivatives having the formula X (as shown below).
The invention also provides a process for the preparation of a 4-aminobenzenesulphonamide derivative having formula VII
(where X1 and X2 are as defined above) or a salt thereof, wherein a 4-nitrobenzenesulphonamide derivative having the formula X
(where X, and X2 are as defined above) is reduced and, if desired, a compound having formula VII is converted into an acid addition salt thereof or an acid addition salt of a compound having the formula VII is converted into the compound having formula VII.
The reduction of the nitro compound (X) is preferably carried out by means of catalytic reduction.
The invention also provides a process for the preparation of a 4-nitrobenzenesulphonamide derivative having formula X (in which X, and X2 are as defined above), wherein a compound having the formula V
(in which X1 and X2 are as defined above) or a salt thereof is sulphonylated to introduce the 4-nitrobenzenesulphonyl group. As sulphonylating agent 4-nitrobenzenesulphonyl chloride is preferably used. The sulphonylation can be carried out in a suitable solvent, for instance, chloroform or methylene chloride, in the presence of a base to neutralise the hydrogen chloride formed. The base may be provided by using, for instance, an alkali metal carbonate or bicarbonate or a tertiary amine, for instance, triethylamine, or an excess of the basic compound having formula V.
The compounds having formula V are known, at least in some cases. They can be prepared by coupling 1-benzylpiperazine with a compound having the formula XI
(where X1 and X2 are as defined above) or a reactive derivative thereof to form an amide having the formula XII
and debenzylating the amide (Xil). The amide may be formed by reacting 1-benzylpiperazine with the acid (Xl) in the presence of a condensing agent or by reacting 1-benzylpiperazine with a reactive derivative (for instance, acid chloride, acid anhydride or active ester) of the acid (XI). The debenzylation can be carried out by means of catalytic hydrogenation.
The novel compounds having general formula Ill and their pharmaceutically acceptable salts are indicated for use as anti-hypertensive agents. The compounds may be tested for their response on the blood pressure of spontaneously hypertensive rats in the following procedure:
The blood pressure of male or female conscious rats that are spontaneously hypertensive are measured in a 39"C constant temperature housing by means of a tail cuff. Rats with systolic pressures below 155mm Hg are not used. Groups of rats (4 per group) are dosed orally with the test substance in a suitable vehicle or with vehicle alone. Systolic pressures are recorded before dosing and at selected time points afterwards (2 hours, 6 hours and 24 hours).
One of the compounds of the invention is 1-[4-fluorobenzoyl]-4-[4-(7-trifluoromethyl-4-quinolinylam- ino)benzenesulphonyl]piperazine. A compound related thereto, 1-[(4-fluorophenyl)sulphonyl]-4-[4-(7-tri- fluoromethyl-4-quinolylamino)benzoyl]piperazine, is known from G.B. 2,021,567A. These two compounds can be represented by the formula (A)
where Z, is SO2 and Z2 is CO in the case of the invention and Z1 is CO and Z2 is SO2 in the case of the
known compound. These two compounds have been tested in the above procedure and the results are
presented in the following table.
The compound of the invention was tested as the monoethanolate. The prior art compound was tested as the hydrochloride 1/3 ethanolate.
Blood pressure (as % of blood pressure
Compound Dose before dosing
of Fmillimoles per kg) After After After
2 hours 6hours 24 hours
Prior Art 0.03 72 68 71
(Z1=CO, Z2=SO2) Invention 0.03 47 38 62 (Z1=SO2, Z2=CO) 0.003 70 54 85
The results show that the compound of the invention was far more effective than the known compound at the same dose (0.03 millimoles per kg).
The invention also provides a pharmaceutical composition comprising a compound having formula I or a pharmaceutically acceptable acid addition salt thereof in association with a pharmaceutically acceptable carrier. Any suitable carrier known in the art can be used to prepare the pharmaceutical composition. In such a composition, the carrier is generally a solid or liquid or a mixture of a solid and a liquid.
Solid form compositions include powders, granules, tablets, capsules (e.g. hard and soft gelatin capsules), suppositories and pessaries. A solid carrier can be, for example, one or more substances which may also act as flavouring agents, lubricants, solubilisers, suspending agents, fillers, glidants, compression aides, binders or tablet-disintegrating agents; it can also be an encapsulating material. In powders the carrier is a finely divided solid which is in admixture with the finely divided active ingredient. In tablets the active ingredient is mixed with a carrier having the necessary compression properties in suitable proportions and compacted in the shape and size desired. The powders and tablets preferably contain up to 99%, e.g. from 0.03 to 99%, preferably 1 to 80% of the active ingredient.Suitable solid carriers include, for example, calcium phosphate, magnesium stearate, talc, sugars, lactose, dextrin, starch, gelatin, cellulose, methyl cellulose, sodium carboxymethyl cellulose, polyvinylpyrrolidine, low melting waxes and ion exchange resins.
The term "composition" is intended to include the formulation of an active ingredient with encapsulating material as carrier to give a capsule in which the active ingredient (with or without other carriers) is surrounded by the carrier, which is thus in association with it. Similarly cachets are included.
Liquid form compositions include, for example, solutions, suspensions, emulsions, syrups, elixirs and pressurised compositions. The active ingredient, for example, can be dissolved or suspended in a pharmaceutically acceptable liquid carrier such as water, an organic solvent, a mixture of both or pharmaceutically acceptable oils or fats. The liquid carrier can contain other suitable pharmaceutical additives such as solubilizers, emulsifiers, buffers, preservatives, sweeteners, flavouring agents, suspending agents, thickening agents, colours, viscosity regulators, stabilisers or osmo-regulators.Suitable examples of liquid carriers for oral and parenteral administration include water (particularly containing additives as above e.g. cellulose derivatives, preferably sodium carboxymethyl cellulose solution), alcohols (including monohydric alcohols and polyhydric alcohols e.g. glycerol and glycols) and their derivatives and oils (e.g.
fractionated coconut oil and arachis oil). For parenteral administration the carrier can also be an oily ester such as ethyl oleate and isopropyl myristate. Sterile liquid carriers are used in sterile liquid form compositions for parenteral administration.
Liquid pharmaceutical compositions which are sterile solutions or suspensions can be utilised by, for example, intramuscular, intraperitoneal or subcutaneous injection. Sterile solutions can also be administered intravenously. When the compound is orally active it can be administered orally either in liquid or solid composition form.
Preferably the pharmaceutical composition is in unit dosage form, e.g. as tablets or capsules. In such form, the composition is sub-divided in unit dose containing appropriate quantities of the active ingredient; the unit dosage forms can be packaged compositions, for example packeted powders, vials, ampoules, prefilled syringes or sachets containing liquids. The unit dosage form can be, for example, a capsule or tablet itself, or it can be the appropriate number of any such compositions in package form.
The quantity of the active ingredient in unit dose of composition may be varied or adjusted from 0.5 mg or less to 750 mg or more, according to the particular need and the activity of the active ingredient. The invention also includes the compounds in the absence of the carrier where the compounds are in unit dosage form.
The invention is illustrated by the following examples:
Example 1 l-J4-Fluorob enzo ylJ-4-[4-(7-trffluorometh yl-4-quin olin ylamino)benzen esuiphon yI]pip erazin e 4-(7-Trifluoromethyl-4-quinolinylamino)benzenesulphonyl chloride hydrochloride (3.5g, 0.008mol) was added portionwise to a cold (10 ), well stirred mixture of 1-(4-fluorobenzoyl)piperazine hydrochloride (2.09, 0.008mol) in chloroform (50ml) and sodium carbonate (10.09) in water (50ml). The cooling bath was removed and the mixture was allowed to warm to room temperature. After half an hour, the mixture was filtered and the filtrate separated. The chloroform layer was dried (MgSO4). The solvent was removed by evaporation to give a yellow gum.The gum was crystallised from ethanol-water, then purified by column chromatography (basic Al203-chloroform) followed by recrystallisation from ethanol, to give the pure title compound (0.9g), m.p. 172-174.5"C.
Analysis:
Found: C, 57.3%; H, 4.63%; N 9.71%.
C27H22F4N4O3S. C2H5OH requires C, 57.6%; H, 4.67%; N, 9.30%.
Example 2 l-14-(7-Chloro-4-quinolln ylamino)b enzenesulph on yl]-4- (4-fluorobenzo yl)piperazine 4-(7-Chloro-4-quinolinylamino)benzenesulphonyl chloride hydrochloride (7.8g, 0.02mol) was added portionwise with stirring to a cold mixture of 1-(4-fluorobenzoyl)piperazine hydrochloride (4.99, 0.02mol) in chloroform (250ml) and sodium carbonate (24.4g) in water (250ml). The cooling bath was removed and the mixture was allowed to warm to room temperature. After 1 hour the chloroform layer was separated and dried (MgSO4). The solvent was removed by evaporation to give a brown gum. Crystallisation from ethanol gave the pure title compound (0.539), m.p. 235-237tC.
Analysis:
Found: C, 59.5%; H, 4.05%; N, 11.0%.
C26H2ClFN4O3S requires C, 59.4%; H, 4.41%; N, 10.7%
Example 3 I--fluorobenzo yl]-4-[4- (7-trifluorom ethyl-4quin olin ylamin o)benzenesulp hon ypiperazine 1-(4-fluorobenzoyl)-4-(4-nitrobenzenesulphonyl)piperazine is prepared in a similar manner to Examples 1 and 2 by reacting equimolar quantities of 4-nitrobenzenesulphonyl chloride with 1-(4-fluorobenzoyl)piperazine hydrochloride. The reaction product is hydrogenated in ethanol at room temperature at atmospheric pressure with a 5% paladium on charcoal catalyst until hydrogen uptake ceases to yield 1-(4aminobenzenesulphonyl)-4-(4-fluorobenzoyl) piperazine. Equimolar quantities of this compound and 4 chloro-7-trifluoroquinoline are reacted in 50% aqueous ethanol under reflux to yield the title compound.
Claims (16)
1. A compound having the formula
or a pharmaceutically acceptable salt thereof, wherein Xç and X2 are, independently, hydrogen, halogen, trifluoromethyl, lower alkyl or lower alkoxy; X3 is halogen or trifluoromethyl; one of A and B is CH and the other one of A and B is CH or N.
2. A compound as claimed in Claim 1, wherein X3 is at the 7- position.
3. A compound as claimed in Claim 1 or 2, wherein both A and B are CH.
4. A compound as claimed in any one of Claims 1 to 3, wherein one of X1 and X2 is hydrogen and the other one of X1 and X2 is halogen or trifluoromethyl.
5. A compound as claimed in any one of Claims 1 to 4, wherein X3 is trifluoromethyl.
6. 1-[4-fluorobenzoyl]-4-[4-(7-trifluoromethyl-4-quinolinylamino)benzenesulphonyl]piperazine or a pharmaceutically acceptable salt thereof.
7. 1 -[4-(7-Chloro-4-quinolylamino)benzenesulphonylj-4-(4-fluorobenzoyl)piperazine.
8. A process for the preparation of a compound as claimed in Claim 1, in which (a) a compound having the formula V
(wherein X1 and X2 are as defined in Claim 1) is sulphonylated to introduce the sulphonyl group having formula VI
(where Xs, A and B are as defined in Claim 1); or (b) a compound having the formula VII
(wherein X, and X2 is defined above) or a salt thereof is reacted with a compound having the formula VIII
(where X3, A and B are as defined above and Z is a leaving group or atom) and, if desired, a compound having formula Ill is converted into a pharmaceutically acceptable acid addition salt of a compound having formula Ill or an acid addition salt of a compound having formula Ill is converted into a compound having formula Ill.
9. A process as claimed in Claim 8, carried out substantially as described in any one of Examples 1 to 3 herein.
10. A compound as claimed in Claim 1, whenever prepared by a process as claimed in any one of
Claims 8 or 9.
11. A compound as claimed in any one of Claims 1 to 7 for use as a pharmaceutical.
12. A pharmaceutical composition comprising a compound as claimed in any one of Claims 1 to 7 and 10 in association with a pharmaceutically acceptable carrier.
13. A compound having the general formula I
wherein R is amino or nitro and X1 and X2 are, independently, hydrogen, halogen, trifluoromethyl, lower alkyl or lower alkoxy, or an acid addition salt of such a compound where R is amino.
14. A process for the preparation of a compound having the formula VII
wherein X1 and X2 are as defined in Claim 13, wherein a compound having the formula X
(wherein X, and X2 are as defined above) is reduced.
15. A process for the preparation of a compound having the formula X as defined and illustrated in
Claim 14, wherein a compound having formula V
(in which X1 and X2 is as defined in Claim 13) or a salt thereof is sulphonylated to introduce the 4-nitrobenzenesulphonyl group.
16. A compound as claimed in Claim 13, whenever prepared by a process as claimed in Claim 14 or 15.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08523798A GB2165840B (en) | 1984-10-03 | 1985-09-20 | Benzenesulphonamide derivatives |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB848424979A GB8424979D0 (en) | 1984-10-03 | 1984-10-03 | Benzenesulphonamide derivatives |
| GB08523798A GB2165840B (en) | 1984-10-03 | 1985-09-20 | Benzenesulphonamide derivatives |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8523798D0 GB8523798D0 (en) | 1985-10-30 |
| GB2165840A true GB2165840A (en) | 1986-04-23 |
| GB2165840B GB2165840B (en) | 1987-09-09 |
Family
ID=26288298
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08523798A Expired GB2165840B (en) | 1984-10-03 | 1985-09-20 | Benzenesulphonamide derivatives |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2165840B (en) |
-
1985
- 1985-09-20 GB GB08523798A patent/GB2165840B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| GB8523798D0 (en) | 1985-10-30 |
| GB2165840B (en) | 1987-09-09 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19940920 |