Triethylamine → {(S)-3-[6-(6-methoxy-5-trifluoromethyl-pyridin-3-yl)-5,6,7,8-tetrahydro-pyrido[4,3-d]pyrimidin-4-yloxy]-pyrrolidin-1-yl}-(4-methyl-piperazin-1-yl)-methanone

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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) (23.0 mg, 0.058 mmol) and triethylamine (0.016 mL, 0.116 mmol) in CH2Cl2 (2 mL) was added 4-methylpiperazine-1-carbonyl chloride hydrochloride (11.6 mg, 0.058 mmol) and the mixture stirred at rt for 18 h. Diluted with CH2Cl2 (10 mL) and washed with sat. NaHCO3(aq) (2 mL). The organic layer was filtered through a phase separation tube and evaporated in vacuo. Purification was performed 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 {(S)-3-[6-(6-methoxy-5-trifluoromethyl-pyridin-3-yl)-5,6,7,8-tetrahydro-pyrido[4,3-d]pyrimidin-4-yloxy]-pyrrolidin-1-yl}-(4-methyl-piperazin-1-yl)-methanone (25 mg, 58% yield) as a yellow powder. 1H NMR (400 MHz, CDCl3, 298K) δ ppm 2.17-2.27 (m, 2H) 2.55 (s, 3H) 2.65-2.78 (m, 4H) 3.07 (t, 2H) 3.45-3.73 (m, 9H) 3.86-3.95 (m, 1H) 4.02 (s, 3H) 4.13 (s, 2H) 5.66-5.73 (m, 1H) 7.62 (d, 1H) 8.06 (d, 1H) 8.64 (s, 1H) LCMS: [M+H]+=522.3, Rt(1)=1.21 min.

Provenance & Evidence