Multi-step reaction with 8 steps
1: 1) n-BuLi / 1) THF, hexane, -78 deg C, 1 h, 2) room temp., 0.5 h
2: 1) oxalyl chloride, DMSO, 2) Et3N / 1) CH2Cl2. -78 deg C, 30 min, 2) 0 deg C, 15 min
3: 61 percent / EtAlCl2 / CH2Cl2; hexane / 0.83 h / -78 °C
4: 1) oxalyl chloride, DMSO, 2) Et3N / 1) CH2Cl2, -78 deg C, 30 min, 2) 0 deg C, 15 min
5: 79 percent / L-Selectride / tetrahydrofuran / 1 h / -78 °C
6: 81 percent / triphenylphosphine, diisopropyl azodicarboxylate / benzene / 5 h
7: 84 percent / TBAF / tetrahydrofuran / 1 h / Ambient temperature
8: 86 percent / imidazole / dimethylformamide / 14 h / Ambient temperature
With
1H-imidazole; n-butyllithium; oxalyl dichloride; di-isopropyl azodicarboxylate; tetrabutyl ammonium fluoride; ethylaluminum dichloride; L-Selectride; dimethyl sulfoxide; triethylamine; triphenylphosphine;
In
tetrahydrofuran; hexane; dichloromethane; N,N-dimethyl-formamide; benzene;
DOI:10.1021/jo00067a024