反应详情

A solution of 3-benzyloxymethyl-3′-benzyloxymethylthymidine (14.5 g, 30 mmol) in DMSO (200 ml) was treated with DCC (33 g, 160 mmol) and phosphoric acid 85% (2.0 g) for 16 h. The reaction mixture was filtered and concentrated in vacuo. The resultant oil was chromatographed on silica gel (EtOAc/hexane, 7/3) to afford the product as a viscous oil, 11 g (76%). 1H NMR (CDCl3) 1.92 (s, 3H, C5-CH3), 2.20-2.52 (m, 2H, C2′H), 4.09 (m, 1H, C4′H), 4.49 (m, 1H, C3′H), 4.62 (s, 2H, NCH2O), 6.28 (t, 1H, C1′H) 7.24-7.51 (M, 11H, ArH, CH═), 9.65 (s, 1H, CHO). Anal. Calcd. for C26H28N2O7: C, 64.99; H, 5.87; N, 5.83. Found: C, 64.68; H, 5.95; N, 6.01.

1. filtrationThe reaction mixture was filtered
2. concentrationconcentrated in vacuo
3. customThe resultant oil was chromatographed on silica gel (EtOAc/hexane, 7/3)