Ethanol → HCID 86718595, compound

Participants

Reaction Steps

Sodium triacetoxy borohydride (590 mg, 2.79 mmol) was added to a solution of N,N-diethylethylenediamine (0.37 mL, 2.63 mmol) and 5-(tert-butyl)-2-hydroxy-3-(6-(trifluoromethyl)pyridin-3-yl)benzaldehyde (Example 47, Step 1) (0.50 g, 1.55 mmol) in tetrahydrofuran (15 mL) and the reaction mixture stirred at room temperature under nitrogen for 16 hours. Progress of the reaction was monitored by LC/MS and showed both product and starting material. A reaction aliquot was treated with sodium borohydride and the LC/MS showed only product. Therefore, the reaction solvent was removed under reduced pressure and the residue re-dissolved in methanol (15 mL) and sodium borohydride (286 mg, 7.74 mmol) added. The reaction mixture was stirred at room temperature for 10 minutes and then saturated aqueous ammonium chloride solution (1.0 mL) added. The reaction mixture was partitioned between saturated aqueous ammonium chloride solution and ethyl acetate. The organic phase was separated, dried (Na2SO4), filtered and the solvent was removed under reduced pressure. The residue was purified using flash chromatography on silica eluting with a solvent gradient of 0 to 100% (1% ammonium hydroxide, 10% methanol, 89% methylene chloride) in methylene chloride. The product was dissolved in a 1.25 M solution of hydrochloric acid in ethanol (5 mL, 6.3 mmol), the mixture stirred for 30 minutes then concentrated under reduced pressure. The product was triturated with diethyl ether to give 4-(tert-butyl)-2-(((2-(diethylamino)ethyl)amino)methyl)-6-(6-(trifluoromethyl)pyridin-3-yl)phenol dihydrochloride (190 mg, 25% yield) as a white powder.

Provenance & Evidence