Multi-step reaction with 16 steps
1: 96 percent / Et3N, imidazole / CH2Cl2 / 1.5 h / Ambient temperature
2: 87 percent / CuBr / tetrahydrofuran / 1 h / 0 °C
3: 98 percent / i-Pr2NEt / CH2Cl2 / 12 h / Ambient temperature
4: 96 percent / n-Bu4NF / tetrahydrofuran / 2 h / Ambient temperature
5: pyridine / 24 h / 0 °C
6: BF3*Et2O, dimethyl sulfide / 0.17 h / 0 °C
7: aq. K2CO3 / ethanol / 0.17 h / Ambient temperature
8: 82 percent / n-BuLi / hexane / 0.17 h / Ambient temperature
9: 76 percent / i-Pr2NEt / CH2Cl2 / 15 h / Ambient temperature
10: 93 percent / sodium amalgam / ethanol / 24 h / Ambient temperature
11: n-Bu4NF / tetrahydrofuran / 2 h / Ambient temperature
12: CrO3, H2SO4 / acetone / 0.33 h / -20 °C
13: ethyl acetate / 0 °C
14: LDA / hexane; tetrahydrofuran / 1.) -78 deg C, 20 min, 2.) -78 deg C, 10 min
15: aq. CSA / methanol / 2 h / Ambient temperature
16: pyridine / 2 h
With
pyridine; 1H-imidazole; chromium(VI) oxide; sodium amalgam; n-butyllithium; dimethylsulfide; sulfuric acid; camphor-10-sulfonic acid; boron trifluoride diethyl etherate; tetrabutyl ammonium fluoride; potassium carbonate; triethylamine; N-ethyl-N,N-diisopropylamine; copper(I) bromide; lithium diisopropyl amide;
In
tetrahydrofuran; methanol; ethanol; hexane; dichloromethane; ethyl acetate; acetone;
DOI:10.1021/jo00119a019