[Cl:1][C:2]1[N:10]=[C:9]2[C:5]([N:6]=[C:7]([C:12]3(O)[CH2:15][O:14][CH2:13]3)[N:8]2[CH3:11])=[C:4]([N:17]2[CH2:22][CH2:21][O:20][CH2:19][C@@H:18]2[CH3:23])[N:3]=1.C(N(S(F)(F)[F:30])CC)C>C(Cl)Cl>[Cl:1][C:2]1[N:10]=[C:9]2[C:5]([N:6]=[C:7]([C:12]3([F:30])[CH2:15][O:14][CH2:13]3)[N:8]2[CH3:11])=[C:4]([N:17]2[CH2:22][CH2:21][O:20][CH2:19][C@@H:18]2[CH3:23])[N:3]=1To a stirred solution of (S)-3-(2-chloro-9-methyl-6-(3-methylmorpholino)-9H-purin-8-yl)oxetan-3-ol (127.6 mg, 0.364 mmol) in anhydrous DCM (8.0 mL) at −78° C. under N2 was added diethylaminosulfur trifluoride (59.5 μL, 0.436 mmol, 1.2 eq.). The reaction mixture was warmed to 0° C. over 3 h, stirred at RT for 2 h, and quenched with 1N sodium hydroxide solution. The reaction mixture was diluted with ethyl acetate. The two phases were separated, and the organic layer was washed with water and brine, then dried (Na2SO4), filtered and evaporated in vacuo. The resultant residue was purified by column chromotagraphy (Si-PPC, gradient 0 to 100% ethyl acetate in hexane) to give the product as a foam (79.6 mg, 62.0%). 1H NMR (CDCl3, 500 MHz) δ ppm 6.10 to 4.40 (broad s, 2H), 5.30 to 5.19 (m, 2H), 5.10 (dd, J=20.7, 7.8 Hz, 2H), 4.04 to 3.98 (m, 1H), 3.83 to 3.73 (m, 2H), 3.68 (d, J=1.5 Hz, 3H), 3.61 (td, J=11.6, 2.8 Hz, 1H), 3.48 (broad s, 1H), 1.40 (d, J=6.8 Hz, 3H); LC-MS m/z (method A)=342 [M+H]+, RT=2.36 min.
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