Multi-step reaction with 9 steps
1: 34 percent / diphenyl disulfide / benzene / 10 h / 5 - 10 °C / Irradiation
2: mCPBA / CH2Cl2 / 0.5 h / 0 °C
3: trifluoroacetic anhydride, 2,6-lutidine / acetonitrile / 0.5 h / 0 °C
4: 1.) tert-BuOK / 1.) THF, -30 deg C, 10 min, 2.) THF, -40 deg C, 30 min
5: 97 percent / POCl3, Et3N / tetrahydrofuran / 0.5 h / -10 °C
6: NH3 / methanol / 1 h
7: 1.) KOH, 2.) Na, liq. NH3, 3.) Et3N, DMAP
8: 1.) LHMDS / 1.) THF, hexane, from 0 deg C to RT, 30 min, 2.) THF, hexane, 0 deg C, 30 min
9: 98 percent / mCPBA / CH2Cl2 / 0.5 h / 0 °C
With
2,6-dimethylpyridine; dmap; potassium hydroxide; potassium tert-butylate; ammonia; sodium; triethylamine; 3-chloro-benzenecarboperoxoic acid; diphenyldisulfane; trifluoroacetic anhydride; lithium hexamethyldisilazane; trichlorophosphate;
In
tetrahydrofuran; methanol; dichloromethane; acetonitrile; benzene;
DOI:10.1248/cpb.45.1932