Multi-step reaction with 6 steps
1: 45 percent / CBr4, Ph3P / tetrahydrofuran / 0.5 h / Ambient temperature
2: 91 percent / pyridinium p-toluenesulfonate (PPTS) / CH2Cl2 / 12 h / Ambient temperature
3: 1.) KH / 1.) DMF, 0 deg C, 2.) DMF, RT, 6h
4: 100 percent / camphorsulfonic acid (CSA) / methanol; CH2Cl2 / 5 h / Ambient temperature
5: 96 percent / (COCl)2, DMSO, Et3N / CH2Cl2 / 2 h / -78 °C
6: 1.) n-BuLi / 1.) hexane, THF, 0 deg C, 20 min, 2.) THF, hexane, 0 deg C, 30 min
With
n-butyllithium; oxalyl dichloride; carbon tetrabromide; camphor-10-sulfonic acid; pyridinium p-toluenesulfonate; potassium hydride; dimethyl sulfoxide; triethylamine; triphenylphosphine;
In
tetrahydrofuran; methanol; dichloromethane;
DOI:10.1248/cpb.41.16