The present invention relates to a process for making a compound of formula (I) as described hereincomprising reducing a compound of formula (II) as described herein with hydrogen in the presence of a palladium catalyst and a solvent wherein the solvent is a polar, aprotic solvent or a C3-C10 alcohol.The present invention further relates to a hydrochloride salt and a monohydrochloride salt of the compound of formula (I) as described herein and to a process for making the same.本發明關於在本文中所述之具有化學式（I）之化合物之製備方法包括在鈀催化劑及溶劑存在之情況下，利用氫氣以還原在本文中所述之具有化學式（II）之化合物，其中溶劑為極性的非質子溶劑或C3-C10醇。本發明更關於在本文中所述之具有化學式（I）之化合物之鹽酸鹽及單鹽酸鹽及其製備方法。
