Multi-step reaction with 12 steps
1: 98 percent / imidazole / dimethylformamide / 12 h / 25 °C
3: 99 percent / imidazole / dimethylformamide / 25 °C
4: 1.) sec-BuLi / 1.) THF, hexane, -78 degC, 1 h, 2.a) 1h, -78 degC, 2a.) 25 degC, 2 h
5: 93 percent / KF / dimethylformamide / 3 h / 25 °C
6: 44 percent / NaOMe / methanol; tetrahydrofuran / 1.) -10 degC, 3 h, 2.) -10 -> 25 degC
7: 94 percent / xylene / 3 h / Heating
8: LiAlH4 / tetrahydrofuran / 1 h / 25 °C
9: 85 percent / MnO2 / CH2Cl2 / 1.5 h / 25 °C
10: 1.) Ph2P(CH2)3PPh2 / 1.) (Ph3P)2Rh(I)(CO)2Cl / 1.) mesitylen, 100 degC, 1h, 2.) reflux, 20 h
11: HOAc / ethanol; H2O / 1.) 0-5 degC, 2 h, 2.) 25 degC, 20 h
12: ethanol; ethyl acetate / 24 h / refrigerated
With
1H-imidazole; manganese(IV) oxide; potassium fluoride; lithium aluminium tetrahydride; 1,3-bis-(diphenylphosphino)propane; sec.-butyllithium; sodium methylate; acetic acid;
(Ph3P)2Rh(I)(CO)2Cl;
In
tetrahydrofuran; methanol; ethanol; dichloromethane; water; ethyl acetate; N,N-dimethyl-formamide; xylene;
DOI:10.1248/cpb.38.2939