Reaction Steps
7-Chloro-2-furan-2-yl-[1,2,4]triazolo[1,5-c]pyrimidin-5-ylamine (1 eq, see U.S. Pat. No. 6,222,035 B1), cis-(octahydro-pyrido[1,2-a]pyrazin-7-yl)-methanol (1-2 eq.), and CsF (1-2 eq.) were dissolved in DMSO. The mixture was stirred at around 120° C. for 18 hours. The solution was then cooled to room temperature, filtered and purified by preparative HPLC using aqueous CH3CN (buffered with 0.1% TFA) to give the desired, compound as a white solid. Alternatively, for scale up synthesis, the DMSO solvent was removed and the crude product was chromatographed on silica gel column using 5-10% MeOH/CH2Cl2 as eluant to afford the desired product: 1H NMR (400 Hz, CD3OD) δ 7.71 (d, J=2.0 Hz, 1H), 7.14 (d, J=3.5 Hz, 1H), 6.63 (dd, J=3.5, 2.0 Hz, 1H), 5.99 (s, 1H), 4.26 (d, J=13.5 Hz, 1H), 4.19 (d, J=13.5 Hz, 1H), 3.83 (dd, J=10.5, 7.5 Hz, 1H), 3.74 (dd, J=10.5, 7.5 Hz, 1H), 3.04 (dt, J=12.5, 3.0 Hz, 1H), 2.95 (d, J=12.0 Hz, 1H), 2.80 (d, J=11.0 Hz, 1H), 2.62 (dd, J=12.5, 10.5 Hz, 1H), 2.22 (m, 2H), 1.98 (m, 1H), 1.86 (brd, 12.0 Hz, 2H), 1.62 (m, 1H), 1.50-1.42 (m, 2H). MS m/z: 370 [M+H]+.
