Multi-step reaction with 7 steps
1: 1.) n-BuLi, HMPA, 2.) NBS, aq. NaHCO3 / 1.) THF
2: 1.) LDA, 2.) TMEDA / 1.) THF, from -45 to -20 deg C, 1.5 h, 2.) THF, from -45 to -20 deg C, 3 h
3: aq. NaOH / methanol
4: BOP, i-Pr2NEt / dimethylformamide
5: 67 percent / NaH / dimethylformamide / 0 °C
6: 100 percent / HCl / dioxane
7: 1.) DBU / 1.) DMF, 2.) DMF
With
hydrogenchloride; N,N,N,N,N,N-hexamethylphosphoric triamide; sodium hydroxide; N-Bromosuccinimide; n-butyllithium; N,N,N,N,-tetramethylethylenediamine; sodium hydride; sodium hydrogencarbonate; (benzotriazo-1-yloxy)tris(dimethylamino)phosphonium hexafluorophosphate; 1,8-diazabicyclo[5.4.0]undec-7-ene; N-ethyl-N,N-diisopropylamine; lithium diisopropyl amide;
In
1,4-dioxane; methanol; N,N-dimethyl-formamide;
DOI:10.1016/S0960-894X(99)00215-2