[NH2:1][C:2]1[C:3]([NH:11][C@@H:12]2[CH2:17][O:16][C@@H:15]([CH2:18][OH:19])[CH2:14][CH2:13]2)=[C:4]2[S:10][CH:9]=[CH:8][C:5]2=[N:6][CH:7]=1.[C:20](OCC)(OCC)(OCC)[CH3:21]>C(O)(=O)C.CO>[CH3:20][C:21]1[N:11]([C@@H:12]2[CH2:17][O:16][C@@H:15]([CH2:18][OH:19])[CH2:14][CH2:13]2)[C:3]2=[C:4]3[S:10][CH:9]=[CH:8][C:5]3=[N:6][CH:7]=[C:2]2[N:1]=1To a solution of {(2R,5S)-5-[(6-aminothieno[3,2-b]pyridin-7-yl)amino]tetrahydro-2H-pyran-2-yl}methanol (131 mg, 0.469 mmol) in acetic acid (1.3 mL) was added triethyl orthoacetate (275 μL, 1.50 mmol). The mixture was stirred at 120° C. for 30 min. After cooling to room temperature, the mixture was diluted with methanol and purified with prep-LCMS (XBridge C18 column, eluting with a gradient of acetonitrile/water containing 0.1% ammonium hydroxide, at flow rate of 60 mL/min) to give the desired product as white solid (60 mg, 42%). LCMS calculated for C15H18N3O2S (M+H)+: m/z=304.1. Found: 304.1.
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