Multi-step reaction with 7 steps
1: n-BuLi / tetrahydrofuran; hexane / 1) -78 to 25 deg C, 30 min, 2) 3.5h, reflux
2: 99 percent / PCC, Celite / CH2Cl2 / 2 h / 25 °C
3: 93 percent / DIBAL-H / diethyl ether; hexane / 1) -78 deg C, 25 min, 2) 25 deg C, 1h
4: 1) Ti(OiPr)4, (+)-(R,R)-diethyl tartrate, mol. sieves 4 Angstroem, 2) t-BuOOH / 1) CH2Cl2, -20 deg C, 30 min, 2) CH2Cl2, -20 deg C, 3d
5: 92 percent / PCC, NaOAc, mol. sieves 4 Angstroem, Celite / CH2Cl2 / 0.5 h / 25 °C
6: mol. sieves 4 Angstroem / toluene / -78 °C
7: 87 percent / NaH / tetrahydrofuran / 12 h / 23 °C
With
titanium(IV) isopropylate; tert.-butylhydroperoxide; n-butyllithium; diethyl (2R,3R)-tartrate; 4 A molecular sieve; Celite; sodium acetate; sodium hydride; diisobutylaluminium hydride; pyridinium chlorochromate;
In
tetrahydrofuran; diethyl ether; hexane; dichloromethane; toluene;
DOI:10.1021/jo00004a053