(-)-sparteine in diethyl ether; cyclohexane addn. of soln. of s-BuLi in cyclohexane to a soln. of (-)-sparteine in ether at -78 °C under Ar, stirring for 10 min at -78 °C, addn. of Fe(C5H4CON(i-Pr)2)2 in ether, stirring for 2 h at -78 °C, addn. of Ph2PCl; addn. of aq. NH4Cl, extracton with CH2Cl2, concn. under reduced pressure, chromatography on silica gel deactivated with Et3N (EtOAc-hexane 1:6);