C(OC([N:8]1[CH2:13][CH2:12][C:11]2[N:14]=[C:15]([O:17][CH:18]3[CH2:23][CH2:22][N:21]([CH:24]4[CH2:27][CH2:26][CH2:25]4)[CH2:20][CH2:19]3)[S:16][C:10]=2[CH2:9]1)=O)(C)(C)C.FC(F)(F)C(O)=O>ClCCl>[CH:24]1([N:21]2[CH2:20][CH2:19][CH:18]([O:17][C:15]3[S:16][C:10]4[CH2:9][NH:8][CH2:13][CH2:12][C:11]=4[N:14]=3)[CH2:23][CH2:22]2)[CH2:25][CH2:26][CH2:27]1A solution of 2-(1-Cyclobutyl-piperidin-4-yloxy)-6,7-dihydro-4H-thiazolo[5,4-c]pyridine-5-carboxylic acid tert-butyl ester (2.0 grams, 5 mmol, obtained in above step) in dichloromethane (30 mL) was treated with trifluroacetic acid (5.0 mL, 50 mmol) at 0° C. Reaction mass was stirred for 4 hours. After completion of reaction, the reaction mass was quenched into ice cold water and adjust pH to 10, by using 40% aqueous sodium hydroxide solution. The product was extracted with dichloromethane (3×50 mL), combined organics were washed with water followed by brine and dried over anhydrous sodium sulphate. Organic volatiles were evaporated under vacuum to obtain the title compound (1.3 grams).
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