Process for preparing crystal forms and solvates of dirithromycin
AssigneeEli Lilly and Company
InventorsJames M. Greene, Holly M. Hankins, Gregory A. Stephenson, David D. Wirth
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Abstract
The invention provides Form II dirithromycin, a novel polymorph of dirithromycin. Also disclosed are the acetone, 1-butanol, 1-propanol, and 2-propanol solvates of dirithromycin, which provide an efficient means for preparing and isolating Form II. Processes for preparing and isolating Form II dirithromycin from these solvates or from Form I dirithromycin are provided. A process for obtaining Form II dirithromycin from non-solvated dirithromycin is also provided. Another aspect of the invention is an improved tablet containing Form II dirithromycin as the active ingredient.
Claims16
A process for preparing and isolating Form II dirithromycin which comprises slurrying an acetone, 1-butanol, 1-propanol or 2-propanol solvate of dirithromycin in a solvent comprising from about 70% to about 100% aqueous solvent and from about 0% to about 30% nonaqueous solvent with stirring to produce Form II dirithromycin, said Form II dirithromycin having as a typical x-ray powder diffraction pattern, using a Nicolet 12 V powder diffractometer, wherein d represents the interplanar spacing, the following pattern:
- ______________________________________ d(.ANG.) d(.ANG.) ______________________________________ 14.17 4.72 11.96 4.50 10.43 4.44 9.65 4.24 8.86 4.20 8.18 4.11 7.07 4.09 6.99 3.92 6.84 3.87 6.59 3.83 6.24 3.73 6.07 3.55 5.97 3.46 5.77 3.42 5.54 3.33 5.50 3.17 5.45 3.11 5.13 2.96 5.11 2.83 4.84 2.74 4.75 2.57. ______________________________________
A process for preparing and isolating Form II dirithromycin which comprises slurrying Form I dirithromycin in a solvent comprising from about 80% to about 100% water at a solvent temperature of from about 40.degree. to about 80.degree. C. with stirring until Form II dirithromycin is prepared;
- said Form I dirithromycin having the following x-ray powder diffraction pattern, wherein d represents the interplanar spacing and I/I.sub.o the relative intensity:
- ______________________________________ d(.ANG.) I/I.sub.o ______________________________________ 11.28 1.00 9.81 0.35 8.53 0.76 7.67 0.23 7.12 0.02 6.94 0.02 6.66 0.10 6.39 0.09 5.97 0.21 5.65 0.69 5.42 0.67 5.18 0.23 4.98 0.08 4.83 0.31 4.64 0.07 4.43 0.40 4.26 0.17 4.14 0.05 4.06 0.15 3.86 0.15 3.76 0.17 3.62 0.10 3.50 0.08 3.43 0.03 3.35 0.07 3.04 0.07 2.95 0.02 2.88 0.02 2.84 0.02 2.71 0.03 2.66 0.02 2.58 0.03 ______________________________________
- and said Form II dirithromycin having the following x-ray powder diffraction pattern, wherein d represents the interplanar spacing:
- ______________________________________ d(.ANG.) d(.ANG.) ______________________________________ 14.17 4.72 11.96 4.50 10.43 4.44 9.65 4.24 8.86 4.20 8.18 4.11 7.07 4.09 6.99 3.92 6.84 3.87 6.59 3.83 6.24 3.73 6.07 3.55 5.97 3.46 5.77 3.42 5.54 3.33 5.50 3.17 5.45 3.11 5.13 2.96 5.11 2.83 4.84 2.74 4.75 2.57. ______________________________________
A process for obtaining Form II dirithromycin which comprises dissolving intermediate dirithromycin in a solvent selected from the group consisting of ethyl acetate and toluene, with mixing, at a temperature of from about ambient temperature to about 80.degree. C. until Form II dirithromycin is produced, said intermediate dirithromycin selected from the group consisting of non-solvated dirithromycin;
- amorphous dirithromycin;
- acetone, 1-butanol;
- 1-propanol, and 2-propanol solvates of dirithromycin;
- and Form I dirithromycin having the following x-ray powder diffraction pattern, wherein d represents the interplanar spacing and I/I.sub.o the relative intensity:
- ______________________________________ d(.ANG.) I/I.sub.o ______________________________________ 11.28 1.00 9.81 0.35 8.53 0.76 7.67 0.23 7.12 0.02 6.94 0.02 6.66 0.10 6.39 0.09 5.97 0.21 5.65 0.69 5.42 0.67 5.18 0.23 4.98 0.08 4.83 0.31 4.64 0.07 4.43 0.40 4.26 0.17 4.14 0.05 4.06 0.15 3.86 0.15 3.76 0.17 3.62 0.10 3.50 0.08 3.43 0.03 3.35 0.07 3.04 0.07 2.95 0.02 2.88 0.02 2.84 0.02 2.71 0.03 2.66 0.02 2.58 0.03;
- ______________________________________
- and said Form II dirithromycin having a typical x-ray powder diffraction pattern as follows, using a Nicolet 12 V powder diffractometer, wherein d represents the interplanar spacing:
- ______________________________________ d(.ANG.) d(.ANG.) ______________________________________ 14.17 4.72 11.96 4.50 10.43 4.44 9.65 4.24 8.86 4.20 8.18 4.11 7.07 4.09 6.99 3.92 6.84 3.87 6.59 3.83 6.24 3.73 6.07 3.55 5.97 3.46 5.77 3.42 5.54 3.33 5.50 3.17 5.45 3.11 5.13 2.96 5.11 2.83 4.84 2.74 4.75 2.57. ______________________________________
Dependencies are inferred from the claim text.