Multi-step reaction with 7 steps
1: 3.4 g / (+)-diethyl L-tartrate, titanium(IV) tert-butoxide, t-BuOOH / CH2Cl2 / 5.5 h / -23 °C
2: 1. oxalyl chloride, DMSO 2. NEt3 / 1. CH2Cl2, -55 deg C 2. -55 deg C up to 25 deg C
3: 77 percent / tetrahydrofuran / 0.12 h / -78 °C
4: 1. oxalyl chloride, DMSO 2. NEt3 / 1. CH2Cl2, -55 deg C, 1 h 2. -55 deg C up to 25 deg C
5: 1. LDA / 1. THF, -78 deg C, 50 min 2. -78 deg C, 10 min
6: 95 percent / 2,3-dichloro-5,6-dicyano-1,4-benzochinone / CH2Cl2; H2O / 1.5 h
7: 99 percent / tetrabutylammonium fluoride / tetrahydrofuran / 0.17 h
With
titanium(IV) tetrabutoxide; tert.-butylhydroperoxide; oxalyl dichloride; diethyl (2R,3R)-tartrate; tetrabutyl ammonium fluoride; dimethyl sulfoxide; triethylamine; 2,3-dicyano-5,6-dichloro-p-benzoquinone; lithium diisopropyl amide;
In
tetrahydrofuran; dichloromethane; water;
DOI:10.1021/jo00294a030