Methanol → 6-N-(4-Monomethoxytrityl)-9-(2-deoxy-5-O-(4-monomethoxytrityl)-beta-L-threopentofuranosyl)adenine

Compound 6 (0.62 g, 1.24 mmol) in dry pyridine (25 mL) was treated with 4-monomethoxytrityl chloride (0.46 g, 1.49 mmol) at room temperature for 16 h. After addition of methanol (5 mL), the mixture was concentrated to dryness. The residue was dissolved in dichloromethane (60 mL) and washed successively with water (40 mL), a saturated aqueous solution of NaHCO3 (40 mL) and water (3×40 mL). The organic layer was dried, filtered, concentrated and co-evaporated with toluene and methanol. The residue was purified by silica gel column chromatography (0-10% MeOH in dichloromethane) to give 7 (0.71 g, 72%) as a foam: 1H NMR (DMSO-d6): δ 2.21 (d, 1H, H-2′ J2′,2″=14.3 Hz), 2.6-2.7 (m, 1H, H-2″), 3.1-3.3 (2m, 2H, H-5′ and H-5″), 3.64 and 3.65 (2s, 6H, 2×OCH3), 4.1-4.2 (m, 1H, H-4′), 4.2-4.3 (m, 1H, H-3′), 5.68 (d, 1H, OH-3′, JH,OH=5.2 Hz), 6.24 (d, 1H, H-1′, J1′,2″=7.0 Hz), 6.7-6.8 and 7.1-7.3 (2m, 29H, 2 MMTr and NH-6) 7.83 and 8.21 (2s, 2H, H-2 and H-8); ms: matrix G/T, (FAB+) m/z 796 [M+H]+, 408 [BH2]+, (FAB−) m/z 794 [M−H]−, 406 [B]−; UV (95% ethanol): λmax 275 nm (ε 30900), λmin 246 nm (ε 12800); [α]D20=+14 (c 1.03, DMSO).

1. concentrationthe mixture was concentrated to dryness
2. dissolutionThe residue was dissolved in dichloromethane (60 mL)
3. washwashed successively with water (40 mL)
4. customThe organic layer was dried
5. filtrationfiltered
6. concentrationconcentrated and co-evaporated with toluene and methanol
7. customThe residue was purified by silica gel column chromatography (0-10% MeOH in dichloromethane)

ORD-Eintrag

ord-cbadba9a26ac4ce5abeb70e5424a173c

Quelldatensatz

uspto-grants-2007_12

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US07304043B2