Tin tetrachloride → 5-((4-((6-(2,2,2-trifluoroethyl)thieno[2,3-d]pyrimidin-4-yl)amino)piperidin-1-yl)methyl)-1H-indole-2-carbonitrile

Participants

Reaction Steps

16.7 mg of tert-butyl 2-cyano-5-bromomethyl-1H-indole-1-carboxylate (0.05 mmol) and 15.8 mg of N-(piperidin-4-yl)-6-(2,2,2-trifluoroethyl)thieno[2,3-d]pyrimidin-4-amine (0.05 mmol) were dissolved in 0.6 mL of DCM. 12.9 mg of DIPEA (0.1 mmol) was added to that solution and reaction mixture was stirred for 18 hs. Then reaction mixture was directly loaded on silica gel column and the product was eluted with DCM-MeOH 30:1. After evaporation of solvent boc-protected intermediate was dissolved in 0.5 mL of ACN and 0.06 mL of SnCl4 (0.5 mmol) was added. The homogenous reaction mixture was stirred for 1 h and then all volatiles were removed in vacuo. The residue was quenched ammonia and extracted with ethyl acetate. Combined organic fractions were dried over MgSO4 and concentrated. The residue was purified on silica gel column using hexane-ethyl acetate-MeOH 1:1:0.1 to produce 16 mg of 5((4-((6-(2,2,2-trifluoroethyl)thieno[2,3-d]pyrimidin-4-yl)amino)piperidin-1-yl)methyl)-1H-indole-2-carbonitrile (Compound 175). Its monohydrochloride salt was obtained by adding 1 equivalent of 1N HCl solution in diethyl ether to a solution of compound in ethanol. The hydrochloride salt was recrystallized from methanol. 1H NMR (600 MHz, DMSO-d6): δ 12.62 (s, 1H), 10.74 (br, 1H), 8.33 (s, 1H), 8.07 (d, 1H, J=7 Hz), 7.93, s, 1H), 7.70 (s, 1H), 7.62 (d, 1H, J=12 Hz), 7.56 (d, 1H, J=12 Hz), 7.45 (s, 1H), 4.36 (s, 1H), 4.30 (m, 1H), 4.03 (q, 2H, J=11 Hz), 3.41 (m, 2H), 3.11 (m, 2H), 2.12 (m, 2H), 1.98 (m, 2H).

Provenance & Evidence