Beta d-crystalline form of ivabradine hydrochloride, a process for its preparation and pharmaceutical compositions containing it

Abstract

A βd-Crystalline form of ivabradine hydrochloride of formula (I): characterised by its powder X-ray diffraction data. Medicinal products containing the same which are useful as bradycardics.

Description

The present invention relates to the new βd-crystalline form of ivabradine hydrochloride of formula (I), to a process for its preparation and to pharmaceutical compositions containing it.

Ivabradine, and addition salts thereof with a pharmaceutically acceptable acid, and more especially its hydrochloride, have very valuable pharmacological and therapeutic properties, especially bradycardic properties, making those compounds useful in the treatment or prevention of various clinical situations of myocardial ischaemia such as angina pectoris, myocardial infarct and associated rhythm disturbances, and also in various pathologies involving rhythm disturbances, especially supraventricular rhythm disturbances, and in heart failure.

The preparation and therapeutic use of ivabradine and addition salts thereof with a pharmaceutically acceptable acid, and more especially its hydrochloride, have been described in the European patent specification EP 0 534 859.

In view of the pharmaceutical value of this compound, it has been of prime importance to obtain it with excellent purity. It has also been important to be able to synthesise it by means of a process that can readily be converted to the industrial scale, especially in a form that allows rapid filtration and drying. Finally, that form had to be perfectly reproducible, easily formulated and sufficiently stable to allow its storage for long periods without particular requirements for temperature, light or oxygen level.

The patent specification EP 0 534 859 describes a synthesis process for ivabradine and its hydrochloride. However, that document does not specify the conditions for obtaining ivabradine in a form that exhibits those characteristics in a reproducible manner.

The Applicant has now found that a particular salt of ivabradine, the hydrochloride, can be obtained in a crystalline form that is well defined and that exhibits valuable characteristics of stability and processability.

More specifically, the present invention relates to the βd-crystalline form of ivabradine hydrochloride, which is characterised by the following powder X-ray diffraction diagram measured using a PANalytical X'Pert Pro diffractometer together with an X'Celerator detector and expressed in terms of ray position (Bragg's angle 2 theta, expressed in degrees), ray height (expressed in counts), ray area (expressed in counts×degrees), ray width at half-height (“FWHM”, expressed in degrees) and interplanar distance d (expressed in Å):

	Angle		Area
	2 theta	Height	(counts ×	FWHM	Interplanar
Ray no.	(degrees)	(counts)	degrees)	(degrees)	distance (Å)
1	4.0	244	80	0.3346	22.139
2	5.9	377	56	0.1506	14.829
3	6.9	94	50	0.5353	12.835
4	9.2	1975	293	0.1506	9.623
5	11.8	136	27	0.2007	7.473
6	12.5	1826	241	0.1338	7.083
7	13.6	1834	303	0.1673	6.491
8	14.5	51	20	0.4015	6.119
9	16.0	1441	214	0.1506	5.525
10	17.3	4472	738	0.1673	5.134
11	18.4	546	108	0.2007	4.808
12	19.6	1025	169	0.1673	4.524
13	20.0	688	91	0.1338	4.448
14	20.4	1027	186	0.184	4.362
15	21.4	102	24	0.2342	4.143
16	22.3	1903	283	0.1506	3.990
17	22.8	674	89	0.1338	3.897
18	23.0	623	62	0.1004	3.866
19	24.4	845	56	0.0669	3.647
20	25.0	3749	557	0.1506	3.554
21	25.5	512	84	0.1673	3.497
22	26.6	289	76	0.2676	3.346
23	28.3	275	91	0.3346	3.151
24	29.1	126	21	0.1673	3.066

The invention relates also to a process for the preparation of the βd-crystalline form of ivabradine hydrochloride, which process is characterised in that a mixture of ivabradine hydrochloride and water or a mixture of ivabradine hydrochloride, isopropanol and water is heated until dissolution is complete and is then progressively cooled until crystallisation is complete, and the crystals thereby formed are collected and dehydrated.

• • In the crystallisation process according to the invention it is possible to use ivabradine hydrochloride obtained by any process, for example ivabradine hydrochloride obtained by the preparation process described in patent specification EP 0 534 859.
  • The solution may advantageously be seeded during the cooling step.

The invention relates also to pharmaceutical compositions comprising as active ingredient the βd-crystalline form of ivabradine hydrochloride together with one or more appropriate, inert, non-toxic excipients. Among the pharmaceutical compositions according to the invention, there may be mentioned more especially those that are suitable for oral, parenteral (intravenous or subcutaneous) or nasal administration, tablets or dragées, sublingual tablets, gelatin capsules, lozenges, suppositories, creams, ointments, dermal gels, injectable preparations, drinkable suspensions.

The useful dosage can be varied according to the nature and severity of the disorder, the administration route and the age and weight of the patient. That dosage varies from 1 to 500 mg per day in one or more administrations.

The following Examples illustrate the invention.

The X-ray powder diffraction spectrum was measured under the following experimental conditions:

• • PANalytical X'Pert Pro diffractometer, X'Celerator detector, temperature-regulated chamber,
  • voltage 45 kV, intensity 40 mA,
  • mounting θ-θ,
  • nickel (Kβ) filter,
  • incident-beam and diffracted-beam Soller slit: 0.04 rad,
  • fixed angle of divergence slits: ⅛°,
  • mask: 10 mm,
  • antiscatter slit: ¼°,
  • measurement mode: continuous from 3° to 30°, in increments of 0.017°,
  • measurement time per step: 19.7 s,
  • total time: 4 min 32 s,
  • measurement speed: 0.1080/s,
  • measurement temperature: ambient.

EXAMPLE 1

βd-Crystalline Form of Ivabradine Hydrochloride

720 ml of purified water are preheated to 50° C., and then 250 g of ivabradine hydrochloride obtained according to the process described in the patent specification EP 0 534 859 are added in portions, with stirring, and the mixture is heated at 74° C. until dissolution is complete. The resulting clear solution is heated for 2 more hours at 74° C. and is then progressively cooled, first to 40° C., and then to ambient temperature. The solution is subsequently stored at ambient temperature for 2 days, and then the solid suspension is spread out in a thin layer on a crystallisation plate. The excess water is driven off under a gentle current of nitrogen.

The product thereby obtained is dehydrated by progressively heating at a rate of 5° C./min up to a temperature of 80° C.

X-Ray Powder Diffraction Diagram

The X-ray powder diffraction profile (diffraction angles) of the βd-form of ivabradine hydrochloride is given by the significant rays collated in the following table

	Angle		Area
	2 theta	Height	(counts ×	FWHM	Interplanar
Ray no.	(degrees)	(counts)	degrees)	(degrees)	distance (Å)
1	4.0	244	80	0.3346	22.139
2	5.9	377	56	0.1506	14.829
3	6.9	94	50	0.5353	12.835
4	9.2	1975	293	0.1506	9.623
5	11.8	136	27	0.2007	7.473
6	12.5	1826	241	0.1338	7.083
7	13.6	1834	303	0.1673	6.491
8	14.5	51	20	0.4015	6.119
9	16.0	1441	214	0.1506	5.525
10	17.3	4472	738	0.1673	5.134
11	18.4	546	108	0.2007	4.808
12	19.6	1025	169	0.1673	4.524
13	20.0	688	91	0.1338	4.448
14	20.4	1027	186	0.184	4.362
15	21.4	102	24	0.2342	4.143
16	22.3	1903	283	0.1506	3.990
17	22.8	674	89	0.1338	3.897
18	23.0	623	62	0.1004	3.866
19	24.4	845	56	0.0669	3.647
20	25.0	3749	557	0.1506	3.554
21	25.5	512	84	0.1673	3.497
22	26.6	289	76	0.2676	3.346
23	28.3	275	91	0.3346	3.151
24	29.1	126	21	0.1673	3.066

EXAMPLE 2

Pharmaceutical Composition

Formula for the preparation of 1000 tablets each containing 5 mg of ivabradine base:

Compound of Example 1      5.39 g
Maize starch               20 g
Anhydrous colloidal silica 0.2 g
Mannitol                   63.91 g
PVP                        10 g
Magnesium stearate         0.5 g

Claims

1. A βd-Crystalline form of ivabradine hydrochloride of formula (I):

2. The βd-Crystalline form of ivabradine hydrochloride of claim 1 having a powder X-ray diffraction diagram exhibiting peaks at 9.2 and 13.6 deg 2 theta.

3. The βd-Crystalline form of ivabradine hydrochloride of claim 1 having a powder X-ray diffraction diagram exhibiting peaks at 9.2, 12.5, 13.6, 17.3, 22.3 and 25.0 deg 2 theta.

4. A pharmaceutical composition comprising as active ingredient the βd-crystalline form of ivabradine hydrochloride of claim 1, in combination with one or more pharmaceutically acceptable, inert, non-toxic carriers.

5. A method for treating or preventing a condition requiring a bradycardic, such method comprising administering to a living animal body, including a human, a therapeutically effective amount of the βd-crystalline form of ivabradine hydrochloride of claim 1.

6. A method for treating or preventing clinical situations of myocardial ischaemia and/or a condition involving rhythm disturbances, such method comprising administering to a living animal body, including a human, a therapeutically effective amount of the βd-crystalline form of ivabradine hydrochloride of claim 1.

7. The method of claim 6, wherein the clinical situation of myocardial ischaemia is selected from angina pectoris and myocardial infarct and associated rhythm disturbances.

8. The method of claim 6, wherein the condition involving rhythm disturbances is selected from supra ventricular rhythm disturbances and heart failure.