To a stirred, ice-cooled suspension of 2,2,2-trifluoro-N-((1R,2S)-1-(1-(4-(hydroxymethyl)phenyl)-1H-indazol-5-yloxy)-1-phenylpropan-2-yl)acetamide (141, 118 mg, 0.25 mmol) and triethylamine (0.35 mL, 2.5 mmol) was added methanesulfonyl chloride (140 μL, 1.8 mmol). After stirring for 50 min at 0° C. brine and dichloromethane (10 mL) were added. The mixture was washed with aqueous KHSO4 (1M) and sat. aqueous NaHCO3. To the organic phase was added dimethylamine (0.75 mL, 11.3 mmol). The mixture was stirred at ambient temperature for 40 min and was then evaporated. Preparative HPLC (Kromasil C-18, 2.5×20 cm, 30-90% CH3CN in water/40 min (0.1% TfA) afforded slightly impure title compound as a TfA-salt. The material was dissolved in MeOH and absorbed on a plug of acidic ion exchange resin (SCX, 5 g, pre-washed with MeOH). Eluting subsequently with MeOH and methanolic ammonia (2M) gave somewhat impure title compound. Purification by preparative HPLC on an XBridge C-18 column using a gradient of 50-90% acetonitrile in water containing 0.1% aqueous ammonia (28%). afforded pure N-((1R,2S)-1-(1-(4-((dimethylamino)methyl)phenyl)-1H-indazol-5-yloxy)-1-phenylpropan-2-yl)-2,2,2-trifluoroacetamide (77 mg, 61%).
