合成路线： PBr3- H3C-CH-CH2Br Mg (CH3)2CHCHO H3C-CH-CH2OH CH2CI CH3 CH3 无水醚 OH H20 CrO3/Py H3C-CH-CH2-CH-CH(CH3)3 H3C-CH-CH2-C-CH(CH3)2 CH3 CH3 0 合成路线： PBr3 CH2Cl2 H3C CH CH2 C CH(CH3)2 CH3 O CH CH(CH3 ) H3C CH CH2 3 CH3 OH H3C CH CH2Br CH3 H3C CH CH2OH CH3 Mg (CH3 )2CHCHO H2O CrO3/Py 无水醚