Dimethylamine, hydrochloride → N,N-dimethyl-3-[[(3-phenoxyphenyl)(3,3,3-trifluoro-2-hydroxypropyl)amino]methyl]-benzamide

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Reaction Steps

To a solution of N,N-dimethylamine hydrochloride (525 mg, 0.0064 mol) in 3.0 mL of toluene at −40° C. was added dropwise a 2.0 M solution of trimethylaluminum in toluene (3.2 mL, 0.0064 mol) over 15 min. The reaction mixture was warmed to room temperature and stirred for 2 h. To a solution of methyl 3-[[(3-phenoxyphenyl)(3,3,3-trifluoro-2-hydroxypropyl)amino]methyl]benzoate (209 mg, 0.00047 mol) from EX-612B in 2.5 mL of toluene at −10° C. was slowly added the (N,N-dimethylamino)-chloromethylaluminum reagent (850 μL, 0.00085 mol). The reaction mixture was warmed to room temperature then heated at 40° C. overnight. The reaction mixture was cooled to room temperature, then diluted with ethyl acetate and quenched with 10% aqueous potassium hydrogen phosphate. The organic layer was dried over MgSO4 and concentrated in vacuo. The crude product was purified by column chromatography on silica gel eluting with 2:3 ethyl acetate in hexane to afford 195 mg (91%) of the desired N,N-dimethyl-3-[[(3-phenoxyphenyl)(3,3,3-trifluoro-2-hydroxypropyl)amino]methyl]-benzamide product as a pale yellow solid. Anal. calcd. for C25H25F3N2O3.0.5H2O: C, 64.23; H, 5.61; N, 5.99. Found: C, 64.49; H, 5.77; N, 5.85. HRMS calcd. 459.1896 [M+H]+, found: 458.1887. 1H NMR (C6D6) δ7.01-6.95 (m, 3H), 6.92-6.87 (m, 5H), 6.79 (t, 1H), 6.46 (s, 1H), 6.37 (t, 2H), 4.91 (bs, 1H), 4.26 (s, 2H), 4.10 (bq, 1H), 3.84 (dd, 1H), 3.38 (dd, 1H), 2.53 (bs, 3H), 2.14 (bs, 3H). 19F NMR (C6D6) δ−78.69 (d, 3F).

Provenance & Evidence