Tri-o-tolylphosphine → N-(3-(3-(3-ethyl-3-hydroxypentyl)phenyl)propyl)-2,2,2-trifluoroacetamide

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To a degassed solution of N-(3-(3-bromophenyl)propyl)-2,2,2-trifluoroacetamide (10) (2.29 g, 7.4 mmol) and 4-ethynylheptan-4-ol (2.4 g, 18.5 mmol) in triethylamine (2 mL) and DMF (18 mL) was added PdCl2(PPh3)2 (0.130 g, 0.185 mmol), P(o-Tol)3 (0.113 g, 0.37 mmol), and CuI (0.070 g, 0.37 mmol). The resulting mixture was degassed and stirred under argon at 90° C. overnight. The mixture was cooled to room temperature and the solids were removed by filtration through Celite. The filtrate was partitioned between diethyl ether and water and the combined organics were washed with brine, dried over Na2SO4 and concentrated under reduced pressure. Purification by flash chromatography (6 to 50% EtOAc-hexanes gradient) gave N-(3-(3-(3-ethyl-3-hydroxypentyl)phenyl)propyl)-2,2,2-trifluoroacetamide (12) as an amber oil. Yield (2.6 g, 95%): 1H NMR (400 MHz, DMSO-d6) δ 9.40 (s, 1H), 7.18-7.29 (m, 4H), 3.16 (q, J=7.2 Hz, 2H), 2.56 (t, J=7.2 Hz, 2H), 1.76 (quint, J=7.2 Hz, 2H), 1.53-1.67 (m, 8H), 0.97 (t, J=7.2 Hz, 6H).

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