Multi-step reaction with 8 steps
1.1: n-BuLi / tetrahydrofuran; hexane / -78 - -40 °C
1.2: 87 percent / tetrahydrofuran; hexane / 1 h / -78 - -40 °C
2.1: 95 percent / MnO2 / CH2Cl2 / 19 h
3.1: (R)-CBS; BH3 / tetrahydrofuran / 1.25 h / -78 - -40 °C
4.1: 96 percent / ethyldiisopropylamine / CH2Cl2 / 8.5 h / 0 - 20 °C
5.1: O3 / hexane / 0.25 h / -78 °C
5.2: PPh3 / hexane; diethyl ether / -78 - 20 °C
6.1: BuLi / hexane; diethyl ether / 4 h / 0 °C
6.2: 85 percent / diethyl ether; hexane / 0 °C
7.1: 31 percent / N,N-bis-(benzylidene)ethylenediamine / Pd(OAc)2 / CH2Cl2 / 72 h / 60 °C
8.1: 88 percent / TBAF / tetrahydrofuran / 4 h / 20 °C
With
manganese(IV) oxide; n-butyllithium; N,N'-bis(benzyliden)ethylendiamine; borane; tetrabutyl ammonium fluoride; ozone; N-ethyl-N,N-diisopropylamine; (R)-(+)-2-methyl-CBS-oxazaborolidine;
palladium diacetate;
In
tetrahydrofuran; diethyl ether; hexane; dichloromethane;
6.2: Wittig reaction;
DOI:10.1016/j.tet.2005.11.096