Multi-step reaction with 6 steps
1: 1.) DMSO, (COCl)2, 2.) Et3N / 1.) CH2Cl2, 20 min, 2.) CH2Cl2, from -78 to -60 deg C, 20 min
2: 1.) PPh3 / 1.) CH2Cl2, 0 deg C, 10 min, 2.) CH2Cl2, -78 deg C, 20 min
3: 1.) N-BuLi / 1.) n-hexane, THF, -78 deg C, 1 h, 2.) n-hexane, THF, from -78 deg C, 30 min to RT, 1 h
4: 90 percent / H2, quinoline / 5percent Pd/BaSO4 / ethyl acetate / 0.25 h
5: 98 percent / 1N aq. HCl / methanol / 2 h / Ambient temperature
6: 96 percent / imidazole / CH2Cl2 / 1 h / Ambient temperature
With
1H-imidazole; quinoline; hydrogenchloride; n-butyllithium; oxalyl dichloride; hydrogen; dimethyl sulfoxide; triethylamine; triphenylphosphine;
Pd-BaSO4;
In
methanol; dichloromethane; ethyl acetate;
DOI:10.1248/cpb.45.1558