Ethanolamine → 2-((3-(5-Phenyl-4-(trifluoromethyl)isoxazol-3-yl)-4,5-dihydronaphtho[1,2-c]isoxazol-7-yl)methylamino)ethanol

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Reaction Steps

A mixture of 3-(5-phenyl-4-(trifluoromethyl)isoxazol-3-yl)-4,5-dihydronaphtho[1,2-c]isoxazole-7-carbaldehyde (Preparation 88A, 40 mg, 0.097 mmol), Ethanolamine (0.059 mL, 0.975 mmol), 1,2-dichloroethane (3 mL) and sodium triacetoxyborohydride (62.0 mg, 0.292 mmol) was stirred at room temperature overnight. Sodium cyanoborohydride (20 mg, 0.318 mmol) was then added. The mixture was stirred at room temperature for 1 h before water (1 mL) was added. The aqueous layer was extracted with ethyl acetate (3×1 mL). The combined organic solutions were concentrated under reduced pressure. Purification using reverse phase HPLC (Phenomenex Luna AXIA 5 u c18 30×100 mm, 10 min. run, solvent A: 10% MeOH: 90% H2O: 0.1% TFA, solvent B: 90% MeOH, 10% H2O, 0.1% TFA), concentration, neutralization with saturated aqueous sodium bicarbonate solution, and extraction with ethyl acetate gave 2-((3-(5-phenyl-4-(trifluoromethyl)isoxazol-3-yl)-4,5-dihydronaphtho[1,2-c]isoxazol-7-yl)methylamino)ethanol (28 mg, 0.060 mmol, 61.8% yield) as a white solid.

Provenance & Evidence