Tri-O-acetyl-5-deoxy-D-ribofuranose → 2-Chloro-5-methoxy-1-(2,3-di-O-acetyl-5-deoxy-beta-D-ribofuranosyl)-1H-benzimidazole
Reaction equation
[Cl:1][C:2]1[NH:6][C:5]2[CH:7]=[CH:8][C:9]([O:11][CH3:12])=[CH:10][C:4]=2[N:3]=1.C(O[CH:17]1[O:29][C@H:28]([CH3:30])[C@@H:23]([O:24][C:25](=[O:27])[CH3:26])[C@H:18]1[O:19][C:20](=[O:22])[CH3:21])(=O)C>>[Cl:1][C:2]1[N:6]([C@@H:17]2[O:29][C@H:28]([CH3:30])[C@@H:23]([O:24][C:25](=[O:27])[CH3:26])[C@H:18]2[O:19][C:20](=[O:22])[CH3:21])[C:5]2[CH:7]=[CH:8][C:9]([O:11][CH3:12])=[CH:10][C:4]=2[N:3]=1Participants
3
Procedure
2-Chloro-5-methoxy-1H-benzimidazole (0.661 g, 3.6 mmol) was coupled to 1,2,3-tri-O-acetyl-5deoxy-D-ribofuranose according to General Procedure II. The crude product was purified by flash chromatography (9:1 methylene chloride/ether) to yield the title compound (0.900 g, 65%) as a ˜1:1 mix of regioisomers (1H NMR); MS (AP): m/z 405 (M+Na); 1H NMR (DMSO-d6) δ: 7.65-7.54 (two d, 1H), 7.21 (s, 1H), 6.97 (m, 1H), 6.18-6.11 (two d, 1H), 5.70-5.59 (m, 1H), 5.21 (q, 1H), 4.27 (m, 1H), 3.83 (two s, 3H), 2.16 (s, 3H), 2.05 (s, 3H), 1.51 (t, 3H).