Multi-step reaction with 7 steps
1: 79 percent / 2,6-lutidine / CH2Cl2 / 5 °C
2: 92 percent / H2 / Pd/C / ethyl acetate / 2 h / 760 Torr
3: 72 percent / 2(OAc)>4 / CH2Cl2 / 6 h / Ambient temperature
4: 60 percent / potassium tert-butoxide / 2 h / -20 deg C -> room temperature
5: 55 percent / tetrabutylammonium fluoride, glacial acetic acid / tetrahydrofuran / 2 h / Ambient temperature
6: 90 percent / oxalyl chloride, DMSO / CH2Cl2 / 1.) -60 deg C, 30 min, 2.) -20 deg C, 2 h
7: 1.) Et3N, 2.) P(OEt)3, hydroquinone / 1.) xylene, 0 deg C, 30 min, 2.) xylene, 120 deg C, 4 h
With
2,6-dimethylpyridine; dirhodium tetraacetate; oxalyl dichloride; potassium tert-butylate; tetrabutyl ammonium fluoride; hydrogen; acetic acid; dimethyl sulfoxide; triethylamine; hydroquinone; triethyl phosphite;
palladium on activated charcoal;
In
tetrahydrofuran; dichloromethane; ethyl acetate;
DOI:10.1016/S0040-4020(97)01053-3