Multi-step reaction with 22 steps
1: DIBAL
2: 99 percent / NBS / CH2Cl2 / 0 °C
3: 87 percent / diphenyl ether / Heating
4: 75 percent / LDA / tetrahydrofuran / -78 °C
5: 66 percent / DMSO / CH2Cl2 / Heating
6: 94 percent / tetrahydrofuran / -20 °C
7: p-TsOH
8: 90 percent / Li(Et)3BH / tetrahydrofuran
9: 87 percent / NaH / tetrahydrofuran
10: 85 percent / Zn; acetic acid / ethanol / Heating
11: 91 percent / NaHCO3 / diphenyl ether / Heating
12: 93 percent / NH2NH2*H2O; K2CO3; TEG / 250 °C
13: Ph3P; DIAD / CH2Cl2 / 20 °C
14: aq. NaOH / methanol / 20 °C
15: 81 percent / MnO2 / CH2Cl2 / 20 °C
16: 67 percent / t-BuOK; HMPA / tetrahydrofuran / -25 °C
17: 89 percent / CuBr-Me2S
18: H2 / 10percent Pd/C
19: Bu3P
20: m-CPBA / -78 °C
21: CaCO3 / diphenyl ether / Heating
With
N,N,N,N,N,N-hexamethylphosphoric triamide; manganese(IV) oxide; sodium hydroxide; N-Bromosuccinimide; tributylphosphine; di-isopropyl azodicarboxylate; potassium tert-butylate; hydrogen; sodium hydride; diisobutylaluminium hydride; lithium triethylborohydride; sodium hydrogencarbonate; potassium carbonate; toluene-4-sulfonic acid; hydrazine hydrate; acetic acid; dimethyl sulfoxide; 3-chloro-benzenecarboperoxoic acid; triphenylphosphine; calcium carbonate; zinc; lithium diisopropyl amide; 2,2'-[1,2-ethanediylbis(oxy)]bisethanol;
10percent Pd/C;
In
tetrahydrofuran; methanol; diphenylether; ethanol; dichloromethane;
3: Eschenmoser rearrangement / 5: Pauson-Khand reaction / 11: retro-Diels-Alder reaction / 12: Wolff-Kishner reaction;
DOI:10.1021/ol006922o