Multi-step reaction with 9 steps
1: 76 percent / oxalyl chloride; dimethylsulfoxide; triethylamine / CH2Cl2 / 2 h / -78 - 0 °C
2: 80 percent / BuLi / tetrahydrofuran; hexane / 0.5 h / -78 °C
3: 1.8-diazabicyclo[5.4.0]undec-7-ene / dimethylsulfoxide / 3 h / 0 °C
4: NaN3; 15-crown-5; hexamethylphosphoric triamide / 17 h / 70 °C
5: 30.7 g / NaBH4 / methanol / 1.5 h / 0 °C
6: imidazole / dimethylformamide / 17 h / 20 - 60 °C
7: 15.8 g / camphorsulfonic acid / methanol; tetrahydrofuran / 26 h / 20 °C
8: imidazole / dimethylformamide / 2 h / 0 °C
9: 13.9 g / NaH / dimethylformamide / 5 h / -23 °C
With
1H-imidazole; N,N,N,N,N,N-hexamethylphosphoric triamide; sodium tetrahydroborate; n-butyllithium; sodium azide; oxalyl dichloride; 15-crown-5; camphor-10-sulfonic acid; sodium hydride; dimethyl sulfoxide; 1,8-diazabicyclo[5.4.0]undec-7-ene; triethylamine;
In
tetrahydrofuran; methanol; hexane; dichloromethane; dimethyl sulfoxide; N,N-dimethyl-formamide;
1: Swern oxidation;
DOI:10.1016/S0040-4020(02)01058-X