Reaction Steps
To a solution of Na2CO3 (0.84 g, 7.92 mmol) in a mixture of H2O (8 mL) and THF (30 mL) was added (1R,2R)-4-[3-[2-(2,4-difluorophenyl)-2-hydroxy-1-methyl-3-(1H-1,2,4-triazol-1-yl)propyl]-4-oxo-3,4-dihydrothieno[3,2-d]pyrimidin-6-yl]benzonitrile (0.5 g, 0.99 mmol, obtained in example 32) and hydroxylamine hydrochloride (0.35 g, 1.95 mmol). The mixture was stirred at reflux overnight, concentrated and the aqueous residue was extracted with CHCl3. The organic phase was separated, dried over Na2SO4, filtered and the filtrate concentrated to a solid which was purified by flash chromatography to give the title compound as a pale yellow solid (325 mg, 61%): mp 246°-247° C.; 1H NMR (300 MHz, MeOH-d4) δ (MeOH) 8.60 (s, 1H, N=CH--N), 8.18 (s, 1H, triazole), 7.86 (d, J=8.5, 2H, arom), 7.78 (d, J=8.5, 2H, arom), 7.71 (s, 1H, triazole), 7.66 (s, 1H, thiophene), 7.43 (dt, Jt =6.5, Jd =9, 1H, arom), 7.06 (ddd, Jd =2.5, Jd =8.5, Jd =14, 1H, arom), 6.89 (dt, Jd =2.5, Jt =8.5, 1H, arom), 6.09 (q, J=7.3, 1H, MeCH), 5.09 (d, J=14.2, 1H, CH(H)), 4.19 (d, J=14.2, 1H, CH(H)), 1.32 (d, J=7.3, 3H, CHMe); MS 314 (N-ethylheterocycle, C15H14N4O2S), 224 (Tr--CH2COHAr, C10H8F2N3O); [α]D =+74.9° (c 1, MeOH). Analysis calculated for C25H21F2N7O3S: C 55.86; H 3.94; N 18.24; S 5.96. Found: C 55.10; H 3.84; N 17.72; S 5.69.
