Multi-step reaction with 9 steps
1.1: oxalyl chloride; triethylamine; DMSO / CH2Cl2 / 0.5 h / 20 °C
1.2: 75 percent / n-BuLi / CH2Cl2; hexane; tetrahydrofuran / 2 h / 20 °C
2.1: 74 percent / pyridinium chlorochromate; silica gel / CH2Cl2 / 6 h / 45 °C
3.1: 83 percent / methanol / 3 h / 20 °C / pH 9 - 10
4.1: 75 percent / trimethylsilyl trifluoromethanesulfonate / CH2Cl2 / 3 h
5.1: LiOH*H2O / tetrahydrofuran; methanol; H2O / 12 h / 20 °C
6.1: triethylamine / tetrahydrofuran / 1 h / 20 °C
6.2: 400 mg / DMAP / tetrahydrofuran / 18 h / 20 °C
7.1: 83 percent / tetrabutylammonium fluoride / tetrahydrofuran / 4.5 h / 0 - 20 °C
8.1: 95 percent / pyridine; DMAP / 3 h / 20 °C
9.1: 90 percent / 2,3-dichloro-5,6-dicyano-1,4-benzoquinone / CH2Cl2; H2O / 2 h / 20 °C
With
pyridine; dmap; lithium hydroxide; oxalyl dichloride; trimethylsilyl trifluoromethanesulfonate; tetrabutyl ammonium fluoride; silica gel; dimethyl sulfoxide; triethylamine; pyridinium chlorochromate; 2,3-dicyano-5,6-dichloro-p-benzoquinone;
In
tetrahydrofuran; methanol; dichloromethane; water;
1.1: Swern oxidation / 1.2: Wittig reaction;
DOI:10.1021/jo0615504