Ethanol → HCID 54190709, compound

Participants

Reaction Steps

A mixture of 0.430 g (0.664 mmol) of the blocked nucleoside (102) and 0.216 g (3.317 mmol) of KCN in 13 of mL of 70% EtOH was stirred at room temperature for 6 hr. The reaction mixture was diluted with 75 mL of EtOAc. The EtOAc solution was washed with H2O (50 mL), sat. NaCl solution (50 mL), dried (Na2SO4), and evaporated. The residue was chromatographed on a silica column (1.9×15 cm, eluted successively with CHCl3, 1%, 2%, 3% MeOH/CHCl3). Evaporation of fractions 43-60 (10 mL per fraction) and recrystallization from MeOH/MeCN gave 0.157 g (2 crops, 44%) of 103 as white crystals. MP: 168°-170° C. MS: (FAB) m/e 518.7947 (28%, MH+ =518.7957). 1H NMR (DMSO-d6): d 8.76 (s, 1, 7-H), 5.87 (d, 1, 1'-H, J1'-2' =8.0 Hz), 5.51 d, 1, 2'-OH, J2'-2'OH =6.0 Hz), 5.42 (t, 1, 5'-OH, J5'-5'OH =4.5 Hz), 5.30 (d, 1, 3'-OH, J3'-3'OH =4.5 Hz), 4.37 (m, 1, 2'-H, J2'-3' =5.5 Hz), 4.14 (m, 1, 3'-H, J3'-4' =2.0 Hz), 4.02 (m, 1, 4'-H, J4'-5' =J4'-5" =2.5 Hz), 3.71 (m, 2, 5'-H and 5"-H, J5'-5" =12.0 Ha). 13C NMR (DMSO-d6): d 142.32 (C2), 140.92 (C3a), 132.50 (C7a), 120.62 (C5), 118.44 (C6), 117.10 (C7), 115.34 (C4), 89.58 (C1'), 86.50 (C4'), 71.93 (C2'), 69.63 (C3'), 60.89 (C5'). Anal. Calcd. for C12H10Br3ClN2O4 0.3 MeCN: C, 28.36; H, 2.06; N, 6.04. Found: C, 28.25; H, 1.84; N, 5.90. (the Content of 0.3 MeCN was also indicated by 1H NMR.)

Provenance & Evidence