Multi-step reaction with 6 steps
1: 1.) n-BuLi / 1.) THF, hexane, -78 deg C, 25 min, 2.) THF, hexane, from -78 deg C to RT
2: 59 percent / LDA / tetrahydrofuran; hexane / -78 - 20 °C
3: 1.) aq. H2O2, LiOH, 2.) NaNO2 / 1.) THF, RT, 1.5 h, 2.) THF, 30 min
4: 91.8 percent / HOBT, 1-<3-(dimethylamino)propyl>-3-ethylcarbodiimide hydrochloride / dimethylformamide / Ambient temperature
5: 79.6 percent / 90 percent aq. TFA / 1 h
6: 85 percent / HOBT*H20, 1-<3-(dimethylamino)propyl>-3-ethylcarbodiimide hydrochloride, Et3N / dimethylformamide / Ambient temperature
With
lithium hydroxide; n-butyllithium; dihydrogen peroxide; benzotriazol-1-ol; 1-ethyl-(3-(3-dimethylamino)propyl)-carbodiimide hydrochloride; triethylamine; trifluoroacetic acid; lithium diisopropyl amide; sodium nitrite;
In
tetrahydrofuran; hexane; N,N-dimethyl-formamide;
DOI:10.1021/jm970404a