Multi-step reaction with 10 steps
1: 86 percent / 4 Angstroem mol. sieves, (L)+diisopropyl tartarate, Ti(i-PrO)4, t-BuOOH / CH2Cl2 / 1 h / -15 - -5 °C
2: 90 percent / CHCl3 / 3 h / -20 - 0 °C
3: 94 percent / imidazole / tetrahydrofuran / 24 h / Ambient temperature
4: 83 percent / K2CO3 / H2O; methanol / 2 h / Ambient temperature
5: 91 percent / p-TsOH / CH2Cl2 / 12 h / Ambient temperature
6: 94 percent / TBAF / tetrahydrofuran / 2 h / Ambient temperature
7: (COCl)2, DMSO, Et3N / CH2Cl2 / 1 h / -78 - -20 °C
8: 74 percent / n-BuLi / tetrahydrofuran / 2 h / -78 - -40 °C
9: 86 percent / TBHP, VO(acac) / CH2Cl2 / 10 h / 0 °C
10: 1.) CrO3; 2.) NaBH(OAc)3 / 1.) AcOH, 15 min, 30 deg C; 2.) IPA/AcOH, -10 deg C, 1 h
With
1H-imidazole; chromium(VI) oxide; titanium(IV) isopropylate; tert.-butylhydroperoxide; n-butyllithium; oxalyl dichloride; bis(acetylacetonate)oxovanadium; L-(+)-diisopropyl tartrate; 4 A molecular sieve; tetrabutyl ammonium fluoride; sodium tris(acetoxy)borohydride; potassium carbonate; toluene-4-sulfonic acid; dimethyl sulfoxide; triethylamine;
In
tetrahydrofuran; methanol; dichloromethane; chloroform; water;
DOI:10.1016/0040-4020(94)01025-U