4-Hydroxybenzaldehyde → 4-((4-((6-(2,2,2-Trifluoroethyl)thieno[2,3-d]pyrimidin-4-yl)amino)piperidin-1-yl)methyl)phenol

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Reaction Steps

59 mg of N-(piperidin-4-yl)-6-(2,2,2-trifluoroethyl)thieno[2,3-d]pyrimidin-4-amine (0.19 mmol) and 21 mg of p-hydroxybenzaldehyde (0.19 mmol) were dissolved in 0.5 mL of MeOH in the presence of 10 uL of acetic acid. 19 mg of NaBH3CN (0.3 mmol) was slowly added to that mixture and solution was stirred for 24 hs. All volatiles were removed under reduced pressure and residue was partitioned between water and ethyl acetate. Organic layer was washed with brine, dried over magnesium sulfate and evaporated. The residue was purified on silica gel column with DCM:MeOH:Et3N as eluent resulting in 62 mg of 4-((4-((6-(2,2,2-trifluoroethyl)thieno[2,3-d]pyrimidin-4-yl)amino)piperidin-1-yl)methyl)phenol (compound 105). 1H NMR (600 MHz, CDCl3): δ 8.46 (s, 1H), 7.09 (d, 2H, J=8.4 Hz), 7.07 (s, 1H), 6.68 (d, 2H, J=8.4 Hz), 5.28 (d, 1H, J=7.7 Hz), 4.21 (m, 1H), 3.59 (q, 2H, 9.9 Hz), 3.46 (s, 2H), 2.96 (m, 2H), 2.21 (m, 2H), 2.09 (m, 2H), 1.62 (m, 2H). 13C NMR (150 MHz, CDCl3): δC 166.45, 156.08, 155.98, 154.14, 131.01, 128.23, 125.57, 118.65, 116.52, 115.62, 62.48, 52.10, 47.96, 35.50 (q, J=31.5 Hz), 31.89. ESI MS [MH+]: 423.1458. Its monohydrochloride salt was obtained by adding 1 equivalent of 1N HCl solution in diethyl ether to a solution of compound in ethanol.

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