Pyridine → HCID 88236211, Verbindung

Trifluoromethanesulfonic anhydride (1.8 mL, 10.8 mmol) is added at 0° C. to a solution of phenyl 6-deoxy-2-O-(4-methoxybenzyl)-1-thio-β-L-allopyranoside (β-14) (1.01 g, 2.69 mmol) and pyridine (2.2 mL, 26.9 mmol) in 30 mL of CH2Cl2. The solution is stirred at 0° C. for 1 h and allowed to warm at room temperature over 3 h. The reaction mixture is cooled to 0° C. before quenching with TEA (1.0 mL, 7.2 mmol). The reaction mixture is diluted with 30 mL of CH2Cl2, washed with saturated NaHCO3 (30 mL), 1N HCl (30 mL), dried over Na2SO4, filtered and concentrated. The crude product is purified by flash chromatography (8% EtOAc/petroleum ether) to give 1.36 g (79%) of phenyl 6-deoxy-3,4-di-O-(trifluoromethanesulfonyl)-2-O-(4-methoxybenzyl)-1-thio-β-L-allopyranoside (β-15): Rf 0.49 (20% EtOAc/petroleum ether); 1H NMR (CDCl3, 270 MHz) δ 7.48 (d, 2H, ArH), 7.33-7.21 (m, SH, ArH), 6.91 (d, 2H, ArH), 5.34 (t, J=2.0 Hz, 1H, H-3), 4.93 (d, J=9.2 Hz, 1H, H-1), 4.77 (d, J=11.2 Hz, 1H, CH2), 4.65 (d, J=11.2 Hz, 1H, CH2), 4.55 (dd, J=2.0, 8.8 Hz, 1H, H-4), 4.19-3.96 (m, 1H, H-5), 3.90 (s, 3H, OCH3), 3.47 (dd, J=2.0, 9.2 Hz, 1H, H-2), 1.36 (d, J=5.8 Hz, 3H, H-6).

1. temperatureto warm at room temperature over 3 h
2. temperatureThe reaction mixture is cooled to 0° C.
3. washwashed with saturated NaHCO3 (30 mL), 1N HCl (30 mL)
4. dry with materialdried over Na2SO4
5. filtrationfiltered
6. concentrationconcentrated
7. customThe crude product is purified by flash chromatography (8% EtOAc/petroleum ether)

ORD-Eintrag

ord-94164d4714a54394b5ff776c23d2a257

Quelldatensatz

uspto-grants-2000_03

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US06040433