Formaldehyde → N-[(1RS,2SR)-2-(Cyclobutyl-methyl-amino)-cyclohexyl]-2-methoxy-4,6-bis-trifluoromethyl-benzamide

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cis-N-(2-Cyclobutylamino-cyclohexyl)-2-methoxy-4,6-bis-trifluoromethyl-benzamide (example 16, 118 mg, 0.27 mmol) was dissolved in 2 mL formic acid. Formaldehyde (36% in water, 0.06 mL, 0.81 mmol) was added and the reaction mixture was stirred at 110° C. over night. The reaction mixture was basified by slow addition of 10 ml 1N sodium carbonate solution. The mixture was extracted three times with ethyl acetate. The combined organic phases were dried on sodium sulfate, filtered and evaporated. Purification of the residue by flash chromatography on silica gel (dichloromethane/methanol/ammonia 100:0:0->110:10:1) yielded the title compound as a white solid (46 mg, 38%), MS: m/e=453.2 [(M+H)+].

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