Multi-step reaction with 8 steps
1: 3.3 g / 0.5M NaOMe / methanol / 2 h / 20 °C
2: 2.3 g / p-TsOH*H2O / dimethylformamide / 1 h / 20 °C
3: 1.) 50percent NaH in oil / 1.DMF, 20 deg C, 30 min 2.) DMF, 1h
4: 70 percent / AcOH / methanol / 1 h / 80 °C
5: 1.)(Bu3Sn)2O 2.) Bu4NBr / 1.) toluene, reflux, 4h, 2.) toluene, 80-85 deg C, 24h
6: 100 percent / pyridine / 4 h / 20 °C
7: 93 percent / PdCl2, AcONa, AcOH / H2O / 1 h / 70 °C
8: 89 percent / SOCl2, DMF / 1,2-dichloro-ethane / 2 h / 20 °C
With
pyridine; thionyl chloride; tetrabutylammomium bromide; sodium methylate; sodium acetate; sodium hydride; toluene-4-sulfonic acid; acetic acid; N,N-dimethyl-formamide; bis(tri-n-butyltin)oxide; palladium dichloride;
In
methanol; water; 1,2-dichloro-ethane; N,N-dimethyl-formamide;
DOI:10.1016/0008-6215(87)80136-2