CY1475A - An indole derivative - Google Patents

Description

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GB2162 522A

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SPECIFICATION

An indole derivative

5 This invention relates to an indole derivative of use in the treatment of migraine, to processes for 5 its preparation, to pharmaceutical compositions containing it and to its medicat use.

The pain of migraine is associated with excessive dilation of the cranial vasculature and known treatments for migraine include the administration of compounds having vasoconstrictor properties such as ergotamine. However, ergotamine is a non-selection vasoconstrictor which 10 constricts blood vessels throughout the body and has undesirable and potentially dangerous side 10 effects. Migraine may also be treated by administering an analgesic, usually in combination with an antiemetic, but such treatments are of limited value.

There is thus a need for a safe and effective drug for the treatment of migraine, which can be used either prophylactically or to alleviate an established headache, and a compound having a 1 5 selective vasoconstrictor activity would fulfil such a role. 15

Furthermore, in conditions such as migraine, where the drug will usually be administered by the patient, it is highly desirable that the drug can be taken orally. It should therefore possess good bioavailability and be effectively absorbed from the gastro-intestinal tract so that prompt relief of symptoms can occur. The drug should also be safe {i.e. free from toxic effects) when 20 administered by the oral route. 20

A wide variety of indole derivatives have been described as being of use in the treatment of migraine. In our published UK Patent Application No. 212421 OA we describe indoles of the general formula

25 f,fijHS0jCHSj^5?y\_-4lkNRlR5

25

wherein R, represents a hydrogen atom or a C,_6 alkyl or C3_6 alkenyl group; R2 represents a 30 hydrogen atom or a C^ alkyl, C3.6 alkenyl, aryl, ar{C1.4)alkyl, or C5_7 cycloalkyl group; R3 30

represents a hydrogen atom or a C,.3 alkyl group, R4 and R5, which may be the same or different, each represents a hydrogen atom or a C,_3 alkyi or propenyl group or R„ and R5 together form an aralkylidene group; and Alk represents an alkylene chain containing two or three carbon atoms which may be unsubstituted or substituted by not more than two C,_3 alkyl 35 groups, and physiologically acceptable salts and solvates thereof. 35

As indicated in UK Patent Application No. 212421 OA, compounds of the above formula selectively constrict the carotid arterial bed of the anaesthetised dog and are thus potentially useful for the treatment of migraine.

We have now found a particular compound which falls within the scope of the group of 40 compounds described and claimed in UK Patent Application No. 212421 OA but which is not 40 specifically disclosed therein, which compound has special advantages. Thus, we have discovered that by a selection of two specific substituents, namely the methylsaminosulphonylme-thyl group at the 5- position of the indole nucleus and the N,N-dimethylaminoethyl substituent at the 3- position, a compound having a combination of highly advantageous properties for the 45 treatment of migraine is obtained. 45

Thus the present invention provides 3-[2-(dimethylamino)-ethyl]-N-methyl- 7/7-indole -5-meth-anesulphonamide, of formula (I)

HjC ,CH,

50 \ / 50

,NS0;CH2. - _CH2CH,N (!)

■7 XXX

55 and its physiologically acceptable salts and solvates (e.g. hydrates). 55

The compounds according to the invention are useful in treating and/or preventing pain resulting from dilatation of the cranial vasculature, in particular migraine and related disorders such as cluster headache.

The compound of formula (1) potently and selectively constricts the carotid arterial bed 60 following intravenous administration as shown by tests in anaesthetised dogs. This potent and 60 selective vasoconstrictor action has also been demonstrated in vitro. Further tests in anaesthetised dogs have shown that the compound of formula (I) is effectively and consistently well absorbed from the gastro-intestinal tract following intra-duodenal administration, quickly producing a sustained vasoconstriction in the carotid arterial bed.

65 At doses at which the compound of formula (I) would be efficacious in the treatment of 65

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migraine it has no significant effect on blood pressure and heart rate and no significant bronchoconstrictor effect on the lung.

The compound of formula (I) may safely be administered orally as well as intravenously.

The combination of these properties possessed by the compound of formula (1) is highly 5 desirable in the treatment of migraine and the compound (I) has significant advantages, as demonstrated by the aforementioned experimental tests, over compounds which have previously been described as being of use in the treatment of migraine, such as those disclosed in published UK Patent Application No. 212421 OA. It is particularly advantageous that the compound of formula (I) is effectively absorbed from the gastro-intestinal tract in a consistent 10 manner.

Furthermore, tests in guinea pigs have shown that the compound of formula (I) promotes gastric emptying following oral administration, and hence relieves gastric stasis. Gastric stasis is a symptom commonly associated with migraine. Hence the ability of the compound of formula (I) to relieve gastric stasis is a further beneficial property of this compound in the treatment of 15 migraine.

Suitable physiologically acceptable salts of the compound of formula (I) include acid addition salts formed with organic or inorganic acids for example hydrochlorides, hydrobromides, sulphates, nitrates, phosphates, formates, mesylates, citrates, benzoates, fumarates, maleates and succinates. Other salts may be useful in the preparation of the compound of formula (I) e.g. 20 creatinine sulphate adducts, and salts with e.g. toluene-p-sulphonic acid.

Where a salt of the compound (I) according to the invention is formed with a dicarboxylic acid, such as succinic acid, the salt may be formed with either one or both of the carboxylic acid groups, i.e. the salt may contain either one or two moles of the compound (I) per mole of acid. A preferred salt according to the invention is the succinate, most preferably the 1:1 succinate. 25 According to a further aspect, the invention provides a method of treatment of a human subject suffering from or susceptible to pain resulting from dilatation of the cranial vasculature, such as migraine or cluster headache, by administration of a compound of formula (I) or a physiologically acceptable salt or solvate thereof. The method of treatment preferably comprises oral administration of a compound of the invention.

30 Accordingly, the invention also provides a pharmaceutical composition adapted for use in medicine which comprises the compound of formula (I) and/or a physiologically acceptable salt or solvate (e.g. hydrate) thereof, formulated for administration by any convenient route. Such compositions may be formulated in conventional manner using one or more pharmaceutical^ acceptable carriers or excipients. The compounds according to the invention may be formulated 35 for oral, sub-lingual, parenteral, rectal or intra-nasal administration, or in a form suitable for administration by inhalation or insufflation. Formulations of the compounds for oral administration are preferred.

The pharmaceutical compositions for oral administration may take the form of, for example, tablets or capsules prepared by conventional means with pharmaceutical^ acceptable excipients 40 such as binding agents (e.g. pregelatinised maize starch, polyvinylpyrrolidone or hydroxypropyl methylcellulose); fillers (e.g. lactose, sucrose, mannitol. maize starch, microcrystalline cellulose or calcium hydrogen phosphate); lubricants (e.g. stearic acid, polyethylene glycol, magnesium stearate, talc or silica); disintegrants (e.g.) potato starch, sodium starch glycollate or croscarmel-lose sodium); or wetting agents (e.g. sodium lauryl sulphate). The tablets may be coated by 45 methods well known in the art. Liquid preparations for oral administration may take the form of, for example, aqueous or oily solutions, syrups, elixirs, emulsions or suspensions, or they may be presented as a dry product for constitution with water or other suitable vehicle before use. Such liquid preparations may be prepared by conventional means with pharmaceutically acceptable additives such as suspending agents (e.g. sorbitol syrup, cellulose derivatives, glucose/sugar 50 syrup, gelatin, aluminium stearate gel, or hydrogenated edible fats); emulsifying agents (e.g. lecithin, acacia or sorbitan mono-oleate); non-aqueous vehicles (e.g. almond oil, oily esters,

ethyl) alcohol or fractionated vegetable oils); and preservatives (e.g. methyl or propyl p-hydroxybenzoates or sorbic acid). The liquid preparations may also contain conventional buffers, flavouring, colouring and sweetening agents as appropriate.

55 A proposed dose of the compounds of the invention for oral administration to man (about 70 kg bodyweight) for the treatment of migraine is 0.1 mg to 100mg, for example 0.5 mg to 50mg, preferably 2mg to 40mg, of the active ingredient per dose which could be administered up to 8 times per day, more usually 1 to 4 times per day. It will be appreciated that it may be necessary to make routine variations to the dosage depending on the age and weight of the 60 patient, as well as the severity of the condition to be treated. It should be understood that unless otherwise indicated, the dosages are referred to in terms of weight of compound (I) as the free base.

The compounds of the invention may be formulated for parenteral administration by injection, preferably intravenous or subcutaneous injection e.g. by bolus injection or continuous intrave-65 nous infusion. Formulations for injection may be presented in unit dosage form e.g. in ampoules

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or in multi-dose containers, with an added preservative. The compositions may take such forms as suspensions, solutions or emulsions in oily or aqueous vehicles, and may contain formulatory agents such as suspending, stabilising and/or dispersing agents an/or agents to adjust the tonicity of the solution. Alternatively, the active ingredient may be in powder form for 5 constitution with a suitable vehicle, e.g. sterile pyrogen-free water, before use.

The overall daily dose administered by injection may be in the range 50/zg to 50mg, e.g. 0.5 to 20mg, which may for example be divided into 2,3 or 4 doses.

The compounds of the invention may also be formulated in rectal compositions such as suppositories or retention enemas, e.g. containing conventional suppository bases such as cocoa 10 butter or other glycerides.

Tablets for sub-lingual administration may be formulated in a similar manner to those for oral administration.

For intra-nasal administration the compounds of the invention may be used as a liquid spray or in the form of drops.

15 Dosages of the compounds of the invention for rectal, sub lingual or intranasal administration to man (of average body weight e.g. about 70 kg) for the treatment of migraine may be similar to those described previously for oral administration.

For administration by inhalation the compounds according to the invention are conveniently delivered in the form of an aerosol spray presentation from pressurised packs, with the use of a 20 suitable propellant, e.g. dichlorodifluoromethane, trichlorofluoromethane, dichlorotetrafluoroe-thane, carbon dioxide or other suitable gas, or from a nebuliser. In the case of a pressurised aerosol the dosage unit may be determined by providing a valve to deliver a metered amount. Capsules and cartridges of e.g. gelatin for use in an inhaler or insufflator may be formulated containing a powder mix of a compound of the invention and a suitable powder base such as 25 lactose or starch.

Aerosol formulations are preferably arranged as that each metered dose or "puff" delivered from a pressurized aerosol conains 0.2 mg to 2 mg of a compound of the invention, and each dose administered via capsules and cartridges in an insufflator or an inhaler contains 0.2 mg to 20 mg of a compound of the invention. Administration may be several times daily, for example 30 from 2 to 8 times, giving for example 1, 2 or 3 doses each time. The overall daily dose by inhalation will be similar to that for oral administration.

The compounds of the invention may, if desired, be administered in combination with one or more other therapeutic agents, such as analgesics, anti-inflammatory agents and anti-nauseants.

The compounds of formula (I) and its physiologically acceptable salts and solvates (e.g. 35 hydrates) may be prepared by the general methods outlined hereinafter.

According to one general process (A), the compound of formula (I) may be prepared by cyclisation of the compound of formula (II)

40

■ XX /"'

\

ch3

45 The reaction may conveniently be effected in aqueous or non-aqueous reaction media and at temperatures of from 10 to 200°C, preferably 50 to 125°C.

Particularly convenient embodiments of process (A) are described below.

The cyclisation is desirably carried out in the presence of polyphosphate ester in a reaction medium which may comprise one or more organic solvents, preferably halogenated hydrocar-50 bons such as chloroform, dichloromethane, dichloroethane, dichlorodifluoromethane, or mixtures thereof. Polyphosphate ester is a mixture of esters which may be prepared from phosphorus pentoxide, diethylether and chloroform according to the method described in 'Reagents for Organic Synthesis', (Fieser and Fieser, John Wiley and Sons 1967).

Alternatively the cyclisation may be carried out: in aqueous or non-aqueous media, in the 55 presence of an acid catalyst. When an aqueous medium is employed this may be an aqueous organic solvent such as an aqueous alcohol (e.g. methanol, ethanol or isopropanol) or an aqueous ether (e.g. dioxan or tetrahydrofuran) as well as mixtures of such solvents and the acid catalyst may be for example an inorganic acid such as concentrated hydrochloric or sulphuric acid or an organic acid, such as acetic acid. (In some cases the acid catalyst may also act as the 60 reaction solvent). In an anhydrous reaction medium, which may comprise one or more alcohols or ethers (e.g. as previously described) or esters (e.g. ethyl acetate), the acid catalyst will generally be a Lewis acid such as boron trifluoride, zinc chloride or magnesium chloride.

According to a particular embodiment of this cyclisation process, the compound of formula (I) may be prepared directly by the reaction of the compound of formula (III)

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or a salt (e.g. the hydrochloride salt) thereof, with the compound formula (IV)

ch3

10 /

OHC|CH2]3H^

CHj or a salt or protected derivative thereof (such as an acetal, for example, a dialkyl or cyclic acetal 15 e.g. formed with an appropriate alkyl orthoformate or dioi, or protected as a bisulphite addition complex), using the appropriate conditions as previously described for the cyclisation of the compound of formula (II). (The Fischer-lndole Synthesis, B. Robinson p488-Wiley 1982). It will be appreciated that in this embodiment of the cyclisation process (A) a compound of formula (II) is formed as an intermediate and reacted in situ to form the desired compound of formula (I). 20 The compound of formula (II) may, if desired, be isolated as an intermediate by reacting the compound of formula (III), or a salt or protected derivative thereof with the compound of formula (IV) or a salt or protected derivative thereof, in water or in a suitable solvent, such as an aqueous alcohol (e.g. methanol) or an aqueous ether (e.g. dioxan) and at a temperature of, for example, from 10 to 30°C. If a acetal of the compound of formula (IV) is used it may be 25 necessary to carry out the reaction in the presence of an organic or inorganic acid (for example, acetic or hydrochloric acid).

The compound of formula (III) may be prepared for example as described in UK Patent Application No. 212421 OA.

As illustrated in the following general processes (B) and (C), the dimethylamino substituent 30 may be introduced at the 3- position by conventional techniques involving modification of a substituent at the 3- position or direct introduction of the aminoalkyl substituent into the 3-position.

Thus a further general process (B) for preparing the compound of formula (I) involves reacting a compound of general formula (V)

(wherein Y is a readily displaceable atom or group) or a protected derivative thereof, with dimethylamine.

Suitable displaceable atoms or groups Y include a halogen atom (e.g. chlorine, bromine or 45 iodine); a group OR6 where OR6 is, for example, an acyloxy group, which may be derived from a carboxylic or sulphonic acid, such as an acetoxy, chloroacetoxy, dichloroacetoxy, trifluoroace-

toxy, p-nitrobenzoyloxy p-toluenesulphonyloxy or methanesulphonyloxy group; or a group

© ©

NR7R8R9E ,

50 where R7, Rs and Rg each represents a C,_3 alkyl group, and E~ represents an anion such as a halide ion, e.g. a chloride, bromide or iodide ion.

The displacement reaction may conveniently be effected in an inert organic solvent (optionally in the presence of water), examples of which include alcohols, e.g. ethanol; cyclic ethers e.g. dioxan or tetraydrofuran; acyclic ethers, e.g. diethylether; esters e.g. ethyl acetate; amides e.g. 55 N,N-dimethylformamide; and ketones e.g. acetone, methylethylketone or methylisobutylketone. The process may be carried out at a temperature of, for example, — 10 to +150°C, preferably 20 to 100°C.

The compounds of formula (V) wherein Y is a halogen atom may be prepared by reacting the hydrazine of formula (III) with an aldehyde (or a protected derivative thereof) of formula (VI).

60

0HC(CH2)3Y (VI)

(wherein Y is as previously defined) in an aqueous alcohol (e.g. methanol) or an aqueous ether (e.g. dioxan) containing an acid (e.g. acetic or hydrochloric acid) or by reacting the compound of 65 formula (VII)

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h3c

,HSG,CH^^ C»,CH,aH

/ XX/

5 »

with the appropriate halogenating agent such as a phosphorus trihalide, thionyl chloride or N-bromosuccinimide and triphenylphosphine, in a suitable solvent, for example pyridine or tetrahydrofuran. The compound of formula (VII) may also be used to prepare compounds of 10 formula (V), wherein Y is a group OP6 by acylation with the appropriate activated species derived from a carboxylic or sulphonic acid (e.g. an anhydride or sulphonyl chloride) using conventional techniques. The alcohol (VI!) may be prepared for example by cyclisation of the appropriate hydrazone as described in UK Published Patent Application No. 2150932A. Compounds of formula (V) where Y represents the group 15 @ ©

NR7R8RgE ,

may be prepared from the corresponding primary amine by reaction with an appropriate alkylating agent, for example as described in general process (E) hereinafter.

The compound of formula (I) may also be prepared by another general process (C) involving 20 reduction of a compound of general formula (VIII)

/ r 1 il rani k

(wherein W is a group capable of being reduced to give the required dimethylaminoethyl group) or a salt or protected derivative thereof.

The required -{CH2)-Z and dimethylamino moieties may be formed by reduction steps which 30 take place separately or together in any appropriate manner.

Groups which may be reduced to the -(CH2)-2 moiety include the corresponding unsaturated group and corresponding groups containing one or more carbonyl functions and/or a hydroxyl group.

The group W may be a group which is itself reduced to the dimethylaminoethyl moiety. 35 Examples of such groups include -(CH2)-N(CH3)COR10 (where R10 represents a hydrogen atom, or an alkoxy or aralkoxy group); -COCON(CH3)2; -CH2CON(CH3)2; -CH(OH)CH2N(CH3)2; and -COCH2N(CH3)2.

Alternatively W may represent a group which gives the dimethylaminoethyl moiety upon reduction in the presence of dimethylamine, for example -CH2CN and -CH2CHO. 40 A particularly suitable method for preparing the compound of formula (I) is reductive methylation of the corresponding amino or methylamino derivative with formaldehyde in the presence of a suitable reducing agent. It will be appreciated that at least two equivalents of formaldehyde should be used when the starting' material is the primary amine. If desired, the formaldehyde may first be condensed with the amine and the intermediate thus formed may 45 subsequently be reduced.

Reduction of the compound of formula (VIII) may be effected by conventional methods, for example by catalytic hydrogenation or using a reducing agent such as an alkali metal or alkaline earth metal borohydride or cyanoborohydride. The reduction may conveniently be effected in an organic reaction medium which may comprise one or more organic solvents. Suitable solvents 50 include alcohols, e.g. ethanol or propanol; cyclic ethers, e.g. dioxan or tetrahydrofuran; acyclic ethers e.g. diethyl ether; amides, e.g. dimethylformamide; esters, e.g. ethyl acetate, and nitriles e.g. acetonitrile.

It will be appreciated that the choice of reducing agent and reaction conditions will be dependent on the nature of the group W.

55 Suitable reducing agents which may be used in the above process for the reduction of compounds of formula (Vill) wherein W represents, for example, the group -CH(OH)CH2N(CH3)2 include hydrogen in the presence of a metal catalyst, for example Raney Nickel or a noble metal catalyst such as platinum, platinum oxide, palladium or rhodium, which may be supported, for example, on charcoal, kieselguhr or alumina. In the case of Raney Nickel, hydrazine may also be 60 used as the source of hydrogen. This process may conveniently be carried out in a solvent such as an alcohol e.g. ethanol, an ether, e.g. dioxane or tetrahydrofuran, an amide, e.g. dimethylformamide or an ester e.g. ethyl acetate, and at a temperature of from — 10 to + 50°C, preferably - 5 to + 30 °C.

The reduction process may also be effected on compounds of formula (VIII) wherein W 65 represent, for example, the group -CH(OH)CH2N(CH3)2 or -COCH2N(CH3)2 using an alkali metal

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or alkaline earth metal borohydride or cyanoborohydride e.g. sodium or calcium borohydride or cyanoborohydride which process may conveniently be carried out in an alcohol such as propanol, ethanol or methanol, and at a temperature of from 10 to 100°C, preferably 50 to 100°C. In some instances, the reduction using a borohydride may be carried out in the presence 5 of cobaltous chloride. 5

Reductive methylation of the aminoethyl or methylaminoethyi compound corresponding to formula (I) with formaldehyde may be also effected using an alkali metal or alkaline earth metal borohydride or cyanoborohydride. The reaction may be effected in an aqueous or non-aqueous reaction medium, conveniently in an alcohol as just described, or an ether, e.g. dioxan or 10 tetrahydroduran, optionally in the presence of water. In this embodiment, the reaction may be 10 effected in the presence of an acid e.g. acetic acid, and at a temperature in the range 0 to 100°C, preferably 5 to 50°C.

Reduction of compounds of formula (VIII) wherein W represents, for example, the groups -(CH2)2N(CH3)CHO, -CH2C0N(CH3)2, -CH(OH)CH2N(CH3)2/ ~COCON(CH3)2 and -COCH2N(CH3)2, 15 may also be carried out using a metal hydride such as lithium aluminium hydride. This process 15 may be carried out in a solvent, for example, an ether such as tetrahydrofuran, and conveniently at a temperature of from — 10 to +100°C, peferably 50 to 100°C.

A particular embodiment of general process (C) involves the reduction of a compound of formula (VIII) wherein W is the group -CH2CN, for example, by catalytic reduction with 20 hydrogen in the presence of a catalyst such as palladium on charcoal or rhodium on alumina in 20 the presence of diemethylamine. The reduction may be effected in a suitable solvent such as an alcohol, e.g. methanol or ethanol.

The starting materials or intermediate compounds of general formula (VIII) may be prepared by analogous methods to those described in UK Published Patent Application No. 2124210, or 25 by modification of the 5- position substituent as in process (D) below. 25

According to another general process (D), the compound of formula (I) may be prepared by reacting a compound of formula (IX)

y:*3

30 "'>'■> 30

CH-,

(El

(where X represents a leaving atom or group), or a salt thereof, with methylamine.

Examples of suitable leaving atoms or groups X in the compounds of general formula (IX) 35 includes a halogen atom (e.g. a fluorine, chlorine or bromine atom) or a group OR,, where R,, 35 represents a hydrocarbyl group such as an aryl group, e.g. phenyl. The aryl group may be unsubstituted or substituted by one or more substituents such as halogen atoms; or nitro; cyano; amino; alkyl e.g. methyl; alkoxy e.g. methoxy; acyl, e.g. acetyl and alkoxycarbonyl e.g. ethoxycarbonyl groups. The leaving atom or group represented by X is preferably a phenoxy 40 group. 40

The reaction is conveniently carried out in the presence of a solvent and may be effected in an aqueous or non-aqueous reaction medium.

The reaction medium may thus comprise one'or more organic solvents, such as ethers, e.g.

dioxan or tetrahydrofuran; amides e.g. N,N-dimethylformamide or N-methylpyrrolidone; alcohols 45 e.g. methanol or ethanol; esters e.g. ethyl acetate; nitrites e.g. acetonitrile; halogenated 45

hydrocarbons e.g. dichloromethane; and tertiary amines e.g. triethylamine or pyridine, optionally in the presence of water. In some cases methylamine may itself serve as the solvent.

If desired the aminolysis may be effected in the presence of a base, such as an alkali metal carbonate or bicarbonate (e.g. sodium or potassium carbonate or bicarbonate); a tertiary amine 50 (e.g. triethylamine or pyridine); an alkoxide (e.g. sodium t-butoxide) or a hydride (e.g. sodium 50 hydride).

The reaction may conveniently be effected at a temperature of from — 20° to + 150°C.

The starting materials of general formula (IX) wherein X represents a group ORn may be prepared for example by reduction of a compound of general formula (X)

55 55

XS0?CH?^ w

XXf

1*1

60 (wherein X is as previously defined and W is the group CH2CN or CH2CH0) or a salt or protected 60 derivative thereof, in the presence of dimethylamine, using the general methods described above for general process (C).

A compound of formula (IX) wherein X represents a halogen atom may be prepared for example by reacting the corresponding sulphonic acid derivative or a salt thereof with a 65 halogenating agent such as a phosphorus halide or oxyhalide in an inert organic solvent e.g. 65

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phosphorus pentachloride in dichloromethane. A sulphonic acid of formula (IX) where X is OH, may be prepared for example by acid or base catalysed hydrolysis of an ester of formula (IX), (i.e. a compound wherein X represents the group 0Rn).

Compounds of formula (X) and sulphonic acid derivatives of formula (IX) (wherein X is a 5 hydroxy group) may be prepared by analogous methods to those described in European 5

Published Patent Application No. 145459 and 'A Chemistry of Heterocyclic Compounds-ln-doles Part II' Chapter VI edited by W.J. Hamilton (1972) Wiley Interscience, New York.

According to a further general process (E) the compound of formula (I) may be prepared by reacting the compound of formula (XI) 10 10

(wherein R12, R13 and R,„ each represents hydrogen or a methyl group, at least one of R12, R13 and R14 being hydrogen) with a methylating agent. Methylating agents which may be used in this process include methyl halides (e.g. methyl iodide), methyl tosylate, or dimethylsufphate. It 20 will be appreciated the methylating agent should be used in sufficient quantity to introduce the 20 required number of methyl groups. Thus for example when two of R12, Ri3 and R14 represent hydrogen at least two equivalents of the methylating agent should be employed. The reaction is conveniently carried out in an inert organic solvent such as an amide (e.g. dimethylformamide), an ether (e.g. tetrahydrofuran) or an aromatic hydrocarbon (e.g. toluene) preferably in the 25 presence of a base. Suitable bases include, for example, alkali metal hydrides, such as sodium 25 or potassium hydride; alkali metal amides, such as sodium amide; alkali metal carbonates, such as sodium carbonate; or alkali metal alkoxides such as sodium or potassium methoxide, ethoxide or t-butoxide; or tetrabutylammonium fluoride. When a methyl halide is employed as the methylating agent, the reaction may aiso be carried out in the presence of an acid scavenger 30 such as propylene or ethylene oxide. The reaction may conveniently be effected at temperatures 30 of from 0 to 60°C, preferably 20 to 40°C.

The compound of formula (XI) may be prepared by any of the processes (A)-(E) described herein, or as described in UK Published Patent Application No. 212421 OA.

According to a further general process (F), the compound of formula (I) may be prepared by 35 dealkylation of a quaternary ammonium salt of formula (XII): 35

H\.

40 «

NSDiCHj,

/

„ CH,

®/ 3

CHjCHjN—R,5 E© tffl! \kj

40

(wherein RIS represents a methyl group or -CHjCHjR^ where R,6 is an electron-withdrawing group, and E'-1 is an anion e.g. a halide ion).

45 Electron-withdrawing groups R15 include -S03Ra, -CO/, C0Ra, CHO and CN, where Ra is a 45 hydrocarbyl group, e.g. an alkyl, aryl or aralkyl group. R16 is preferably a phenoxysulphonyl group.

Where R,5 represents a methyl group the dealkylation may be effected by heating the compound (XII) in aqueous ethanolamine, at a temperature in the range 50 to 200°C. A group 50 -CH2CH2R16 may be removed by treatment with a base such as an alkali metal carbonate, e.g. 50 sodium carbonate or an alkali metal hydroxide e.g. sodium hydroxide.

Compounds of formula (XII) where R15 represents a methyl group may be prepared by alkylating the 3-aminoethyl or 3-methylaminoethyl compound corresponding to compound (I), for example as described for general process (E).

55 Compounds of formula (XII) in which R1S represents the group -CH2CH2R16 may be prepared 55 by reacting the corresponding 3-aminoethyl or 3-methylaminoethyl compound with a compound of formula (XIII);

H2C = CHR16 (XIII)

60 60

where R,6 is as previously defined, followed by alkylation of the product as previously described. Reaction with the compound of formula (XIII) may be effected for example in an aqueous medium and at a temperature in the range 0-50°C.

The compound of formula (I) may also be prepared according to a further general process (G), 65 which comprises dehydrogenation of the corresponding indoline of formula (XIV): 65

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fh

NSOjCH,. -CHjCHjN [Ml

/ xxx v-

5 S

The dehydrogenation process may be carried out in conventional manner either catalytically or using a suitable oxidising agent.

Oxidising agents which may be used in this process include quinones, e.g. 2,3-dichloro-5,6-10 dicyano-1,4- benzoquinone or 2,3,5,6-tetrachloro-1 r4-benzoquinone; and manganese dioxide. Catalytic dehydrogenation of the indoline (XIV) may be effected using for example a palladium, platinum or nickef catalyst, such as palladium on charcoal, finely divided palladium, platinum oxide or Raney nickel.

When an oxidising agent is employed the dehydrogenation reaction may be effected in an 15 aqueous or non-aqueous reaction medium. Solvents which may be used include hydrocarbons e.g. benzene or xylene; amides e.g. N,N-dimethylformamide; ethers e.g. tetrahydrofuran or dioxan; alcohols e.g. methanol or ethanol; halogenated hydrocarbons e.g. dichloromethane; and water, or mixtures thereof. The reaction may be effected at temperatures in the range — 50 to + 150°C. Catalytic dehydrogenation may be effected in the presence or absence of a solvent, 20 and generally at high temperatures, for example in the range 100 to 300°C. Solvents which may be used thus include inert high-boiling solvents, such as high-boiling hydrocarbons e.g. xylene or isopropyltoluene; and high-boiling ethers, e.g. phenylether. It will be appreciated that the precise reaction conditions will depend upon the oxidising agent or dehydrogenation catalyst used.

25 The indoline of formula (XIV) may be prepared for example by reduction of the corresponding oxindole, using for example lithium aluminium hydride in a solvent such as an ether e.g. diethyl ether or tetrahydrofuran. The oxindole may be prepared from a compound of formula (XV):

30 »SD,CH, ^ ,JJ,

UMv™

H

by reduction, for example with hydrogen in the presence of a metal catalyst such as palladium 35 on charcoal, and decarboxylation, e.g. in the presence of quinoline, to give the corresponding 3-cyanomethyl oxindole, followed by reduction in the presence of dimethylamine as described previously for general process (C). The compound of formula (XV) may itself be prepared in conventional manner for example by reacting the aniline of formula (XVI):

40 '\

/

NHj

45 with chloral and hydroxylamine to give an oximinoanilide, cyclising this by treatment with sulphuric acid, and condensing the resulting isatin with cyanoacetic acid in the presence of a base such as triethylamine and in a suitable solvent e.g. dioxan.

According to another general process (H) the compound of formula (I) according to the invention, or a salt thereof, may be prepared by subjecting a protected derivative of the 50 compound of general formula (I) or a salt thereof to a reaction to remove the protecting group or groups.

Thus at an earlier stage in the reaction sequence for the preparation of a compound of general for (I) or a salt thereof it may have been necessary or desirable to protect any sensitive groups in the molecule to avoid undesirable side reactions. For example, it may be necessary to protect 55 the indole nitrogen with, for example, an aralkyl group such as benzyl.

Subsequent cleavage of the protecting group may be achieved by conventional procedures. Thus an aralkyl group such as benzyl, may be cleaved by hydrogenolysis in the presence of a catalyst (e.g. palladium on charcoal) or sodium and liquid ammonia.

As will be appreciated, in some of the general processes (A) to (G) described previously it may 60 be necessary or desirable to protect any sensitive groups in the molecule as just described.

Thus, a reaction step involving deprotection of a protected derivative of general formula (I) or a salt thereof may be carried out subsequent to any of the previously described processes (A) to (G).

Thus, according to a further aspect of the invention, the following reactions in any appropriate 6 5 sequence, may if necessary and/or desired be carried out subsequent to the processes (A) to

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(G):-

(i) removal of any protecting groups; and

(ii) conversion of the compound of formula (I) or a salt thereof into a physiologically acceptable salt or solvate (e.g.hydrate) thereof.

5 Where it is desired to isolate the compound of formula (I) as a physiologically acceptable salt, for example as an acid addition salt, this may be achieved by treating the free base of formula (I) with an appropriate acid (e.g. succinic or hydrochloric acid) preferably with an equivalent amount in a suitable solvent (e.g. aqueous ethanol).

As well as being employed as the last main step in the preparative sequence, the general 10 methods indicated above for the preparation of the compounds of the invention may also be used for the introduction of the desired groups at an intermediate stage in the preparation of the required compound. Thus, for example, the methylaminosulphonylmethyl group at the 5-position may be formed either before or after cyclisation to give the indole nucleus. It should therefore be appreciated that in such multi-stage processes, the sequences of reactions should 1 5 be chosen in order that the reaction conditions do not affect groups present in the molecule which are desired in the final product.

The following examples illustrate pharmaceutical formulations according to the invention, containing 3-[2-(dimethylamino)ethyl]-N-methyl-1 H-indole-5-methanesulphonamide succinate (1:1) as the active ingredient. In these examples the weight of the active ingredient is the weight 20 of the succinate.

TABLETS FOR ORAL ADMINISTRATION A. Direct Compression

mg/tablet for 40g mix

Active ingredient

49

15.08g

Magnesium Stearate BP

0.65

0.20g

Anhydrous Lactose

81

24.92g

The active ingredient was sieved and blended with the anhydrous lactose and magnesium stearate. The resultant mix was compressed into tablets using a Manesty F3 tablet machine fitted with 8.0mm concave punches.

35

mg/tablet for 40g mix

Active ingredient

49

14.0g

Magnesium Stearate BP

0.7

0.20g

Microcrystalline Cellulose NF

91

26.Og

The active ingredient was sieved and blended with the microcrystalline cellulose and 45 magnesium stearate. The resultant mix was compressed into tablets using a Manesty F3 tablet machine fitted with 8.0mm concave punches.

B. WET GRANULATION

50 mg/tablet

Active ingredient 7.0

Lactose BP 146.5

Starch BP 30.0

55 Pregelatinised Maize Starch BP 15.0

Magnesium Stearate BP 1.5

Compression weight 200.0

60

The active ingredient is sieved through a suitable sieve and blended with lactose, starch and pregelatinised maize starch. Suitable volumes of purified water are added and the powders are granulated. After drying, the granules are screened and blended with the magnesium stearate. The granules are then compressed into tablets using suitable diameter punches.

65 Tablets of other strengths may be prepared by altering the ratio of active ingredient to lactose

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or the compression weight and using punches to suit.

The tablets may be film coated with suitable film-forming materials, such as hydroxypropyl methylcellulose, using standard techniques. Alternatively the tablets may be sugar coated, or enteric coated.

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CAPSULES

mg/capsule

10 Active ingredient 59.00

•Starch 1500 150.00

Magnesium Stearate BP 1.00

Fill Weight 200.00

15

*A form of directly compressible starch.

The active ingredient is sieved and blended with the excipients. The mix is filled into size No. 2 hard gelatin capsules using suitable machinery. Other doses may be prepared by altering the 20 fill weight and if necessary changing the capsule size to suit.

SYRUP

Sucrose Free Presentation mg/5ml dose

25

Active Ingredient 49.00 Hydroxypropylmethylcellulose USP

(viscosity type 4000) 22.5 Buffer )

30 Flavour )

Colour ) as required

Preservative )

Sweetener )

35 Purified Water BP to 5.0m!

The hydroxypropylmethylcellulose is dispersed in hot water, cooled and then mixed with an aqueous solution containing the active ingredient and the other components of the formulation. 40 The resultant solution is adjusted to volume and mixed. The syrup is clarified by filtration.

SUSPENSION

mg/5mi dose

Active ingredient

49.00

Aluminium monostearate

75.00

Sweetening agent

)

Flavour

) as required

Colour

)

Fractionated coconut oil to

5.00ml

The aluminium monostearate is dispersed in about 90% of the fractionated coconut oil. The 55 resulting suspension is heated to 115°C while stirring and then cooled. The sweetening agent, flavour and colour are added and the active ingredient is suitably dispersed. The suspension is made up to volume with the remaining fractionated coconut oil and mixed.

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SUB-LINGUAL TABLET

mg/tablet

Active Ingredient

49.00

Compressible Sugar NF

50.5

Magnesium Stearate BP

0.5

Compression Weight

100.0

The active ingredient is sieved through a suitable sieve, blended with the excipients and compressed using suitable punches. Tablets of other strengths may be prepared by altering either the ratio of active ingredient to excipients or the compression weight and using punches 15 to suit. 1 5

SUPPOSITORY FOR RECTAL ADMINISTRATION

Active ingredient 49.0mg

20 'Witepsol H15 to 1.0g 20

*A proprietary grade of Adeps Solidus Ph. Eur.

A suspension of the active ingredient in molten Witepsol is prepared and filled, using suitable 25 machinery, into 1g size suppository moulds. 25

INJECTION FOR INTRAVENOUS ADMINISTRATION

mg/ml

30 30

Active Ingredient 0.896

Sodium Chloride Intravenous

Infusion, BP, 0.9% w/v to 1 ml

Batch Size 2500ml 35 35

The active ingredient was dissolved in a portion of the Sodium Chloride Intravenous Infusion, the solution made to volume with the Sodium Chloride Intravenous Infusion, and the solution thoroughly mixed. The solution was filled into clear, Type 1, glass 10ml ampoules and sealed 40 under a nitrogen headspace by fusion of the glass. The ampoules were sterilised by autoclaving 40 at 121 °C for not less than 15 minutes.

FOR INHALATION

*

Inhalation Cartridges

mg/cartridge

Active ingredient (micronised)

0.56

Lactose BP

25.00

The active ingredient is micronised in a fluid energy mill to a fine particle size range prior to blending with normal tabletting grade lactose in a high energy mixer. The powder blend is filled into No. 3 head gelatin capsules on a suitable encapsulating machine. The contents of the 55 cartridges are administered using a powder inhaler such as the Glaxo Rotahaler. 55

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Metered Dose Pressurised Aerosol

Suspension Aerosol mg/metered dose

Per can

Active ingredient (micronised)

0.280

73.92mg

Oleic Acid BP

0.020

5.28mg

Trichlorofluoromethane BP

23.64

5.67g

Dichlorodifluoromethane BP

61.25

14.70g

The active ingredient is micronised in a fluid energy mill to a fine particle size range. The oleic acid is mixed with the trichloromethane at a temperature of 10-15°C and the micronised drug is mixed into the solution with a high shear mixer. The suspension is metered into aluminium 15 aerosol cans and suitable metering valves, delivering 85mg of suspension are crimped onto the cans and the dichlorodifluoromethane is pressure filled into the cans through the valves.

Nasal Spray

20 % w/v

Active Ingredient

7.0

Preservative as required

Sodium Chloride BP

Purified Water BP to

100

Shot Weight

100mg (equivalent to 7mg

active ingredient)

30

The active ingredient, preservative and sodium chloride are dissolved in a portion of the water, the solution made to volume with the water and the solution thoroughly mixed.

The pH may be adjusted, using acid or alkali, to that of optimum stability and/or to facilitate solution of the active ingredient. Alternatively, suitable buffer salts may be used. 35 The invention is further illustrated by the following examples. All temperatures are in °C. 'Hyflo' is a filtration aid. "Reactivials" are 4ml stout-walled glass vials with a screw cap and teflon-faced disc, supplied by Pierce and Warriner (UK) Ltd. Chromatography was carried out either in the conventional manner using silica gel {Merck, Kieselgel 60, Art. 7734) or by 'flash' chromatography (W.C. Still, M. Kahn and A. Mitra, J. Org. Chem., 2923, 43, 1978) on silica 40 (Merck 9385) and thin layer chromatography (t.l.c.) on silica Macherly-Nagel, Polygram) except where otherwise stated. The following abbreviations define the eluent used for chromatography and t.l.c.:—

(A) Ethyl acetate-isopropanol-water-0.88 ammonia 25:15:8:1

(B) Methylene chloride-ethanol-0.88 ammonia 100:8:1 45 (C) Ether

(D) Methylene chloride-ethanol-0.88 ammonia 20:8:1

(E) Methylene chloride-ethanol-0.88 ammonia 200:8:1

(F) Methylene chloride-ethanol-0.88 ammonia 50:8:1

(G) Ethanol-ethyl acetate-0.88 ammonia-water 25:15:2:2 50 (H) lsopropanol-chloroform-water-0.88 ammonia 25:15:2:2

(I) Methylene chloride-ethanol-0.88 ammonia 89:10:1

(J) Methylene chloride-methanol 97:3

(K) Ethyl acetate-hexane 60:40

(L) Methylene chloride-methanol 95:5 55 (M) Ether-hexane 4:1

(N) Methylene chloride-ethanof-0.88 ammonia 25:8:1

(O) Acetic acid-ethyl acetate 1:99

(P) Methylene chloride-ethanol-0.88 ammonia 150:8:1

Intermediates were routinely checked for purity by t.l.c. employing u.v. light for detection and 60 spray reagents such as potassium permanganate (KMn04). In addition indolic intermediates were detected by spraying with aqueous eerie sulphate Ce,v) and tryptamines by spraying with a solution of iodoplatinic acid (IPA) or eerie sulphate. Proton ('H) nuclear magnetic resonance (n.m.r.) spectra were obtained either at 90MHz using a Varian EM390 instrument or at 250MHz using a Bruker AM or WM 250 instrument, s = singlet, d = doublet, t = triplet, 65 q — quartet and m = multiplet.

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Preparation 1

(i) N-Methyl-4-[2-[2-(phenylthio)ethylidene]hydrazino]benzenemethane-sulphonamide

A solution of (phenylthio)acetaldehyde (6.05g) in absolute ethanol (180ml) was added over 5 10 min to a solution of 4-hydrazino-A/-methylbenzenemethanesulphonamide hydrochloride (10g) in water (180ml) with cooling. After addition of the aldehyde was complete, the mixture was stirred at 5° for a period of 14h. The precipitated solid was filtered off, washed with water (200ml), hexane (200ml) and dried in vacuo to give the title compound (10.95g), m.p. 110-112°. T.l.c. (B) Rf 0.5 (KMn04)

10

(ii) N-Methyl-3-(phenylthio)-1 H-indole-5-methanesulphonamide

A solution of the product of stage (i) (5g) in absolute ethanol (300ml) was saturated with hydrogen chloride gas (ca. 30 min) whilst being cooled in an ice-water bath, allowed to stir at ambient temperature for a period of 3h and then filtered. The filtrate was concentrated in vacuo 15 and chromatographed (flash, E) to afford a foam, which solidified on trituration with ether to an amorphous powder (2.17g). A sample was recystallized from hexane-dichloromethane to give the title compound, m.p. 133-134°. T.l.c. (B) Rf 0.5 (KMn04)

(iii) N-Methyl-1 -H-indole-5-methanesulphonamide

20 To a solution of the product of stage (ii) (460mg) in absolute ethanol (50ml) was added Raney Nickel [4.6g, 50% slurry in water, washed to neutrality with deionized water (60ml)] and the reaction mixture refluxed for a total of 16h under an atmosphere of nitrogen. On cooling to ambient temperature, the supernatant was removed and the Raney Nickel extracted with ethanol (2 X 50m!, which was brought to a gentle reflux for 1 5min under an atmosphere of N2). The 25 combined extracts were filtered through a sand-celite pad and concentrated in vacuo. Chromatography of the residue (flash, E), afforded an oil (87mg) which crystallised from ether-hexane to give the title compound (90mg), m.p. 127-129°. T.l.c. (B) Rf 0.50 (KMn04)

Preparation 2

30 5-[[(Methylamino)sulphonyl]methyl]-1 H-indole-3-acetic acid

3-(Cyanomethy!)-N-methyl-1 H-indole-5-methanesulphonamide (1.0g) was heated under reflux with stirring under nitrogen with potassium hydroxide (4.5g) in water (15 ml) and ethanol (25ml) for 16h. The ethanol was evaporated at reduced pressure, and the aqueous residue diluted with water (20ml) and washed with ethyl acetate (2 X 30ml). The aqueous layers were 35 acidified with 2N hydrochloric acid (50ml) and extracted with ethyl acetate (3 X 50ml); the latter organic layers were washed with brine, dried (MgS04) and evaporated to give an oil (1.25g). Trituration with dry ether gave the title compound as a solid (0.767g) m.p. 126-133°. T.l.c. (0), Rf 0.7 (CelV)

40 Preparation 3

3-[2-(Dimethylamino)ethyl]~2.3-dihydro-N-methyl-1 H-indole-5-methanesulphonamide

To a suspension of 3-[2-(dimethylamino)ethyl]-N-methyl-1 H-indole-5-methanesulophonamide (0.5g) in trifluoacetic acid (15ml) at — 10° was added borane-tetrahydrofuran complex (45ml; 1M) keeping the temperature below + 2°. The resulting suspension was stirred at 0° for 5 min, 45 poured onto saturated potassium carbonate (50ml) and extracted with ethanol (2 X 20ml). The ethanolic extract was evaporated and the residue purified by column chromatography (A) to give the title compound as an oil (80mg). T.l.c. (N), Rf 0.53 (IPA, Ce'v).

Unless otherwise indicated the following examples illustrate the preparation of 3-[2-dimethy-lamino)ethyl]-N-methyl-1 H-indole-5-methane sulphonamide and salts thereof.

50

Example 1

Compound with succinic acid (2:1) (hemisuccinate)

A solution of 3-(cyanomethyl)-N-methyl-1 H-indole-5-methanesulphonamide (16.5g) in methan-eolic dimethylamine (200ml, 15% w/w) and ethanolic dimethylamine (300ml, 33% w/w) was 55 hydrogenated at room temperature over pre-reduced palladium oxide on charcoal (10%, 16g) in ethanol (100ml) for 24h. The suspension was filtered through hyflo and evaporated in vacuo to give a solid (16g) which was triturated with diethyl ether (500ml). The solid (13.5g) was collected by filtration and dissolved in hot absolute ethanol (200ml) and filtered. To the hot filtrate was added a solution of succinic acid (2.7g) in methanol (50ml). The crystals that formed 60 were removed by filtration to give the title compound (12.2g) m.g. 1 58-159°.

Analysis Found: C,54.0;H,6.7;N, 11.7.

(C14H2lN302S)2,C4H604 requires C,54.2;H,6.8;N, 11.9%.

'H n.m.r. S(DMS0-d6), 2.37(2H,s,CH2C02H),2.40[6H,s,N(CH3)2], 2.58(3H,s,NHCH3) 2.7-3.0 (4H,m,CH2CH2N), 4.38 (2H,s,CH2S02),6.85 (1H,brs, NHCH3, and aromatic signals at 7.11 65 (1 H,brd), 7.22(1 H,brs), 7.36(1 H,d), 7.55(1 H,brs) and 10.94(1 H,brs)

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Example 2

Compound with succinic acid (1:1)

A solution of 3-(2-aminoethyI)-N-methyl-1 W-indole?-5-methanesulphonamide (2g) and sodium 5 cyanoborohydride (0.564g) in methanol (37.5ml) and acetic acid (2.246g) was treated at ca. 12° with a solution of 36%w/v aqueous formaldehyde (1.25ml) in methanol (8.85ml). The resulting solution was stirred at 22° for 2h, followed by the addition of 2N sodium hydroxide solution (6.5ml) and sodium borohydride (0.1g). 2IM hydrochloric acid (7ml) was added to the reaction mixture which was then evaporated free of methanol, and diluted with water (to 25ml). 10 Solid potassium carbonate was added to pH 7, the solution was washed with ethyl acetate and the ethyl acetate extracts were washed with water. The aqueous layer and washings were combined, saturated with potassium carbonate and extracted with ethyl acetate. The ethyl acetate extracts were dried (MgS04) and evaporated to a solid residue (1.8g). 1,67g of the residue was recrystallised from isopropanol (16.7ml) to give 1.307g, of crystalline base, 1.297g 15 of which was dissolved in IMS (13ml) and treated with a hot solution of succinic acid (0.518g) in IMS (13ml). The resulting solution was cooled and the precipitated solid filter and dried to give title compound (1.737g) m.p. 165-166°. The n.m.r. and t.l.c. [(G), Rf (IPA)] were in agreement with the product of Example 1.

20 Example 3

3-[2-(Dimethylamino)ethyl]-N-methyl-1 H-indole-5-methanesulphonamide (Base)

Solutions of sodium borohydride (7.1 g) in water (100ml) and formalin (36% w/v,50ml) in methanol (50ml) were added to a solution of 3-(2-aminoethyl)-/V-methyl-1 W-indole-5-methanesul-phonamide (10g Jin methanol (200ml) at 15—21° during 0.75h. Hydrochloric acid (2N, 75ml) 25 was added and the mixture concentrated in vacuo to 150ml. Further hydrochloric acid (2N, 50ml) was added. The mixture was basified with potassium carbonate (60g) and extracted with ethyl acetate (2X150ml). The combined extracts were dried (MgS04) and concentrated in vacuo to give the title compound (10.7g) as a solid m.p. 169-171°. T.l.c. (G), Rf 0.5 (u.v.) and n.m.r. spectrum were in agreement with the product of Example 1.

30

Example 4

(i) N,N,-Dimethyl-5-[2-[(methylamino)sulphonyl]methyl]-G-oxo-1 H-indole-3-acetamide

Oxalyl chloride (0.112ml) was added to a stirred solution of N-methyl-1 H-indole-5-methane-sulphonamide (270mg) contaminated with phthalimide (ca. 40% w/w) in dry tetrahydrofuran 35 under nitrogen, and stirring was continued at room temperature for 1.75h. Gaseous dimethylamine was bubbled through the reaction mixture for 1 5min, and stirring was continued at room temperature for a further 1 5min. The mixture was poured into 2N hydrochloric acid (50ml) and extracted with ethyl acetate (3 X 20ml); the organic layers were washed with brine, dried (MgS04) and evaporated to give a foam (222mg). Purification by flash chromatography (J) gave 40 the title compound as a solid (126mg) m.p. 157-159°. T.l.c. (L) Rf 0.15 (u.v.)

(ii) 3-[2-(Dimethylamino)ethyl]-N-methyl-1 H-indole-5-methane-sulphonamide

The product of Stage (i) (77mg) was heated under reflux with lithium aluminium hydride (90mg) in dry tetrahydrofuran (1 5ml) with stirring under nitrogen for 4h. After cooling to room 45 temperature, water (0.09ml) was cautiously added under nitrogen, followed by 2N aqueous sodium hydroxide (0.18ml) and more water (0.18ml). The precipitate was filtered off, and the filtrate evaporated to give an oil (53mg) which was shown by its n.m.r. spectrum and t.l.c. to be identical with the product of Example 1.

50 Example 5

(i) 3-(Chloroacetyl)-N-methyl-1 H-indole-5-methanesulphonamide

To N,N-diethyl chloroacetamide (800mg) at 0° was^added phosphorous oxychloride (250/xl) over a period of 30 sec. After the addition was complete, the mixture was allowed to stir at 0° for 15 min and then at room temperature for 20 min. The product of Preparation 1 (300mg) 55 was added at 0° and the mixture warmed to 65°, whereupon it dissolved. The mixture was stirred for 2h at this temperature then poured onto ice (ca. 5g) and chloroform (5ml) and stirred vigorously for 1h. A solid was filtered off, washed with water (50ml), and hexane (100ml) and dried in vacuo to give the title compound (192mg)

T.l.c. (B) Rf 0.42 (KMn04)

60 'H n.m.r. fi(DMS0-d6), 2.58(3H,d,NHCH3), 4.45(2H,s,CH2S02), 4.92(2H,s,CH2CI),

6.88(1 H,q,NH) and aromatic signals at 7.29 (1H,dd), 7.54(1 H,d), 8.23(1 H,brs), 8.50(1 H,d) and 12.30(1 H,brs,indole NH)

(ii) 3-[(Dimethylamino)acetyl]-N-methyl-1 H-indole-5-methanesulphonamide

65 A solution of the product of stage (i) (160mg) in ethanolic dimethylamine (30ml, 33% w/v

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solution in ethanol) was heated to reflux for a period of 2h. On cooling to ambient temperature the solvent was removed in vacuo and the residue was chromatographed (B) to afford the title compound (55mg) m.p. 230° (decomp.)

T.l.c. (B) Rf 0.14 (IPA)

5

(iii) 3-[2-(Dimethylamino)ethyl]-N-methyl-1 H-indole-5-methanesulphonamide

To a suspension of the product of stage (ii) (46.5mg) in 1-propanol (5ml) was added sodium borohydride (62mg). The reaction mixture was brought to reflux for a period of 3h, then an additional quantity of borohydride (60mg) was added. After refluxing for a further 1h, the 10 mixture was allowed to cool to ambient temperature and quenched with 2N HCI (10ml). The aqueous solution was washed with ethyl acetate (5ml) then neutralized (satd. NaHC03 solution) and extracted with ethyl acetate (3x15ml). The combined extracts were dried (MgS04) and concentrated in vacuo and the residue chromatographed (F) to give the title compound as a gum (2mg) which was shown by t.l.c. [(F), RF 0.34, (KMn04)] and n.m.r. to be identical with the 15 product of Example 1.

Example 6

(i) N, N-Dimethyl-5-[[(methyiamino)sulphonyl]methyl]-1 H-indole-3-acetamide

To a solution of the product of Preparation 2 (0.3 g) in tetrahydrofuran (20ml) was added 20 1,1 '-carbonyldiimidazole (0.24g) and stirred at room temperature for 1 h. It was then treated with tetrahydrofuran (20ml) saturated with dimethylamine and then left at ambient temperature for 16h. The resulting suspension was treated with concentrated ammonium hydroxide (d 0.88; 1 ml), the solvent evaporated and the residue purified by column chromatography (B). The title compound was obtained as an amorphous solid (0.18g) T.l.c. (B) Rf 0.4 (Celv).

25 'H n.m.r. 5(DMSO-d6), 2.56(3H,d,NHMe), 2.84 & 3.04(6H,s + s, CON/We2),

3.74(2H,s,CW2C0), 4.33(2H,s,CH2S02). 6.81 (1 H,q,NHMe), and aromatic signals at 7.11 (1 H,dd), 7.23(1 H,d), 7.35(1 H,d), 7.57(1 H,brs) and 11.00(1 H,brs, indole NH)

(ii) 3-[2-(Dimethylamino)ethyi]-N-methyl-1 H-indole-5-methanesulphonamide

30 To a mixture of lithium aluminium hydride (0.2g) in dry tetrahydrofuran (10ml) was added the product of stage (i) (0.17g) and the resulting mixture heated at reflux for 16h. The excess of lithium aluminium hydride was destroyed by water (2ml), the reaction mixture partitioned between saturated potassium carbonate (10ml) and ethanol (10ml), and the ethanol layer evaporated to dryness. The residue was purified by column chromatography (F) to give the title 35 compound as an oil (0.1 2g) which was shown by n.m.r. and t.l.c. to be identical with the product of Example 1.

Example 7

(i) Phenylmethyl methyl[2-[5-[[(methylamino)sulphonyl]methyl]-1 H-indol-3-yl] ethyljcarbamate 40 To a cold (ice bath) solution of N-methyl-3-[(2-methylamino)ethyl]-1 H-indole-5-methanesulpho-

namide (0.55g) in sodium carbonate (2N; 15ml) and tetrahydrofuran (10ml) was added benzylchloroformate (0.3ml) and the resulting suspension stirred at room temperature overnight. It was then poured onto ice, extracted with dicKloromethane (3 X 30ml), and the extracts dried (MgS04) and concentrated. The residue was purified by volumn chromatography (C) to give the 45 title compound as a foam (0.58g)

T.l.c. (C) Rf 0.3 (Ce'v, KMn04).

'H n.m.r. S(DMS0-de at 330K), 2.58(3H,s,NH/We) 2.93{3H,s,N-/We), 2.98(2H,m.NCH2CHa), 3.60(2H,m,NCH2CH2), 4.35(2H,s,CH2S02), 5.12(2H,s,CH2Ph), 6.59(1 H,brs, WHCH3), and aromatic signals at 7.1 -7.2(2H,m), 7.3-7.5(6H,m), 7.58(1 H,brs) and 10.80(1 H,brs, indole 50 NH)

(ii) 3-[2-(Dimethylamino)ethyl]-N-methyl-1 -H-indole-5-methanesulphonamide

A mixture of the product of stage (i) (0.2g) and lithium aluminium hydride (0.3g) in dry tetrahydrofuran (50ml) was heated at reflux for 6h then cooled and the excess of lithium 55 aluminium hydride decomposed by addition of water (5ml). The resulting suspension was saturated with solid potassium carbonate and extracted with ethanol (2 X 30ml). The solvent was evaporated and the residue purified by column chromatography (F) to give an oil (67mg) which was shown by n.m.r. and t.l.c. [(D), Rf p.5] to be identical with the product of Example 1.

60

Example 8

Compound with succinic acid (2:1}

(i) 4-[2-[4-(Dimethylamino)butylidene]hydrazino]-N-methylbenzenemethanesulphonamide 4,4-Dimethoxy-/V,/V-dimethylbutanamine (8.32g) was added to a stirred suspension of 4-65 hydrazino-W-methylbenzenemethanesulphonamide hydrochloride (1 Og) in water (25ml) and 2N

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hydrochloric acid (5ml). Further 2N hydrochloric acid (15ml) was added to give a solution (pH 1.5-2) which was stirred for 2.5h at room temperature. Chloroform (150ml) was added followed by 2N sodium carbonate solution (150ml) in 25ml aliquots. The layers were separated and the aqueous layer was further extracted with chloroform (150mf). The combined organic 5 extracts were dried (MgSOJ and concentrated in vacuo to give the title compound as a foam (12.4g). T.l.c. alumina, (E), Rf 0.45.

ii) 3-[2-(Dimethylamino)ethyl]-N-methyl-1H-indole-5-methanesulphonamide, compound with succinic acid (2:1)

10 A mixture of polyphosphate ester (20g) and the product of Stage (i) (4g) in chloroform (80ml) was stirred at room temperature for 4h. The reaction mixture was extracted with water (2 X 100ml), the aqueous extracts washed with chloroform (50ml), then basified to pH 11 with solid potassium carbonate and extracted with ethyl acetate (3X100ml). The combined organic extracts were dried (MgS04) and concentrated in vacuo to leave a foam (2.5g), which was

1 5 chromatographed (F) to give the tryptamine as an oil (1 -13g) which slowly crystallised on standing. Succinic acid (0.22g) in hot methanol (4ml) was added to a hot solution of the tryptamin (1.1g) in absolute ethanol (21ml) and the mixture was heated to reflux with stirring to give a solution. The solution was allowed to cool with stirring to room temperature, and the resultant suspension was further cooled in an ice-bath for 2h. The solid was filtered off, washed

20 with ethanol (25ml), and dried in vacuo to give the title compound (0.83g), m.p. 1 52-155°C which was shown from its n.m.r. spectrum and t.l.c. [(D), Rf 0.5, (1PA)] to be identical with the product of Example 1.

Example 9

25 (i) 3-(2-Hydroxyethyl)-N-methyl-1 H-indole-5-methanesulphonamide

A mixture of the product of Preparation 2 (0.5g) and lithium aluminium hydride (1g) in dry tetrahydrofuran was heated at reflux for 16 h. The excess of the hydride was destroyed with water (2ml) and the resulting suspension partitioned between saturated potassium carbonate (10ml) and ethanol (10ml). The organic layer was evaporated to dryness and the residue

30 purified by column chromatography (B) to give the title compound as a solid (0.2). T.l.c. (P) Rf 0.2 (KMn04, Celv)

'H n.m.r. S(DMS0-d6), 2.56(3H,d,NH/We), 2.87(2H,m,CH2CH2OH), 3.67(2H.m,CH2CH2OH), 4.37(2H,s,CW2S02), 6.81(1 H,m,A/WMe), and aromatic signals between 7.09 and 10.90.

35 (ii) 3-[2-(Dimethylamino)ethyl]-N-methyl-1 H-indoie-5-methane-suiphonamide

To a cold solution of the product of stage (i) (70mg) in pyridine (2ml) (ice-salt bath) was added a cold solution of thionyl chloride (1 ml) in pyridine (3ml) (ice-salt bath) and the resulting solution stirred for 0.5h during which time temperature rose to + 10°. It ws then quenched with ice, acidified with conc. hydrochloric acid and extracted with dichloromethane (3 X 20ml).

40 Evaporation of the solvent gave 3-(2-chloroethyl)-A/-methyl-1 H-indole-5-methanesulphonamide as an oil (30mg) which was dissolved in ethanolic dimethylamine (33% w/v, 5ml) and heated in a reactivial for 4h at 100". Evaporation of the solvent gave an oil which was shown by t.l.c. [(F), Rf 0.35] to contain the product of Example 1.

In another experiment 3-(2-chloroethyl)-N-methyl-1 H-indole-5-methanesulphonamide was ob-

45 tained pure as an oil after chromatography (B)

'H n.m.r. 5(DMSO-d6), 2.60(3H,d,NH/We), 3.20(2H,m,CW2CH2CI), 3.90(2H,m,CH2CH2Cl), 4.40(2H,s,CH2S02), 6.87(1 H,brs,/VHMe), and aromatic signals between 7.1 5 and 11.08.

Example 10

50 Methylamine was bubbled through a solution of phenyl 3-[2-(dimethylamino)ethyl]-1 H-indole-5-methanesulphonate (0.223g) in anhydrous pyridine. The solution was then heated in an autoclave at 120° (oil bath temperature) for 16h. Pyridine was removed by rotary evaporation and the residual gum purified by chromatography (F). Evaporation of the appropriate fractions produced a partially crystalline gum (0.11g) which solidified on scratching to present a powder

55 (0.1g) m.p.

169-172° shown by n.m.r. and t.l.c. [(F), Rf 0.4 (IPA)] to be identical with the product of Example 1.

Example 11

60 A solution of 3-[2-(dimethyiamino)ethyl]-1 H-indole-5-methanesulphonamide in anhydrous tetrahydrofuran (THF) (5ml) was treated with tetra-n-butylammonium fluoride (1M in THF, 0.16ml) and stirred at room temperature for 25 min. Propylene oxide (0.01243ml) was added, followed by methyl iodide (0.005ml) and the solution stirred at room temperature. After 3h, t.l.c. [(N), Rf 0.7] showed the presence of the product of Example 1.

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Example 12

To a cold (ice bath) solution of N-methyl-3-[2-(methylamino)ethyl]-1 H-indole-5-methanesulpho-namide (0.3g) in ethanol (10ml) was added methyl iodide (0.07ml) and the resulting solution stirred at ambient temperature overnight. It was then acidified with dilute hydrochloric acid to 5 pH 1, extracted with ethyl acetate (25ml) and the acidic layer partitioned between saturated potassium carbonate (20ml) and ethanol (20ml). The ethanol layer was evaporated and the residue purified by column chromatography (F) to give an oil (30mg) which was shown by n.m.r. and t.l.c. [(D), Rf 0.5] to be identical with the product of Example 1.

10 Example 13

lodomethane (0.16ml) was added to a stirred mixture of 3-(2-amino-ethyl)-/V-methyl-1 H-indole-5-methanesulphonamide (0.2g) and sodium hydrogen carbonate (0.14g) in methanol (10ml). The mixture was stirred at 22° for 2h and at reflux for 16h. More iodomethane (0.5ml) was added and the mixture was stirred at reflux for 2h longer. The mixture was filtered, and the 1 5 solvent removed by distillation at reduced pressure to give an oil containing N,N,N-trimethyl-5-[[(methylamino)sulphonyl]methyl]-1 H-indole-3-ethanaminium iodide. 50% Aqueous ethanolam-ine (20ml) was added and the mixture was heated at reflux for 1h. The water was distilled off and the resulting solution was heated at 100° for 1h. Water (25ml), ethyl acetate (25ml) and anhydrous potassium carbonate (10g) were added. The mixture was shaken and allowed to 20 separate to give three phases. The uppermost ethyl acetate layer was collected, washed with water (5ml), dried (MgS04) and the solvent removed by distillation at reduced pressure to give the title compound as a gum (0.1g), shown by t.l.c. [(D) Rf 0.75 (IPA)] to be identical with the product of Example 1.

25 Example 14

To a solution of the product of Preparation 3 (40mg) in dioxan (20ml) was added 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (35mg) and the mixture heated at reflux for 2h. It was cooled, partitioned between saturated potassium carbonate (20ml) and ethanol (20ml), and the organic layer evaporated to an oil (10mg) which was shown by t.l.c. [(F), Rf 0.31] to contain 30 the product of Example 1.

Example 15

(i) 3-(Cyanomethyl)-N-methyl-1-(phenylmethyl)-1 H-indole-5-methanesulphonamide

3-(Cyanomethyl)-N-rnethyl-1 H-indole-5-methanesulphonamide (0.4g) was dissolved in re-dis-

35 tilled dimethylformamide (10ml) and treated with sodium hydride (0.132g, 80% dispersion in oil). After 0.5h the stirred suspension was cooled to — 30°C and treated with distilled benzyl chloride (0.1 9g). The mixture was allowed to warm to 10°, stirred for 1h and then poured onto ice (lOg). The suspension was filtered, and the solid collected and washed with water (20ml) and cyclohexane (30ml). The solid was purified by chromatography (M) and the appropriate 40 fractions were combined and concentrated in vacuo to 20ml, whereupon a solid crystallised out which was collected and dried to give the title compound (0.1 2g), m.p. 133-135°. T.l.c. (M), Rf 0.4, (KMn04).

(ii) 3-[2-(Dimethylamino)ethyl]-N-methyl-1-(phenylmethyl)-1 H-indole-5-methanesulphonamide 45 A solution of the product of Stage (i) (100mg) in ethanolic dimethylamine (3ml, 33% w/w)

was hydrogenated over pre-reduced dry 10% palladium oxide on carbon (100mg) in ethanol (10ml) for 4h at 21 °.

The catalyst was filtered off (hyflo) and the solvent evaporated in vacuo to give a gum (100mg) which was purified by chromatography (B) to give the title compound (0.85mg) as a 50 foam. T.l.c. (B) Rf 0.3

(iii) 3-[2-(Dimethylamino)ethyl]-N-methyl-1 H-indole-5-methanesulphonamide

To a stirred solution of sodium (ca. 15mg) in liquid ammonia (3ml) cooled to — 60° was added the product of Stage (ii) (75mg) in tetrahydrofuran (1ml) dropwise. After 5min methanol 55 (0.5ml) and ammonium chloride (0.2g) were added and the ammonia was evaporated at 40°. The mixture was concentrated in vacuo to give a solid (0.8g) which was purified by chromatography (F) to give the title compound (20mg) as a powder m.p. 160-165° which was shown by n.m.r. and t.l.c. [(F), Rf 0.4] to be identical with the product of Example 1.

60 Example 16

Compound with fumaric acid (2:1)

A hot solution of the produce of Example 3 (590.8mg) in IMS (7ml) was treated in a single portion, with a hot solution of fumaric acid (128mg) in IMS (8.0ml), and the mixture cooled to 25°. The resulting suspension was stirred with ice-cooling for 30min and filtered. The filter-cake 65 was washed with IMS (2ml) and dried in vacuo to give the title compound (619mg) m.p.

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204.5-206° (dec.).

Analysis Found: C,54.1 ;H,6.7;N,11.7.

(C14H21Na02S)2.C4H404 requires C,54.4;H,6.6;N,11.9%.

5 Example 17 5

Compound with benzoic acid

A hot solution of the product of Example 3 (590.8mg) in IMS (7ml) was treated in a single portion with a hot solution of benzoic acid (244mg) in IMS (2ml). The solution was allowed to cool to 25°. The resulting suspension was stirred under ice-cooling for 20min and filtered. The 10 filter cake was washed with IMS (0.5m!) and dried in vacuo to yield the title compound 10

(653mg) m.p. 173-175°

Analysis Found: C,60.3;H,6.6;N,9.9.

C14H21N302S.C7H602 requires: C,60.4;H,6.5;N,10.1%.

15 Example 18 15

Compound with methanesulphonic acid (1:1)

A solution of methanesulphonic acid (0.213g) in hot IMS (3ml) was added to a stirred solution of the product of Example 3 (0.597g) in hot IMS (9ml). The resulting stirred solution was allowed to cool to room temperature over 1 h, cooled in an ice bath for 20min, and the 20 mixture was then filtered. The title salt was obtained as a solid (0.642g), m.p. 186-188.5°. 20 Analysis Found: C,46.0;H,6.6;N,10.6.

C14H21N302S.CH403S requires C,46.0;H,6.4;N,10.7%.

T.l.c. (H) Rf 0.23 (trace impurity), 0.52; (IPA, Celv)

25 Example 19 25

Compound with succinic acid (1:1)

A hot clarified solution of succinic acid (1 -26g) in IMS (10ml) as added to a stirred clarified solution of the product of Example 3 (3.14g) in IMS (60ml) at 70°. Solid began to crystallise out almost immediately, and the mixture was allowed to cool to 30°. The stirred mixture was 30 further cooled in an ice-bath (45min). The solid was filtered off, washed with cold ethanol 30

(35ml) and dried in vacuo to give the title compound (4.17g) m.p. 164-165°. T.l.c. (D) Rf 0.7 (IPA, Ce,v).

'H n.m.r. and g.l.c. indicate the product contains 5.52% w/w ethanol (0.52mol)

Analysis Found: C,51,7;H,6.95;N,9.8.

35 C14H2,N302S.C4H604.0.52C2H60 requires C,52.25;H,6.95;N,9.6%. 35

Example 20

Compound with hydrogen chloride (1:1)

Concentrated hydrochloric acid (0.18ml) was added to a stirred solution of the product of 40 Example 3 (504mg) in IMS (4ml) at 65°. The mixture was allowed to cool to 25° when a solid 40 crystallised. Ice-cooling was applied and the solid was collected by filtration. The cake was washed with (IMS 2 X 1ml) and dried at reduced pressure to give the title compound (517mg) m.p. 214-215°. T.l.c. (G), Rf 0.47 (IPA)

Analysis Found: C,50.75;H,6.8;N,12.6.

45 C14H21N302S.HC1 requires C,50.5;H„6.7;N,12.7%. 45

Claims (10)

1. A compound of formula (I):

50 h3C^ ^2 50

■ XXX -

H

55 55

and its physiologically acceptable salts and solvates.

2. A compound according to claim, wherein the physiologically acceptable salt is an acid addition salt formed with an organic or inorganic acid.

3. A compound according to claim 2, wherein the physiologically acceptable salt is a

60 hydrochloride, hydrobromide, sulphate, nitrate, phosphate, formate, mesylate, citrate, benzoate, 60 fumarate, maleate or succinate.

4. A compound according to claim 3, wherein the physiologically acceptable salt is the 1:1 succinate.

5. A pharmaceutical composition comprising as active ingredient at least one compound

65 selected from a compound of formula (I) as defined in claim 1 and its physiologically acceptable 65

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salts and solvates together with at least one pharmaceuticaily acceptable carrier or excipient.

6. A pharmaceutical composition according to claim 5 which is formulated for oral administration to humans.

7. A pharmaceutical composition according to claim 6, which is formulated in unit dosage

5 form comprising 0.1 mg to 100 mg of active ingredient. 5

8. A pharmaceutical composition according to claim 7, which is formulated in unit dosage form comprising 2 mg to 40 mg of active ingredient.

9. A pharmaceutical composition according to claim 5, which comprises one or more other therapeutic agents selected from analgesics, anti-inflammatory agents and anti-nauseants.

10 10. A process for the preparation of a compound of formula (I): 10

/H3

NSOiCUJ . ^CH;CHjN (I)

/ * S \

15 H L II JJ CHj 15

H

or a physiologically acceptable salt or solvate thereof which comprises

(A) cyciising a compound of formula (II):

20 20

H3C

"SOjCH,

■ XX .

25 13 \ 25

chj or

(B) reacting a compound of general formula (V):

17.

30

35 (wherein Y is a readily displaceable group) 35

or a protected derivative thereof with dimethylamine; or

(C) reducing a compound of general formula (VIII):

HjC

40 NS0;CH2 ^ * 40

/ w h

(wherein W is a group capable of being reduced to form the dimethylaminomethyl group) or a 45 salt or protected derivative thereof; or 45

(D) reacting a compound of formula (IX):

50 XXf "'.n, 50

H

(wherein X represents a leaving atom or group) or a salt thereof 55 with methylamine; or 55

(E) reacting a compound of formula (XI):

HS0,CK- _.CK,CH;N 'Hi

60 / XtX v

H

(wherein Rt2, R13 and R14 each represents hydrogen or a methyl group, at least one of R12, R13 65 and R14 being hydrogen) 65

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with a methylating agent; or

(F) dealkylating a quaternary ammonium salt of formula (XII):

"3\ ©/3 5

b HSOoCHJ CH,CH,N—R« E© (21! °

' XXX '*>

H

10 (wherein R1S is a methyl group or the group -CH2CH2R16 where Rie is an electron-withdrawing 10 group and E© is an anion); or

(G) dehydrogenating an indoline of the formula (XIV):

15 \ /3 15

nso2Ch;1_-6__,CH,CH2N urn

H

20 or 20

(H) subjecting a protected derivative of the compound of formula (I) or a salt thereof to reaction to remove the protecting group or groups;

and if necessary or desired subjecting the resulting compound of formula (I) or a salt thereof to one or two further reactions comprising 25 (i) removing any protecting groups; and 25

(ii) converting the compound of formula (I) or a salt thereof into a physiologically acceptable salt or solvate thereof.

Printed in the United Kingdom for Her Majesty's Stationery Office, Dd 8818935. 1986, 4235.

Published at The Patent Office, 25 Southampton Buildings, London, WC2A 1 AY. from which copies may be obtained.

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