METHODS OF MAKING NETUPITANT AND INTERMEDIATES THEREOF
Methods are disclosed for the preparation of netupitant and pharmaceutically acceptable salts thereof which are novel, easily reproducible, environmentally safe and cost effective. The methods may employ inexpensive starting materials and the preparation processes for intermediates are simple and highly reproducible. Novel intermediates for the preparation of netupitant and pharmaceutically acceptable salts thereof are also disclosed. Amorphous netupitant and methods of making same are disclosed.
1 . Amorphous netupitant.
2 . Amorphous netupitant according to claim 1 having an x-ray diffraction pattern of FIG. 1 .
3 . Amorphous netupitant according to claim 1 having an x-ray diffraction pattern of FIG. 2 .
4 . A process for making amorphous netupitant comprising combining netupitant and povidone, dissolving the combined netupitant and povidone in a solvent to obtain a solution, removing the solvent from the solution by distillation, and recovering the resultant solid.
5 . The process according to claim 4 wherein the solvent is methanol.
6 . The process according to claim 4 wherein the distillation step is conducted under vacuum at a temperature below 50° C.
7 . The process according to claim 4 further comprising drying the resultant solid at 50° to 60° C. under vacuum.
8 . The process according to claim 4 wherein the amorphous netupitant has an x-ray diffraction pattern of FIG. 1 .
9 . A process for making amorphous netupitant comprising dissolving netupitant in acetone to obtain a first netupitant solution, removing the acetone from the first netupitant solution by distillation and recovering the netupitant, dissolving the recovered netupitant in dichloromethane to obtain a second netupitant solution, separately, dissolving povidone in dichloromethane to obtain a povidone solution, combining the povidone solution with the second netupitant solution to obtain a combined povidone-netupitant solution, removing the dichloromethane from the combined povidone-netupitant solution by distillation, and recovering the resultant solid.
10 . The process according to claim 9 wherein the step of removing the acetone by distillation is conducted under vacuum at below 50° C.
11 . The process according to claim 9 further comprising refluxing the second netupitant solution.
12 . The process according to claim 9 further comprising refluxing the povidone solution to obtain a clear solution prior to combining the povidone solution with the second netupitant solution.
13 . The process according to claim 9 wherein the amorphous netupitant has an x-ray diffraction pattern of FIG. 2 .