Multi-step reaction with 7 steps
1: 82 percent / trichloroacetic acid, 3A molecular sieves / benzene / 12 h / Ambient temperature
2: 1.) thexylborane, 2.) 30percent aq. H2O2 / 1.) THF, -10 deg C, 5 h, 2.) methanol, 0 deg C, 1 h
3: 1.) oxalyl chloride, DMSO, 2.) triethylamine / 1.) CH2Cl2, -78 deg C, 30 min, 2.) CH2Cl2, from -78 deg C to RT
4: 1.) di-n-butylboryl triflate, triethylamine / 1.) CH2Cl2, -78 deg C, 1 h, 2.) CH2Cl2, a) -78 deg C, 1 h, b) 0 deg C, 1 h
5: 91 percent / (N,N-dimethylamino)pyridine / CH2Cl2 / 5 h / Ambient temperature
6: 1.) 2.4 M n-butyllithium / 1.) THF, hexane, 0 deg C, 20 min, 2.) THF, -hexane, 20 deg C, 24 h
With
dmap; n-butyllithium; oxalyl dichloride; 3 A molecular sieve; thexylborane; di-n-butylboryl trifluoromethanesulfonate; dihydrogen peroxide; dimethyl sulfoxide; triethylamine; trichloroacetic acid;
In
dichloromethane; benzene;
DOI:10.1021/ja00020a025