PROCESS FOR THE PREPARATION OF AN ORLISTAT DERIVATIVE USEFUL AS REFERENCE STANDARD IN THE DETERMINATION OF THE PURITY OF ORLISTAT AND PROCESS FOR THE PREPARATION OF ORLISTAT

摘要

The invention relates to a leucine derivative, N-2[(S)-2-N-formylamino-4-methyl pentanoic acid (S)-1-[[3(S)-hydroxy-5-oxo-4-hexyl methyl]dodecyl ester] amino-4-methyl pentanoic acid (S)-1-[(2S, 3S)-3-hexyl-4-oxo-2-oxetanyl]methyl dodecyl ester of Formula (I), and process for isolating it. More particularly, it relates to the preparation of pure orlistat, which is (S)-2-Formylamino-4-methyl pentanoic acid (S)-1-[(2S, 3S)-3-hexyl-4-oxo-2-oxetanyl]methyl]dodecyl ester. The invention also relates to the use of the Compound of Formula (I) as reference standard or reference marker for checking the purity of orlistat.