Multi-step reaction with 19 steps
1: 77 percent / NaOMe / methanol / 25 deg C -> reflux
2: 1.) NaBH4, 2.) diisobutylaluminum hydride / 1.) methanol, -55 deg C; 2.) toluene, -78 deg C
3: pyridine / CH2Cl2 / 25 °C
4: HMPA / 25 °C
5: 1.) aq. NaOH / 1.) reflux
6: H2 / Lindlar catalyst
7: pyridine / CH2Cl2 / 0 °C
8: Et3N / -20 °C
9: 1.) NaOMe, MeOH, 2.) Collins reagent, 3.) DBU
10: HMPA, TMEDA / tetrahydrofuran / -78 °C
11: Collins reagent / -20 °C
12: 5 percent / H2S, NaOAc / ethanol / Heating
13: 78 percent / diisopropylethylamine / dimethylformamide / 25 °C
14: NaBH4 / ethanol / 0 °C
15: p-toluenesulfonic acid / acetone / 0 °C
16: diethyl ether / 25 °C
18: NaBH4
With
pyridine; methanol; N,N,N,N,N,N-hexamethylphosphoric triamide; sodium hydroxide; sodium tetrahydroborate; N,N,N,N,-tetramethylethylenediamine; Collins oxidation agent; hydrogen sulfide; hydrogen; sodium methylate; sodium acetate; diisobutylaluminium hydride; toluene-4-sulfonic acid; 1,8-diazabicyclo[5.4.0]undec-7-ene; triethylamine; N-ethyl-N,N-diisopropylamine;
Lindlar's catalyst;
In
tetrahydrofuran; methanol; diethyl ether; ethanol; dichloromethane; N,N-dimethyl-formamide; acetone;
DOI:10.1021/ja00405a059