Triethylamine → 1-(4-{(S)-3-[6-(6-Methoxy-5-trifluoromethyl-pyridin-3-yl)-5,6,7,8-tetrahydro-pyrido[4,3-d]pyrimidin-4-yloxy]-pyrrolidine-1-carbonyl}-piperazin-1-yl)-ethanone

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Reaction Steps

To a solution of 6-(6-methoxy-5-trifluoromethyl-pyridin-3-yl)-4-((S)-pyrrolidin-3-yloxy)-5,6,7,8-tetrahydro-pyrido[4,3-d]pyrimidine (prepared using step 1, example 91 from intermediate 13) (25 mg, 0.063 mmol) and triethylamine (0.013 mL, 0.095 mmol) in CH2Cl2 (2 mL) was added 3-(4-acetyl-piperazine-1-carbonyl)-1-methyl-3H-imidazol-3-ium iodide (Intermediate 6) (15 mg, 0.063 mmol) and the mixture stirred at room temperature under argon for 18 h. Partitioned between CH2Cl2 (10 mL) and sat. NaHCO3(aq) (2 mL) and the organic layer was filtered through a phase separation tube and evaporated in vacuo. Purification by reverse phase Gilson HPLC (Method A) and subsequent neutralization of the combined fractions by elution through an Isolute SCX-2 cartridge, eluting with methanol, then with 2M ammonia in methanol. Basic fractions were concentrated in vacuo to give 1-(4-{(S)-3-[6-(6-Methoxy-5-trifluoromethyl-pyridin-3-yl)-5,6,7,8-tetrahydro-pyrido[4,3-d]pyrimidin-4-yloxy]-pyrrolidine-1-carbonyl}-piperazin-1-yl)-ethanone as a pale yellow powder (9 mg, 25% yield). 1H NMR (400 MHz, MeOH-d4, 298K) δ ppm 2.14 (s, 3H) 2.24-2.33 (m, 2H) 3.04 (t, 2H) 3.25-3.91 (m, 13H) 3.99 (s, 3H) 4.18 (s, 2H) 5.74-5.78 (m, 1H) 7.79 (d, 1H) 8.14 (d, 1H) 8.60 (s, 1H) LCMS: [M+H]+=550.2, Rt(1)=1.58 min.

Provenance & Evidence