Multi-step reaction with 11 steps
1: 99 percent / 4-methylmorpholine N-oxide / osmium tetraoxide / acetone; H2O; 2-methyl-propan-2-ol / 120 h
2: 88 percent / thionyl diimidazole / tetrahydrofuran / 0.33 h / -20 °C
3: 76 percent / 3 Angstroem molecular sieves / ytterbium(III) triflate / toluene / 12 h / 100 °C
4: 95 percent / trifluoromethane sulfonic acid / CH2Cl2; cyclohexane / 4 h / 20 °C
5: 91 percent / sodium methoxide / methanol / 12 h
6: 77 percent / p-toluenesulfonic acid / dimethylformamide / 17 h / 50 °C / reduced pressure
7: 76 percent / dibutyltin dichloride; 2,6-di-tert-butyl-4-methylpyridine; silver triflate / toluene / 0.25 h / 20 °C
8: 82 percent / p-toluenesulfonic acid monohydrate / CHCl3; methanol / 24 h / 20 °C
9: 95 percent / triethylamine; N,N-dimethylaminopyridine / CH2Cl2 / 8 h / 20 °C
10: 89 percent / triflic acid / diethyl ether / 1 h / 0 °C
11: 92 percent / potassium carbonate / methanol / 12 h / 20 °C
With
dmap; 2,6-di-tert-butyl-4-methylpyridine; trifluorormethanesulfonic acid; 3 A molecular sieve; thionyl diimidazole; dibutyltin chloride; sodium methylate; silver trifluoromethanesulfonate; potassium carbonate; toluene-4-sulfonic acid; 4-methylmorpholine N-oxide; triethylamine;
osmium(VIII) oxide; ytterbium(III) triflate;
In
tetrahydrofuran; methanol; diethyl ether; dichloromethane; chloroform; cyclohexane; water; N,N-dimethyl-formamide; acetone; toluene; tert-butyl alcohol;
1: Oxidation / 2: Cyclization / 3: glycosylation / 4: Etherification / 5: methanolysis / 6: Cyclization / 7: glycosylation / 8: solvolysis / 9: silylation / 10: glycosylation / 11: Deacetylation;
DOI:10.1016/S0040-4020(97)01024-7