Multi-step reaction with 10 steps
1: HBr; AcOH / CH2Cl2 / 0 - 20 °C
2: 40 percent / tetrabutylammonium hydrogensulfate; NaOH / CH2Cl2; H2O
3: 96 percent / NaOMe; MeOH / 20 °C
4: 28 percent / pyridine / -40 - 20 °C
5: 83 percent / methyl diethylaminosulfur trifluoride / CH2Cl2 / -30 - 20 °C
6: 85 percent / NaOMe; MeOH / 20 °C
7: 40 percent / 2,2,6,6-tetramethyl-1-piperidinyloxyl; tert-butyl hypochlorite; NaOH / H2O / 2.5 h / 20 °C / pH 10 - 10.5
8: 79 percent / pyridine / 1.5 h / 20 °C
9: 39 percent / N-bromosuccinimide / CCl4 / 1 h / Heating; irradiation
10: 5 percent / tributyltin deuteride / toluene / 1.5 h / Heating
With
pyridine; methanol; sodium hydroxide; N-Bromosuccinimide; 2,2,6,6-Tetramethyl-1-piperidinyloxy free radical; tert-butylhypochlorite; methyl diethylaminosulfur trifluoride; hydrogen bromide; sodium methylate; tetra(n-butyl)ammonium hydrogensulfate; tributyltin deuteride; acetic acid;
In
tetrachloromethane; dichloromethane; water; toluene;
2: Koenigs-Knorr reaction / 3: Zemplen deacetylation / 6: Zemplen deacetylation;
DOI:10.1021/ja020627c