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A solution of 3-[Methyl-(1-methyl-piperidin-4-yl)-carbamoyl]-2,3-dihydro-indole-1-carboxylic acid tert-butyl ester (C) (3.93 g, 10.53 mmol) in dichloromethane (20 cm3) was cooled to 0° C. in an ice/water bath and trifluoroacetic acid (10 cm3) added. The solution was stirred at 0° C. for 1 hr before warming to room temperature. The solution was made basic with saturated aqueous sodium bicarbonate solution and extracted with dichloromethane (3×100 cm3). The organic layer was then dried over magnesium sulfate, filtered and evaporated under reduced pressure to afford the title compound (D) (2.79 g, 10.2 mmol, 97%).

1. temperaturebefore warming to room temperature
2. extractionextracted with dichloromethane (3×100 cm3)
3. dry with materialThe organic layer was then dried over magnesium sulfate
4. filtrationfiltered
5. customevaporated under reduced pressure