1: 1.) dibutylstannoxane; 2.) triethylamine / 1.) methanol, reflux, 1 h; 2.) methanol, 20 deg C, 2 h 2: 1.) CF3COOH; 2.) NaIO4; 3.) MeONa 3: 82 percent / 20 percent Pd(OH)2/C / ethanol; cyclohexene / 2.5 h / Heating 4: 90 percent / 4-dimethylaminopyridine / pyridine / 16 h / 20 °C 5: 1.) hexamethyldisilazane; 2.) CF3SO2SiMe3 / 1.) pyridine, reflux, 4 h; 2.) 1,2-dichloroethane, 20 deg C, 16 h 6: 72 percent / ammonia / methanol / 48 h / 20 °C View Scheme