Trifluoroacetic acid → 4-[4-(7H-Pyrrolo[2,3-d]pyrimidin-4-yl)-1H-pyrazol-1-yl]cyclohexylideneacetonitrile

Participants

Reaction Steps

A solution of TFA (0.5 mL, 0.006 mol) and 4-[4-(7-[2-(trimethylsilyl)ethoxy]methyl-7H-pyrrolo[2,3-d]pyrimidin-4-yl)-1H-pyrazol-1-yl]cyclohexylideneacetonitrile (22.7 mg, 0.0000522 mol), was stirred for 1.5 h. The solution was then concentrated using a rotary evaporator to remove TFA. LCMS analysis showed conversion to the hydroxymethyl intermediate, M+H 335. Methanol was added; and the methanol mixture was concentrated again using a rotary evaporator. The resulting residue was dissolved in methanol (1 mL) and ammonium hydroxide (0.25 mL, 0.0064 mol) was added. The resulting solution was stirred for 16 h. LCMS analysis showed complete de-protection. The solution was then concentrated using a rotary evaporator. The product was isolated by prep HPLC using a 30 mm×100 mm C18 column; 18% CH3CN—H2O (0.1% TFA), 1 min, to 35% at 6 min; 60 mL/min; detector set at 254 nm; retention time, 4.4 min. The eluate was freeze dried. yield 7.6 mg of a white solid (TFA salt; racemic; 34.6%). 1H NMR (d6-DMSO) δ 12.9 (br s, 1H, NH); 8.9 (s, 2H); 8.5 (s, 1H); 7.8 (m, 1H); 7.3 (m, 1H); 5.6 (s, 1H, olefin); 4.6 (m, 1H, NCH); 2.8 (m, 1H); 2.6 (m, 1H); 2.5 (m, 2H); 2.3 (m, 2H) 2.0 (m, 2H). MS(ES) 305 (M+1).

Provenance & Evidence