Multi-step reaction with 5 steps
1: 95 percent / ethyldiisopropylamine, 4-(dimethylamino)pyridine / CH2Cl2
2: 1.) O3, 2.) Me2S / 1.) CH2Cl2, -78 deg C, 2.) CH2Cl2, t-BuOH, RT, overnight
3: 1.) (t-Buo)3Al, T-BuOK / 1.) THF, t-BuOH, 0 deg C, 10 min, 2.) THF, t-BuOH a) 0 deg C, 3 h, b) -20 deg C, overnight
4: 64 percent / MeSO2Cl, ethyldiisopropylamine / CH2Cl2 / 0.25 h / -78 °C
5: 1.) Bu4NF, 2.) O3 / 1.) THF, -55 deg C, 15 min, 2.) THF, CH2Cl2, -78 deg C
With
dmap; dimethylsulfide; potassium tert-butylate; tetrabutyl ammonium fluoride; aluminum tri-tert-butoxide; ozone; methanesulfonyl chloride; N-ethyl-N,N-diisopropylamine;
In
dichloromethane;
DOI:10.1021/jo00230a008