Multi-step reaction with 11 steps
1: 1) magnesium, dibromoethane / 1) THF, reflux, 2) 2 h, 0 deg C
2: 3.7 g / 30percent H2O2, NaHCO3 / methanol; tetrahydrofuran / 15 h / Heating
3: pyridine / 0 deg C to r. t., overnight
4: 0.41 g / pyridine, 4-dimethylaminopyridine / 0.5 h
5: 82 percent / H2 / 10percent Pd-C / ethyl acetate / 24 h / 3000.2 Torr
6: p-toluenesulfonic acid / acetonitrile / 0.5 h / Ambient temperature
7: pyridine, 4-dimethylaminopyridine / acetonitrile / 1 h
8: 0.58 g / 90percent aq. trifluoroacetic acid / acetonitrile / 0.5 h
9: halide-assisted
10: 92 percent / aq. 70percent acetic acid / 36 h / Ambient temperature
11: 70 percent / silver trifluoromethanesulfonate, 2,4,6-trimethylpyridine, 4 Angstroem molecular sieves / toluene; CH2Cl2 / Ambient temperature
With
pyridine; 2,4,6-trimethyl-pyridine; dmap; 1,1-Dibromoethane; 4 A molecular sieve; hydrogen; dihydrogen peroxide; silver trifluoromethanesulfonate; sodium hydrogencarbonate; toluene-4-sulfonic acid; magnesium; acetic acid; trifluoroacetic acid;
palladium on activated charcoal;
In
tetrahydrofuran; methanol; dichloromethane; ethyl acetate; toluene; acetonitrile;
DOI:10.1016/0008-6215(90)80133-N