Crystalline forms of macrolide compounds endowed with antiinflammatory activity
The present invention relates to macrolide compounds endowed with antiinflammatory activity and more particularly relates to new stable crystalline forms of a macrolide derivative with antiinflammatory activity, processes for the preparation of such forms, pharmaceutical compositions containing them as active ingredient and the use of said crystalline forms for the treatment of inflammatory diseases.
1. Crystalline Form I of a compound of formula
characterized by an X-ray powder diffraction pattern comprising 2θ angle values of about 4.9; about 8.5; about 9.1; about 9.6; about 10.3; about 11.1; about 14.5; about 17.0; about 18.2; about 19.3.
2. A crystalline form according to claim 1 which provide an X-ray powder diffraction pattern substantially in accordance with that shown in FIG. 1 .
3. A crystalline form according to claim 1 characterized by a differential scanning calorimetry curve to have an onset of melting which is comprised in the range 163-174° C.
4. A crystalline form according to claim 3 characterized by a differential scanning calorimetry curve to have an onset of melting which is comprised in the range 163-168° C.
5. Crystalline Form II of the compound of formula I
characterized by an X-ray powder diffraction pattern comprising 2θ angle values of about 11.9; about 13.4; about 13.9; about 14.6; about 15.3; about 16.4; about 17.4; about 18.8; about 19.0; about 19.5; about 21.1; about 22.7.
6. A crystalline form according to claim 5 which provide an X-ray powder diffraction pattern substantially in accordance with that shown in FIG. 2 .
7. A crystalline form according to claim 5 characterized by a differential scanning calorimetry curve to have an onset of melting which is comprised in the range 218-226° C.
8. A crystalline form according to claim 7 characterized by a differential scanning calorimetry curve to have an onset of melting which is comprised in the range 218-223° C.
9. A process for the preparation of crystalline Form I of a compound of formula I
which comprises: addition of methyl-tert-butyl ether to a solution of the compound of formula I in ethyl acetate, cooling the reaction mixture obtained, filtering and drying the crystallized product.
10. A process for the preparation of crystalline Form II of a compound of formula I
which comprises the conversion from crystalline Form I of the compound of formula I to crystalline Form II by heating a water suspension of said crystalline Form I of the compound of formula I.
11. A process according to claim 10 wherein the suspension is heated up to a temperature comprised between 30 and 35° C.
12. A process for the preparation of crystalline Form II of a compound of formula
which comprises the crystallization of the compound of formula I from methyl ethyl ketone.
13. A process according to claim 12 further comprising seeding the solution with crystalline Form II.
14. A solid pharmaceutical composition comprising a therapeutically effective amount of crystalline Form I as claimed in claim 1 as active ingredient in admixture with a pharmaceutically acceptable carrier.
15. A solid pharmaceutical composition comprising a therapeutically effective amount of crystalline Form II as claimed in claim 5 as active ingredient in admixture with a pharmaceutically acceptable carrier.
16. A lyophilized pharmaceutical composition comprising a therapeutically effective amount of crystalline Form I as claimed in claim 1 as active ingredient in admixture with a pharmaceutically acceptable carrier.
17. A lyophilized pharmaceutical composition comprising a therapeutically effective amount of crystalline Form II as claimed in claim 5 as active ingredient in admixture with a pharmaceutically acceptable carrier.