Multi-step reaction with 14 steps
1.1: 100 percent / acetyl chloride / 3.3 h / 20 °C
2.1: 83 percent / imidazole / dimethylformamide / 0.5 h / 20 °C
3.1: 83 percent / NaBH4 / tetrahydrofuran; methanol / Heating
4.1: 96 percent / iodine; imidazole; triphenylphosphine / CH2Cl2 / 20 °C
5.1: 95 percent / dimethylsulfoxide; tetrahydrofuran / 2 h / 60 °C
6.1: 1.52 kg / HCl / 1 h / Heating
7.1: N-bromosuccinimide; HBr / 2-methyl-propan-2-ol; H2O / 0.5 h / 20 °C
7.2: 46 percent / DDQ / ethyl acetate / 3.5 h / Heating
8.1: tert-BuOK / various solvent(s); tetrahydrofuran / 2 h / 0 °C
9.1: 240 mg / methanol; tetrahydrofuran; hexane / 4.5 h / 20 °C
10.1: 90 percent / NaBH4 / methanol; tetrahydrofuran / 1.5 h / 0 °C
11.1: 96 percent / N,N-dimethylaminopyridine; pyridine / 3 h / 20 °C
12.1: N-bromosuccinimide; 2,2'-azobisisobutyronitrile / hexane / 0.5 h / Heating
13.1: γ-collidine / toluene / 1 h / Heating
14.1: 9.06 g / CH2Cl2 / 15 h / 20 °C
With
pyridine; 1H-imidazole; 2,4,6-trimethyl-pyridine; hydrogenchloride; dmap; sodium tetrahydroborate; N-Bromosuccinimide; 2,2'-azobis(isobutyronitrile); potassium tert-butylate; hydrogen bromide; iodine; acetyl chloride; triphenylphosphine;
In
tetrahydrofuran; methanol; hexane; dichloromethane; water; dimethyl sulfoxide; N,N-dimethyl-formamide; toluene; tert-butyl alcohol;
1.1: Methylation / 2.1: silylation / 3.1: Reduction / 4.1: Iodination / 5.1: Substitution / 6.1: Addition / 7.1: Bromination / 7.2: Oxidation / 8.1: Isomerization / 9.1: Methylation / 10.1: Reduction / 11.1: Acetylation / 12.1: Bromination / 13.1: Dehydrobromination / 14.1: Cycloaddition;
DOI:10.1016/S0968-0896(98)80025-4