Multi-step reaction with 5 steps
1: 77 percent / K2CO3 / acetonitrile / 5 h / Heating
2: 1.) DMSO, oxalyl chloride, 2.) triethylamine / 1.) CH2Cl2, -78 deg C, 1 h, 2.) CH2Cl2, 25 deg C, 2 h
3: 1.) n-BuLi / 1.) THF, hexane, -78 deg C, 2 h, 2.) THF, hexane, from -78 deg C to 25 deg C, 5 h
4: 90 percent / Red-Al / tetrahydrofuran; toluene / 38 °C
5: 1.) oxalyl chloride, 2.) triethylamine / 1.) CH2Cl2, -78 deg C, 2 h, 2.) CH2Cl2, 25 deg C, 2 h
With
n-butyllithium; oxalyl dichloride; potassium carbonate; dimethyl sulfoxide; triethylamine; sodium bis(2-methoxyethoxy)aluminium dihydride;
In
tetrahydrofuran; toluene; acetonitrile;
DOI:10.1016/0040-4020(95)01105-6