Pregabalin Impurity 31 L-Tartrate synthesis

Yield:-

Reaction Conditions:

in water at 15 - 45; for 1.5 h;

Steps:

6

Example 6: Preparation of 3-(amino methyl) N,N-diethyl-5-methyl hexanamide L(+) tartarate salt.; 3-methyl amino N,N-diethyl-5 -methyl hexanamide (10 gm) was suspended in water and added L(+) tartaric acid (7.0 gm). The reaction mixture was slowly heated to 40-45°C and stirred for 30 min and filtered to remove the un-dissolved material. The filtrate was cooled to 20°C and stirred at 15-20° C for 1 hour. Filtered the solid obtained washed with water and dried the material at 40-45 °C to obtain the title compoundYield: 5.9 grams.Specific optical Rotation: [α]_D²⁵ = + 9.2° (c=l, water)

References:

WO2009/1372,2008,A2 Location in patent:Page/Page column 27